RADVISION Ltd.
July 2009
Managed Objects for Time Division Multiplexing (TDM)
over Packet Switched Networks (PSNs)
Abstract
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This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects for pseudowire encapsulation for structured or unstructured Time-Division Multiplexing (TDM) (T1, E1, T3, E3) circuits over a Packet Switched Network (PSN).
Status of This Memo
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This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
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Copyright © 2009 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document.
This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English.
Table of Contents
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1. Introduction ....................................................2 2. Conventions .....................................................3 3. Terminology .....................................................3 4. The Internet-Standard Management Framework ......................4 5. Overview ........................................................4 6. TDM MIB Module Usage ............................................4 6.1. Structure of TDM MIB .......................................4 6.2. TDM Connection Configuration Procedure .....................5 6.3. TDM PW Monitoring ..........................................6 7. Example of Actual TDM PW Setup ..................................6 8. Object Definition ...............................................9 9. Security Considerations ........................................37 10. IANA Considerations ...........................................39 11. References ....................................................39 11.1. Normative References .....................................39 11.2. Informative References ...................................40 12. Acknowledgements ..............................................41
1. Introduction
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This document describes a model for managing TDM pseudowires, i.e., TDM data encapsulated for transmission over a Packet Switched Network (PSN). The term TDM in this document is limited to the scope of Plesiochronous Digital Hierarchy (PDH). It is currently specified to carry any TDM Signals in either Structure Agnostic Transport mode (E1, T1, E3, and T3) or in Structure Aware Transport mode (E1, T1, and NxDS0) as defined in the Pseudowire Emulation Edge-to-Edge (PWE3) TDM Requirements document [RFC4197].
This document is closely related to [SATOP], [TDMOIP], and [CESOPSN], which describe the encapsulation of TDM signals and provide the Circuit Emulation Service over a PSN.
The TDM management model consists of several MIB modules, following the layering model described in the PWE3 Architecture document [RFC3985]. The TDM MIB module described in this document works closely with the MIB modules described in [DS3MIB], [DS1MIB], [DS0MIB], [IFMIB], [PWMIB], and with the textual conventions defined in [PWTC]. The conceptual layering and relationship among all those is described in Figure 1 below. A TDM connection will be a pseudowire (PW) connection. It will not be treated as an interface and will therefore not be represented in the ifTable.
Figure 1: Conceptual Layering
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+-------------------+ | TDM MIB | DS1MIB, DS3MIB, +-------------------+ DS0MIB | +-------------------+ PW-TDM-MIB, Service | TDM PW MIB | PW-CESOPSN-MIB, Layer +-------------------+ PW-TDMOIP-MIB - - - - - - - - - - - | - - - - - - - - - - - - - - - Generic +-------------------+ PW | Generic PW MIBS | PW-TC-MIB, Layer +-------------------+ PW-MIB - - - - - - - - - - - -| - - - - - - - - - - - - - - - +-------------------+ PSN VC | MPLS VC MIBS | PW-MPLS-MIB Layer +-------------------+ - - - - - - - - - - - -| - - - - - - - - - - - - - - - +-------------------+ PSN | MPLS MIBs | MPLS-TE-STD-MIB, Layer +-------------------+ MPLS-LSR-STD-MIB
2. Conventions
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [BCP14].
3. Terminology
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The basic terminology used to refer to transmission direction in this document is taken from [SATOP], which describes a mechanism for transporting Structure-Agnostic (TDM) bit-streams over a packet- oriented network. To simplify this document, the terminology is used for structured and unstructured TDM as well.
"PSN-bound" references the traffic direction where TDM data is received, adapted to the packet based on the number of payload bytes per packet, assigned a relevant TDM header (sequence numbers, flags, and timestamps (if the RTP header is used)), prepended multiplexing layer and PSN headers, and sent into the PSN.
Conversely, the "CE-bound" references the traffic direction where packets are received from the PSN, packet payloads are reassembled by including a jitter buffer where payload of the received TDM packets is stored prior to play out to the TDM line. The size of this buffer SHOULD be locally configurable to allow accommodation to the PSN- specific packet delay variation.
The CE-bound TDM interworking function (IWF) SHOULD use the sequence number in the control word for the detection of lost (Loss of Packet State (LOPS)) and mis-ordered packets. If the RTP header is used, the RTP sequence numbers MAY be used for the same purposes.
4. The Internet-Standard Management Framework
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For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410].
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580].
5. Overview
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This MIB module is designed to satisfy the following requirements and constraints:
- Fit within the architecture defined by [RFC3985] and [PWMIB].
- Support edge-to-edge emulation of any TDM connections.
- Configure the connection. The connection-specific behavior is provided via the supplement MIB modules.
- Report various alarms, counters, and status objects.
6. TDM MIB Module Usage
6.1. Structure of TDM MIB
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The MIB consists of five tables;
- The TDM PW Table (pwTDMTable) contains generic TDM information regarding the PW connection. It contains the ifIndex of the TDM interface, an index to an entry in the generic configuration table
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(pwTDMCfgTable), an index to an entry in the specific configuration table (pwCXXXCfgTable, where XXX can be TDMoIP (TDM over IP) or CESoPSN (Circuit Emulation Service over PSN)), config error indications, and various status indications. The two indices of the two configuration tables are providing the connection parameters. The TDM interface can be a full link of any TDM type like E1 or DS3, for example, or the interface of the bundle holding the collection of time slots to be transmitted. Based on the TDM PW type, the relevant pwXXXCfgTable from the relevant MIB module will be used. The specific types are:
- 17 Structure-agnostic E1 over Packet
- 18 Structure-agnostic T1 (DS1) over Packet
- 19 Structure-agnostic E3 over Packet
- 20 Structure-agnostic T3 (DS3) over Packet
- 21 CESoPSN basic mode (XXX=CESoPSN)
- 22 TDMoIP AAL1mode (XXX=TDMoIP)
- 23 CESoPSN TDM with CAS (XXX=CESoPSN)
- 24 TDMoIP AAL2 Mode (XXX=TDMoIP)
- The TDM Generic Parameter Table (pwTDMCfgTable) contains TDM generic configurable parameters for any TDM type.
- The TDM Performance Current Table (pwTDMPerfCurrentTable) contains TDM statistics for the current 15-minute period.
- The TDM Performance Interval Table (pwTDMPerfIntervalTable) contains TDM statistics for historical intervals (usually 96 15- minute entries to cover a 24 hour period).
- The TDM Performance One-Day Interval Table (pwTDMPerf1DayIntervalTable) contains TDM statistics for historical intervals accumulated per day. Usually 30 one-day entries to cover a monthly period.
6.2. TDM Connection Configuration Procedure
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Configuring a TDM PW involves the following steps:
First, configure the parameters of the interface-specific layer using the DS1-MIB and or the DS3-MIB.
Next, if applicable, create a bundle of time slots using the DS0 Bundle MIB [DS0MIB].
Next, create an entry in the pwTable and configure the PSN tunnels:
- Follow steps as defined in [PWMIB].
NOTE: The agent should create an entry in the pwTDMTable for any entry created in the pwTable with pwType equal to a value between (17) and (24).
Next complete the TDM PW configuration:
- If necessary, create an entry in the relevant pwXXXCfgTable and in the pwTDMTable (suitable entries may already exist in both tables).
- Set the index of the relevant pwXXXCfgTable entry and of the relevant pwTDMCfgTable entry in the pwTDMTable.
6.3. TDM PW Monitoring
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Upon making the TDM PW operational, the pwTDMPerfCurrentTable, pwTDMPerfIntervalTable, and PwTDMPerf1DayIntervalTable can be used to monitor the various counters, indicators, and conditions of the PW. All performance parameters are accumulated in daily intervals and in 15-minute intervals. The number of daily intervals kept by the agent is based on the specific implementation. The 15-minute intervals, up to 96 intervals (24 hours worth), are all kept by the agent. Fewer than 96 intervals of data will be available if the agent has been restarted within the last 24 hours. Performance parameters continue to be collected when the interface is down. There is no requirement for an agent to ensure a fixed relationship between the start of a 15-minute interval and any wall clock; however, some agents may align the 15-minute intervals with quarter hours. Performance parameters are of types PerfCurrentCount and PerfIntervalCount. These textual conventions are all Gauge32, and they are used because it is possible for these objects to decrease.
7. Example of Actual TDM PW Setup
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This section provides an example of using the various MIB objects described in the following section to set up a TDM PW connection.
The first example is setting a connection of DS1 type. The second example is setting a connection with a bandwidth of 3 DS0 (time slots).
While those examples are not meant to illustrate all options of the MIB, they are intended as an aid to understanding some of the key concepts. See [PWMIB] for an example of setting up PSN tunnels.
First example:
- Configure the DS1 interface using DS1-MIB.
- If needed, create an entry in the pwTDMCfgTable (assuming index = 10); verify that there are no errors in the configuration using the relevant object.
- Get a new pwIndexNext [PWMIB] and create a new pwTable entry using the value of pwIndexNext (assume here, the PW index = 20).
- Set the pwType [PWMIB] of the new entry to the relevant value (17) or (18). This should create a new entry in the pwTDMTable.
- Configure the newly created TDM PW with the required pointers, indices, and the relevant entry in pwTDMCfgTable (index 10).
In [DS1MIB] dsx1IfIndex (ifIndex = 5)
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In pwTDMCfgTable entry: Set the connection characteristic parameters:
{ pwTDMCfgPayloadSize = 43 -- payload bytes pwTDMCfgPktReorder = FALSE pwTDMCfgRtpHdrUsed = FALSE pwTDMCfgJtrBfrDepth = 30000 -- micro-seconds }-
In pwTDMTable entry: Set the relevant ifIndex, the generic TDM index, and the specific TDM index to complete creation:
{ pwTDMIfIndex = 5 -- IfIndex of associated entry -- in DS1 table pwGenTDMCfgIndex = 10 -- Index of associated entry -- in pwTDMCfgTable. pwRelTDMCfgIndex = 0 -- No Index in associated entry -- in pwXXXCfgTable. }Verify that there are no error bits set in pwTDMConfigError.
Second example:
- Configure the DS1 interface using DS1-MIB.
- Set up a bundle and get its dsx0BundleIfIndex. Setting up the bundle should involve using IFMIB properly.
- Since structured TDMoIP circuit is defined, the next MIB module to be used is TDMoIP-MIB.
- If needed, create an entry in the pwTDMCfgTable (assuming index = 7).
- If needed, create an entry in the pwXXXCfgTable (index = 11). XXX can be TDMoIP or CESoPSN.
- Verify that there are no errors in the configuration using the relevant object when signaling is in use.
- Get a new pwIndexNext [PWMIB] and create a new pwTable entry using the value of pwIndexNext.
- Set the pwType [PWMIB] of the new entry to (24). This should create a new entry in the pwTDMTable.
- Configure the newly created TDM PW with the required pointers, indices, and the relevant entries in pwTDMCfgTable and in pwXXXCfgTable (assuming indices 7 and 11).
In [DS1MIB] dsx1IfIndex (ifIndex) = 5 In [DS0MIB] dsx0BundleIfIndex = 8-
In pwTDMTable entry: Set the relevant ifIndex, the generic TDM index, and the specific TDM index to complete creation:
{ pwTDMIfIndex = 8 -- IfIndex of associated entry -- in DS0 table pwGenTDMCfgIndex = 7 -- Index of associated entry -- in pwTDMCfgTable. pwRelTDMCfgIndex = 11 -- Index of associated entry -- in pwXXXCfgTable. -- pwXXXCfgTable might be an implementation specific table too. }Verify that there are no error bits set in pwTDMConfigError.
8. Object Definition
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PW-TDM-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Counter32, Unsigned32, mib-2 FROM SNMPv2-SMI-
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF TEXTUAL-CONVENTION, TruthValue, RowStatus, StorageType, TimeStamp FROM SNMPv2-TC-
InterfaceIndexOrZero
FROM IF-MIB -- [IFMIB]
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SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- [RFC3411]
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PerfCurrentCount, PerfIntervalCount
FROM PerfHist-TC-MIB
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pwIndex
FROM PW-STD-MIB
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PwCfgIndexOrzero
FROM PW-TC-STD-MIB;
-- The TDM MIB
pwTDMMIB MODULE-IDENTITY LAST-UPDATED "200906150000Z" ORGANIZATION "Pseudo-Wire Emulation Edge-to-Edge (PWE3) Working Group" CONTACT-INFO " Orly Nicklass Postal: RADVISION Ltd. 24Raul Wallenberg St. Tel Aviv, Israel Email: orlyn@radvision.com The PWE3 Working Group (email distribution pwe3@ietf.org, http://www.ietf.org/html.charters/pwe3-charter.html) "-
DESCRIPTION
"This MIB contains managed object definitions for
encapsulating TDM (T1,E1, T3, E3, NxDS0) as
pseudo-wires over packet-switching networks (PSN).
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This MIB supplements the PW-STD-MIB as in: Zelig, D., Nadeau, T. 'Pseudowire (PW) Management Information Base'. The PW-STD-MIB contains structures and MIB associations generic to pseudowire (PW) emulation. PW-specific MIBs (such as this) contain config and stats for specific PW types.
Copyright © 2009 IETF Trust and the persons identified as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
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- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
- Neither the name of Internet Society, IETF or IETF Trust, nor the names of specific contributors, may be used to endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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This version of this MIB module is part of RFC 5604;
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see the RFC itself for full legal notices.
"
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REVISION "200906150000Z" DESCRIPTION "Initial version published as part of RFC 5604." ::= { mib-2 186 }-- Local Textual conventions
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PwTDMCfgIndex ::= TEXTUAL-CONVENTION
STATUS current DESCRIPTION "Index into the relevant pwXXXCfgTable." SYNTAX Unsigned32 (1..4294967295) -- Notifications pwTDMNotifications OBJECT IDENTIFIER ::= { pwTDMMIB 0 } -- Tables, Scalars pwTDMObjects OBJECT IDENTIFIER ::= { pwTDMMIB 1 } -- Conformance pwTDMConformance OBJECT IDENTIFIER ::= { pwTDMMIB 2 }-- TDM PW table
pwTDMTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains basic information including the ifIndex and pointers to entries in the relevant TDM config tables for this TDM PW." ::= { pwTDMObjects 1 }pwTDMEntry OBJECT-TYPE
SYNTAX PwTDMEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table is indexed by the same index that was created for the associated entry in the PW Table (in the PW-STD-MIB).-
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- The PwIndex.
An entry is created in this table by the agent for every entry in the pwTable with a pwType equal to one of the following:
e1Satop(17), t1Satop(18), e3Satop(19), t3Satop(20), basicCesPsn(21), basicTdmIp(22), tdmCasCesPsn(23), or tdmCasTdmIp(24).
Unless otherwise specified, all writeable objects in this table MUST NOT be changed after row activation in the generic pwTable (see [PWMIB]) and values must persist after reboot."
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INDEX { pwIndex } ::= { pwTDMTable 1 }PwTDMEntry ::= SEQUENCE {
pwTDMRate Integer32, pwTDMIfIndex InterfaceIndexOrZero, pwGenTDMCfgIndex PwCfgIndexOrzero, pwRelTDMCfgIndex PwCfgIndexOrzero, pwTDMConfigError BITS, pwTDMTimeElapsed Integer32, pwTDMValidIntervals Integer32, pwTDMValidDayIntervals Integer32, pwTDMLastEsTimeStamp TimeStamp }pwTDMRate OBJECT-TYPE
SYNTAX Integer32 MAX-ACCESS read-write STATUS current DESCRIPTION "The parameter represents the bit-rate of the TDM service in multiples of the 'basic' 64 Kbit/s rate [TDMCP-EXT]. It complements the definition of pwType used in PW-STD-MIB. For structure-agnostic mode, the following should be used: a) (Structure-Agnostic TDM over Packet) Satop E1 - 32 b) Satop T1 emulation: i) MUST be set to 24 in the basic emulation mode ii) MUST be set to 25 for the 'Octet-aligned T1' emulation mode c) Satop E3 - 535 d) Satop T3 - 699 For all kinds of structure-aware emulation, this parameter MUST be set to N where N is the number of DS0 channels in the corresponding attachment circuit." REFERENCE "TDMCP-EXT" DEFVAL { 32 } ::= { pwTDMEntry 1 }pwTDMIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero MAX-ACCESS read-write STATUS current DESCRIPTION "This is a unique index within the ifTable. It represents the interface index of the full link or the interface index for the bundle holding the group of time slots to be transmitted via this PW connection. A value of zero indicates an interface index that has yet to be determined. Once set, if the TDM ifIndex is (for some reason) later removed, the agent SHOULD delete the associated PW rows (e.g., this pwTDMTable entry). If the agent does not delete the rows, the agent MUST set this object to zero." ::= { pwTDMEntry 2 }pwGenTDMCfgIndex OBJECT-TYPE
SYNTAX PwCfgIndexOrzero MAX-ACCESS read-write STATUS current DESCRIPTION "Index to the generic parameters in the TDM configuration table that appears in this MIB module. It is likely that multiple TDM PWs of the same characteristic will share a single TDM Cfg entry." ::= { pwTDMEntry 3 }pwRelTDMCfgIndex OBJECT-TYPE
SYNTAX PwCfgIndexOrzero MAX-ACCESS read-write STATUS current DESCRIPTION "Index to the relevant TDM configuration table entry that appears in one of the related MIB modules such as TDMoIP or CESoPSN. It is likely that multiple TDM PWs of the same characteristic will share a single configuration entry of the relevant type. The value 0 implies no entry in other related MIBs." ::= { pwTDMEntry 4 }pwTDMConfigError OBJECT-TYPE
SYNTAX BITS { notApplicable ( 0), tdmTypeIncompatible ( 1), peerRtpIncompatible ( 2), peerPayloadSizeIncompatible ( 3) } MAX-ACCESS read-only STATUS current DESCRIPTION "Any of the bits are set if the local configuration is not compatible with the peer configuration as available from the various parameters options. Setting is done based on signaling, or else value (0) will be set.-
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-tdmTypeIncompatible bit is set if the local configuration is not carrying the same TDM type as the peer configuration.
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-peerRtpIncompatible bit is set if the local configuration
is configured to send RTP packets for this PW, and the
remote is not capable of accepting RTP packets.
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-peerPayloadSizeIncompatible bit is set if the local configuration is not carrying the same Payload Size as the peer configuration." ::= { pwTDMEntry 5}pwTDMTimeElapsed OBJECT-TYPE
SYNTAX Integer32 (1..900) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of seconds, including partial seconds, that have elapsed since the beginning of the current measurement period. If, for some reason, such as an adjustment in the system's time-of-day clock, the current interval exceeds the maximum value, the agent will return the maximum value." ::= { pwTDMEntry 6}pwTDMValidIntervals OBJECT-TYPE
SYNTAX Integer32 (0..96) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of previous 15-minute intervals for which data was collected. An agent with TDM capability must be capable of supporting at least n intervals. The minimum value of n is 4. The default of n is 32 and the maximum value of n is 96. The value will be n unless the measurement was (re-) started within the last (n*15) minutes, in which case, the value will be the number of complete 15-minute intervals for which the agent has at least some data. In certain cases (e.g., in the case where the agent is a proxy), it is possible that some intervals are unavailable. In this case, this interval is the maximum interval number for which data is available." ::= { pwTDMEntry 7}pwTDMValidDayIntervals OBJECT-TYPE
SYNTAX Integer32 (0..30) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of previous days for which data was collected. An agent with TDM capability must be capable of supporting at least n intervals. The minimum value of n is 1. The default of n is 1 and the maximum value of n is 30." ::= { pwTDMEntry 8}pwTDMLastEsTimeStamp OBJECT-TYPE
SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the most recent occasion at which the TDM PW entered the ES or SES state." ::= { pwTDMEntry 11} -- End of TDM PW table-- PW Generic TDM PW Configuration Table
pwTDMCfgIndexNext OBJECT-TYPE
SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object contains the value to be used for pwTDMCfgIndex when creating entries in the pwTDMCfgTable. The value 0 indicates that no unassigned entries are available. To obtain the value of pwTDMCfgIndexNext for a new entry in the pwTDMCfgTable, the manager issues a management protocol retrieval operation. The agent will determine through its local policy when this index value will be made available for reuse." ::= { pwTDMObjects 2 } pwTDMCfgTable OBJECT-TYPE SYNTAX SEQUENCE OF PwTDMCfgEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains a set of parameters that may be referenced by one or more TDM PWs in pwTDMTable." ::= { pwTDMObjects 3 } pwTDMCfgEntry OBJECT-TYPE SYNTAX PwTDMCfgEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "These parameters define the characteristics of a TDM PW. They are grouped here to ease NMS burden. Once an entry is created here it may be re-used by many PWs. Unless otherwise specified, all objects in this table MUST NOT be changed after row activation (see [PWMIB])." INDEX { pwTDMCfgIndex } ::= { pwTDMCfgTable 1 }PwTDMCfgEntry ::= SEQUENCE {
pwTDMCfgIndex PwTDMCfgIndex, pwTDMCfgRowStatus RowStatus, pwTDMCfgPayloadSize Unsigned32, pwTDMCfgPktReorder TruthValue, pwTDMCfgRtpHdrUsed TruthValue, pwTDMCfgJtrBfrDepth Unsigned32, pwTDMCfgPayloadSuppression INTEGER, pwTDMCfgConsecPktsInSynch Unsigned32, pwTDMCfgConsecMissPktsOutSynch Unsigned32, pwTDMCfgSetUp2SynchTimeOut Unsigned32, pwTDMCfgPktReplacePolicy INTEGER, pwTDMCfgAvePktLossTimeWindow Integer32, pwTDMCfgExcessivePktLossThreshold Unsigned32, pwTDMCfgAlarmThreshold Unsigned32, pwTDMCfgClearAlarmThreshold Unsigned32, pwTDMCfgMissingPktsToSes Unsigned32, pwTDMCfgTimestampMode INTEGER, pwTDMCfgStorageType StorageType, pwTDMCfgPktFiller Unsigned32, pwTDMCfgName SnmpAdminString } pwTDMCfgIndex OBJECT-TYPE SYNTAX PwTDMCfgIndex MAX-ACCESS not-accessible STATUS current DESCRIPTION "Index to an entry in this table. When an NMS creates a new entry/row in this table, it best makes use of the value of the pwTDMCfgIndexNext object in order to find a free or available index value." ::= { pwTDMCfgEntry 1 } pwTDMCfgRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Object used for creating, modifying, and deleting a row from this table. The following objects cannot be modified if the entry is in use and the status is active: pwTDMCfgPayloadSize, pwTDMCfgRtpHdrUsed, pwTDMCfgJtrBfrDepth, and pwTDMCfgPayloadSuppression. The row cannot be deleted if the entry is in use." ::= { pwTDMCfgEntry 2 }pwTDMCfgPayloadSize OBJECT-TYPE
SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The value of this object indicates the PayLoad Size (in bytes) to be defined during the PW setUp. Upon TX, implementation must be capable of carrying that amount of bytes. Upon RX, when the Low Entry Networking (LEN) field is set to 0, the payload of packet MUST assume this size, and if the actual packet size is inconsistent with this length, the packet MUST be considered to be malformed." ::= { pwTDMCfgEntry 4 }pwTDMCfgPktReorder OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "If set to True: as CE-bound packets are queued in the jitter buffer, out of order packets are re-ordered. The maximum sequence number differential (i.e., the range in which re-sequencing can occur) is dependant on the depth of the jitter buffer. See pwTDMCfgJtrBfrDepth. NOTE: Some implementations may not support this feature. The agent should then reject a SET request for true." ::= { pwTDMCfgEntry 5 }pwTDMCfgRtpHdrUsed OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "If set to False: an RTP header is not pre-pended to the TDM packet." REFERENCE "SATOP" DEFVAL { false } ::= { pwTDMCfgEntry 6 }pwTDMCfgJtrBfrDepth OBJECT-TYPE
SYNTAX Unsigned32 UNITS "microsecond" MAX-ACCESS read-create STATUS current DESCRIPTION "The size of this buffer SHOULD be locally configured to allow accommodation to the PSN-specific packet delay variation.-
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If configured to a value not supported by the implementation, the agent MUST return an error code 'jtrBfrDepth' in 'pwTDMConfigError'.
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NOTE: jitter buffers are a limited resource to be managed. The actual size should be at least twice as big as the value of pwTDMCfgJtrBfrDepth." DEFVAL { 3000 } ::= { pwTDMCfgEntry 7 } pwTDMCfgPayloadSuppression OBJECT-TYPE SYNTAX INTEGER { enable ( 1), disable ( 2) } MAX-ACCESS read-create STATUS current DESCRIPTION "Selecting 'enable' means: Payload suppression is allowed. Payload MAY be omitted in order to conserve bandwidth. Selecting 'disable' means: No suppression under any condition. Object MAY be changed at any time." DEFVAL { disable } ::= { pwTDMCfgEntry 8 } pwTDMCfgConsecPktsInSynch OBJECT-TYPE SYNTAX Unsigned32 (1..10) MAX-ACCESS read-create STATUS current DESCRIPTION "The number of consecutive packets with sequential sequence numbers that are required to exit the LOPS. Object MAY be changed only when the related PW is defined as not active." REFERENCE "SATOP" DEFVAL { 2 } ::= { pwTDMCfgEntry 9 } pwTDMCfgConsecMissPktsOutSynch OBJECT-TYPE SYNTAX Unsigned32 (1..15) MAX-ACCESS read-create STATUS current DESCRIPTION "The number of consecutive missing packets that are required to enter the LOPS. Object MAY be changed only when the related PW is defined as not active." REFERENCE "SATOP" DEFVAL { 10 } ::= { pwTDMCfgEntry 10 }pwTDMCfgSetUp2SynchTimeOut OBJECT-TYPE
SYNTAX Unsigned32 UNITS "millisecond" MAX-ACCESS read-create STATUS current DESCRIPTION "The amount of time the host should wait before declaring the pseudowire in a down state, if the number of consecutive TDM packets that have been received after changing the administrative status to up and after finalization of signaling (if supported) between the two PEs is smaller than pwTDMCfgConsecPktsInSynch. Once the PW has OperStatus of 'up', this parameter is no longer valid. This parameter is defined to ensure that the host does not prematurely inform failure of the PW. In particular, PW 'down' notifications should not be sent before expiration of this timer. This parameter is valid only after administrative changes of the status of the PW. If the PW fails due to network impairments, a 'down' notification should be sent. Object MAY be changed only when the related PW is defined as not active." DEFVAL {5000} ::= { pwTDMCfgEntry 11 }pwTDMCfgPktReplacePolicy OBJECT-TYPE
SYNTAX INTEGER { allOnes (1), implementationSpecific(2), filler (3) --user defined } MAX-ACCESS read-create STATUS current DESCRIPTION "This parameter determines the value to be played when CE bound packets over/underflow the jitter buffer, or are missing for any reason. This byte pattern is sent (played) on the TDM line. Selecting implementationSpecific(2) implies an agent-specific algorithm. Selecting filler(3) requires the setting of pwTDMCfgPktFiller. Object MAY be changed only when the related PW is defined as not active." DEFVAL { allOnes } -- Play AIS ::= { pwTDMCfgEntry 12 }pwTDMCfgAvePktLossTimeWindow OBJECT-TYPE
SYNTAX Integer32 UNITS "millisecond" MAX-ACCESS read-create STATUS current DESCRIPTION "The length of time over which the average packet loss rate should be computed to detect excessive packet loss rate. Object MAY be changed only when the related PW is defined as not active." ::= { pwTDMCfgEntry 13}pwTDMCfgExcessivePktLossThreshold OBJECT-TYPE
SYNTAX Unsigned32 UNITS "Percent" MAX-ACCESS read-create STATUS current DESCRIPTION "Excessive packet loss rate is detected by computing the average packet-loss rate over a pwTDMCfgAvePktLossTimeWindow amount of time and comparing it with this threshold value. The rate is expressed in percentage. Object MAY be changed only when the related PW is defined as not active." ::= { pwTDMCfgEntry 14 }pwTDMCfgAlarmThreshold OBJECT-TYPE
SYNTAX Unsigned32 UNITS "milisec" MAX-ACCESS read-create STATUS current DESCRIPTION "Alarms are only reported when the defect state persists for the length of time specified by this object. Object MAY be changed only when the related PW is defined as not active." DEFVAL { 2500 } ::= { pwTDMCfgEntry 15 }pwTDMCfgClearAlarmThreshold OBJECT-TYPE
SYNTAX Unsigned32 UNITS "milisec" MAX-ACCESS read-create STATUS current DESCRIPTION "Alarm MUST be cleared after the corresponding defect is undetected for the amount of time specified by this object. Object MAY be changed only when the related PW is defined as not active." DEFVAL { 10000 } ::= { pwTDMCfgEntry 16 }pwTDMCfgMissingPktsToSes OBJECT-TYPE
SYNTAX Unsigned32 UNITS "Percent" MAX-ACCESS read-create STATUS current DESCRIPTION "Percent of missing packets detected (consecutive or not) within a 1-second window to cause a Severely Error Second (SES) to be counted. Object MAY be changed only when the related PW is defined as not active." DEFVAL { 30 } ::= { pwTDMCfgEntry 17 } pwTDMCfgTimestampMode OBJECT-TYPE SYNTAX INTEGER { notApplicable (1), absolute (2), differential (3) } MAX-ACCESS read-create STATUS current DESCRIPTION "Timestamp generation MAY be used in one of the following modes: 1. Absolute mode: The PSN-bound IWF sets timestamps using the clock recovered from the incoming TDM attachment circuit. As a consequence, the timestamps are closely correlated with the sequence numbers. All TDM implementations that support usage of the RTP header MUST support this mode. 2. Differential mode: Both IWFs have access to a common high- quality timing source, and this source is used for timestamp generation. Support of this mode is OPTIONAL. Object MAY be changed only when the related PW is defined as not active." ::= { pwTDMCfgEntry 18 } pwTDMCfgStorageType OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "This variable indicates the storage type for this row. Conceptual rows having the value permanent(4) must allow write-access to all columnar objects." ::= { pwTDMCfgEntry 19 }pwTDMCfgPktFiller OBJECT-TYPE
SYNTAX Unsigned32 (0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "Filler byte pattern played out on the TDM interface if pwTDMCfgPktReplacePolicy was set to filler(3). Object MAY be changed only when the related PW is defined as not active." DEFVAL { 255 } -- Play all ones, equal to AIS indications. ::= { pwTDMCfgEntry 20 }pwTDMCfgName OBJECT-TYPE
SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "A descriptive string, preferably a unique name, to an entry in this table. Object MAY be changed at any time." ::= { pwTDMCfgEntry 21 }-- End of Table
-- The following counters work together to integrate
-- errors and the lack of errors on the TDM PW. An error is -- caused by a missing packet. A missing packet can be a result -- of: packet loss in the network, (uncorrectable) packet out -- of sequence, packet length error, jitter buffer overflow, -- and jitter buffer underflow. The result is declaring whether -- or not the TDM PW is in Loss of Packet State (LOPS).-- TDM PW Performance Current Table
pwTDMPerfCurrentTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMPerfCurrentEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The current 15-minute interval counts are in this table.
This table provides per TDM PW performance information."
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::= { pwTDMObjects 5 }pwTDMPerfCurrentEntry OBJECT-TYPE
SYNTAX PwTDMPerfCurrentEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in this table is created by the agent for every pwTDMTable entry. After 15 minutes, the contents of this table entry are copied to a new entry in the pwTDMPerfInterval table, and the counts in this entry are reset to zero." INDEX { pwIndex } ::= { pwTDMPerfCurrentTable 1 }PwTDMPerfCurrentEntry ::= SEQUENCE {
pwTDMPerfCurrentMissingPkts PerfCurrentCount, pwTDMPerfCurrentPktsReOrder PerfCurrentCount, pwTDMPerfCurrentJtrBfrUnderruns PerfCurrentCount, pwTDMPerfCurrentMisOrderDropped PerfCurrentCount, pwTDMPerfCurrentMalformedPkt PerfCurrentCount, pwTDMPerfCurrentESs PerfCurrentCount, pwTDMPerfCurrentSESs PerfCurrentCount, pwTDMPerfCurrentUASs PerfCurrentCount, pwTDMPerfCurrentFC PerfCurrentCount }pwTDMPerfCurrentMissingPkts OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of missing packets (as detected via control word sequence number gaps)." ::= { pwTDMPerfCurrentEntry 1 }pwTDMPerfCurrentPktsReOrder OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected out of sequence (via control word sequence number) but successfully re-ordered. Note: some implementations may not support this feature." ::= { pwTDMPerfCurrentEntry 2 }pwTDMPerfCurrentJtrBfrUnderruns OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of times a packet needed to be played out and the jitter buffer was empty." ::= { pwTDMPerfCurrentEntry 3 }pwTDMPerfCurrentMisOrderDropped OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected out of order (via control word sequence numbers) that could not be re-ordered or could not fit in the jitter buffer." ::= { pwTDMPerfCurrentEntry 4 }pwTDMPerfCurrentMalformedPkt OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected with unexpected size or bad headers' stack." ::= { pwTDMPerfCurrentEntry 5 }pwTDMPerfCurrentESs OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Error Seconds encountered. Any malformed packet, sequence error, LOPS, and the like are considered as Error Seconds." ::= { pwTDMPerfCurrentEntry 6 }pwTDMPerfCurrentSESs OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Severely Error Seconds encountered." ::= { pwTDMPerfCurrentEntry 7 }pwTDMPerfCurrentUASs OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Unavailable Seconds encountered. Any consecutive ten seconds of SES are counted as one Unavailable Seconds (UAS)." ::= { pwTDMPerfCurrentEntry 8 }pwTDMPerfCurrentFC OBJECT-TYPE
SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "TDM Failure Counts (FC-TDM). The number of TDM failure events. A failure event begins when the LOPS failure is declared, and it ends when the failure is cleared. A failure event that begins in one period and ends in another period is counted only in the period in which it begins." ::= { pwTDMPerfCurrentEntry 9 }-- End TDM PW Performance Current Interval Table
-- TDM PW Performance Interval Table
pwTDMPerfIntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMPerfIntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table provides performance information per TDM PW similar to the pwTDMPerfCurrentTable above. However, these counts represent historical 15-minute intervals. Typically, this table will have a maximum of 96 entries for a 24 hour period, but is not limited to this." ::= { pwTDMObjects 6 }pwTDMPerfIntervalEntry OBJECT-TYPE
SYNTAX PwTDMPerfIntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in this table is created by the agent for every pwTDMPerfCurrentEntry that is 15 minutes old. The contents of the Current entry are copied to the new entry here. The Current entry then resets its counts to zero for the next current 15-minute interval." INDEX { pwIndex, pwTDMPerfIntervalNumber } ::= { pwTDMPerfIntervalTable 1 }PwTDMPerfIntervalEntry ::= SEQUENCE {
pwTDMPerfIntervalNumber Unsigned32, pwTDMPerfIntervalValidData TruthValue, pwTDMPerfIntervalDuration Unsigned32, pwTDMPerfIntervalMissingPkts PerfIntervalCount, pwTDMPerfIntervalPktsReOrder PerfIntervalCount, pwTDMPerfIntervalJtrBfrUnderruns PerfIntervalCount, pwTDMPerfIntervalMisOrderDropped PerfIntervalCount, pwTDMPerfIntervalMalformedPkt PerfIntervalCount, pwTDMPerfIntervalESs PerfIntervalCount, pwTDMPerfIntervalSESs PerfIntervalCount, pwTDMPerfIntervalUASs PerfIntervalCount, pwTDMPerfIntervalFC PerfIntervalCount }pwTDMPerfIntervalNumber OBJECT-TYPE
SYNTAX Unsigned32 (1..96) MAX-ACCESS not-accessible STATUS current DESCRIPTION "A number (normally between 1 and 96 to cover a 24 hour period) that identifies the interval for which the set of statistics is available. The interval identified by 1 is the most recently completed 15-minute interval, and the interval identified by N is the interval immediately preceding the one identified by N-1. The minimum range of N is 1 through 4. The default range is 1 through 32. The maximum value of N is 1 through 96." ::= { pwTDMPerfIntervalEntry 1 }pwTDMPerfIntervalValidData OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "This variable indicates if the data for this interval is valid." ::= { pwTDMPerfIntervalEntry 2 }pwTDMPerfIntervalDuration OBJECT-TYPE
SYNTAX Unsigned32 UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The duration of a particular interval in seconds. Adjustments in the system's time-of-day clock may cause the interval to be greater or less than the normal value. Therefore, this actual interval value is provided." ::= { pwTDMPerfIntervalEntry 3 }pwTDMPerfIntervalMissingPkts OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of missing packets (as detected via control word sequence number gaps)." ::= { pwTDMPerfIntervalEntry 4 }pwTDMPerfIntervalPktsReOrder OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected out of sequence (via control word sequence number) but successfully re-ordered. Note: some implementations may not support this feature." ::= { pwTDMPerfIntervalEntry 5 }pwTDMPerfIntervalJtrBfrUnderruns OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of times a packet needed to be played out and the jitter buffer was empty." ::= { pwTDMPerfIntervalEntry 6 }pwTDMPerfIntervalMisOrderDropped OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected out of order (via control word sequence numbers) that could not be re-ordered or could not fit in the jitter buffer." ::= { pwTDMPerfIntervalEntry 7 }pwTDMPerfIntervalMalformedPkt OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected with unexpected size, or bad headers' stack" ::= { pwTDMPerfIntervalEntry 8 }pwTDMPerfIntervalESs OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Error Seconds encountered." ::= { pwTDMPerfIntervalEntry 9 }pwTDMPerfIntervalSESs OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Severely Error Seconds encountered." ::= { pwTDMPerfIntervalEntry 10 }pwTDMPerfIntervalUASs OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Unavailable Seconds encountered." ::= { pwTDMPerfIntervalEntry 11 }pwTDMPerfIntervalFC OBJECT-TYPE
SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "TDM Failure Counts (FC-TDM). The number of TDM failure events. A failure event begins when the LOPS failure is declared, and it ends when the failure is cleared. A failure event that begins in one period and ends in another period is counted only in the period in which it begins." ::= { pwTDMPerfIntervalEntry 12 }-- End TDM PW Performance Interval Table
-- TDM PW 1day Performance Table
pwTDMPerf1DayIntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMPerf1DayIntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table provides performance information per TDM PW similar to the pwTDMPerfIntervalTable above. However, these counters represent historical one-day intervals up to one full month. The table consists of real-time data, as such it is not persistence across re-boot." ::= { pwTDMObjects 7 }pwTDMPerf1DayIntervalEntry OBJECT-TYPE
SYNTAX PwTDMPerf1DayIntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry is created in this table by the agent for every entry in the pwTDMTable table." INDEX { pwIndex,pwTDMPerf1DayIntervalNumber } ::= { pwTDMPerf1DayIntervalTable 1 }PwTDMPerf1DayIntervalEntry ::= SEQUENCE {
pwTDMPerf1DayIntervalNumber Unsigned32, pwTDMPerf1DayIntervalValidData TruthValue, pwTDMPerf1DayIntervalDuration Unsigned32, pwTDMPerf1DayIntervalMissingPkts Counter32, pwTDMPerf1DayIntervalPktsReOrder Counter32, pwTDMPerf1DayIntervalJtrBfrUnderruns Counter32, pwTDMPerf1DayIntervalMisOrderDropped Counter32, pwTDMPerf1DayIntervalMalformedPkt Counter32, pwTDMPerf1DayIntervalESs Counter32, pwTDMPerf1DayIntervalSESs Counter32, pwTDMPerf1DayIntervalUASs Counter32, pwTDMPerf1DayIntervalFC Counter32 }pwTDMPerf1DayIntervalNumber OBJECT-TYPE
SYNTAX Unsigned32 (1..30) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The number of intervals where 1 indicates the current day measured period and 2 and above indicate previous days, respectively." ::= { pwTDMPerf1DayIntervalEntry 1 }pwTDMPerf1DayIntervalValidData OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "This variable indicates if the data for this interval is valid." ::= { pwTDMPerf1DayIntervalEntry 2 }pwTDMPerf1DayIntervalDuration OBJECT-TYPE
SYNTAX Unsigned32 UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The duration of a particular interval in seconds. Adjustments in the system's time-of-day clock may cause the interval to be greater or less than the normal value. Therefore, this actual interval value is provided." ::= { pwTDMPerf1DayIntervalEntry 3 }pwTDMPerf1DayIntervalMissingPkts OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of missing packets (as detected via control word sequence number gaps)." ::= { pwTDMPerf1DayIntervalEntry 4 }pwTDMPerf1DayIntervalPktsReOrder OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected out of sequence (via control word sequence number) but successfully re-ordered. Note: some implementations may not support this feature." ::= { pwTDMPerf1DayIntervalEntry 5 }pwTDMPerf1DayIntervalJtrBfrUnderruns OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of times a packet needed to be played out and the jitter buffer was empty." ::= { pwTDMPerf1DayIntervalEntry 6 }pwTDMPerf1DayIntervalMisOrderDropped OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected out of order (via control word sequence numbers) that could not be re-ordered or could not fit in the jitter buffer." ::= { pwTDMPerf1DayIntervalEntry 7 }pwTDMPerf1DayIntervalMalformedPkt OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets detected with unexpected size or bad headers' stack." ::= { pwTDMPerf1DayIntervalEntry 8 }pwTDMPerf1DayIntervalESs OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Error Seconds encountered." ::= { pwTDMPerf1DayIntervalEntry 9 }pwTDMPerf1DayIntervalSESs OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of Severely Error Seconds." ::= { pwTDMPerf1DayIntervalEntry 10 }pwTDMPerf1DayIntervalUASs OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The counter associated with the number of UnAvailable Seconds.
NOTE: When first entering the UAS state, the number
of SES to UAS is added to this object, then as each
additional UAS occurs, this object increments by one."
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::= { pwTDMPerf1DayIntervalEntry 11 }pwTDMPerf1DayIntervalFC OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "TDM Failure Counts (FC-TDM). The number of TDM failure events. A failure event begins when the LOPS failure is declared, and it ends when the failure is cleared." ::= { pwTDMPerf1DayIntervalEntry 12 }-- End of PW TDM Performance table
-- Conformance Information pwTDMCompliances OBJECT IDENTIFIER ::= { pwTDMConformance 1 } pwTDMGroups OBJECT IDENTIFIER ::= { pwTDMConformance 2 }pwTDMModuleCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for agent that support TDM PW over PSN operation." MODULE -- this module MANDATORY-GROUPS { pwTDMGroup, pwTDMPerfCurrentGroup, pwTDMPerfIntervalGroup, pwTDMPerf1DayIntervalGroup } OBJECT pwGenTDMCfgIndex MIN-ACCESS read-only DESCRIPTION "The ability to set an index pointer is not required." OBJECT pwRelTDMCfgIndex MIN-ACCESS read-only DESCRIPTION "The ability to set an index pointer is not required." OBJECT pwTDMCfgPktReorder MIN-ACCESS read-only DESCRIPTION "The ability to set the packet reordering is not required. If the feature is not supported, the value set by the agent MUST be FALSE." OBJECT pwTDMCfgRtpHdrUsed MIN-ACCESS read-only DESCRIPTION "The ability to set whether or not to use the RTP header is not required." OBJECT pwTDMCfgPayloadSuppression MIN-ACCESS read-only DESCRIPTION "The ability to set this object is not required." OBJECT pwTDMCfgPktReplacePolicy MIN-ACCESS read-only DESCRIPTION "The ability to set the replace policy is not required." OBJECT pwTDMCfgStorageType MIN-ACCESS read-only DESCRIPTION "The ability to set the storage type is not required." OBJECT pwTDMCfgPktFiller MIN-ACCESS read-only DESCRIPTION "The ability to set the filler pattern is not required." OBJECT pwTDMCfgName MIN-ACCESS read-only DESCRIPTION "The ability to set an alias is not required." ::= { pwTDMCompliances 1 }-- Units of conformance
pwTDMGroup OBJECT-GROUP
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OBJECTS {
pwTDMRate, pwTDMIfIndex, pwGenTDMCfgIndex, pwRelTDMCfgIndex, pwTDMConfigError, pwTDMTimeElapsed, pwTDMValidIntervals, pwTDMValidDayIntervals,-
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pwTDMLastEsTimeStamp,
pwTDMCfgIndexNext,
pwTDMCfgRowStatus,
pwTDMCfgPayloadSize,
pwTDMCfgPktReorder,
pwTDMCfgRtpHdrUsed,
pwTDMCfgJtrBfrDepth,
pwTDMCfgPayloadSuppression, pwTDMCfgConsecPktsInSynch, pwTDMCfgConsecMissPktsOutSynch, pwTDMCfgSetUp2SynchTimeOut,pwTDMCfgPktReplacePolicy,
pwTDMCfgAvePktLossTimeWindow , pwTDMCfgExcessivePktLossThreshold,
pwTDMCfgAlarmThreshold ,
pwTDMCfgClearAlarmThreshold, pwTDMCfgMissingPktsToSes,
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pwTDMCfgTimestampMode, pwTDMCfgStorageType, pwTDMCfgPktFiller, pwTDMCfgName } STATUS current DESCRIPTION "Collection of objects for basic TDM PW config and status." ::= { pwTDMGroups 1 }pwTDMPerfCurrentGroup OBJECT-GROUP
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OBJECTS {
pwTDMPerfCurrentMissingPkts, pwTDMPerfCurrentPktsReOrder, pwTDMPerfCurrentJtrBfrUnderruns, pwTDMPerfCurrentMisOrderDropped, pwTDMPerfCurrentMalformedPkt, pwTDMPerfCurrentESs, pwTDMPerfCurrentSESs, pwTDMPerfCurrentUASs, pwTDMPerfCurrentFC } STATUS current DESCRIPTION "Collection of current statistics objects for TDM PWs." ::= { pwTDMGroups 2 }pwTDMPerfIntervalGroup OBJECT-GROUP
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OBJECTS {
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pwTDMPerfIntervalValidData, pwTDMPerfIntervalDuration,
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pwTDMPerfIntervalMissingPkts, pwTDMPerfIntervalPktsReOrder, pwTDMPerfIntervalJtrBfrUnderruns, pwTDMPerfIntervalMisOrderDropped, pwTDMPerfIntervalMalformedPkt,-
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pwTDMPerfIntervalESs,
pwTDMPerfIntervalSESs,
pwTDMPerfIntervalUASs,
pwTDMPerfIntervalFC
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} STATUS current DESCRIPTION "Collection of Interval statistics objects for TDM PWs." ::= { pwTDMGroups 3 }pwTDMPerf1DayIntervalGroup OBJECT-GROUP
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OBJECTS {
pwTDMPerf1DayIntervalValidData, pwTDMPerf1DayIntervalDuration, pwTDMPerf1DayIntervalMissingPkts, pwTDMPerf1DayIntervalPktsReOrder, pwTDMPerf1DayIntervalJtrBfrUnderruns, pwTDMPerf1DayIntervalMisOrderDropped, pwTDMPerf1DayIntervalMalformedPkt, pwTDMPerf1DayIntervalESs, pwTDMPerf1DayIntervalSESs, pwTDMPerf1DayIntervalUASs, pwTDMPerf1DayIntervalFC } STATUS current DESCRIPTION "Collection of Daily statistics objects for TDM PWs." ::= { pwTDMGroups 4 } END
9. Security Considerations
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It is clear that this MIB module is potentially useful for monitoring of TDM PWs. This MIB can also be used for configuration of certain objects, and anything that can be configured can be incorrectly configured, with potentially disastrous results.
There are a number of management objects defined in this MIB module with a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These are the tables and objects and their sensitivity/vulnerability:
The pwTDMTable and pwTDMCfgTable contain objects of TDM PW parameters on a Provider Edge (PE) device. Unauthorized access to objects in these tables could result in disruption of traffic on the network.
The use of stronger mechanisms such as SNMPv3 security should be considered where possible. Specifically, SNMPv3 VACM and USM MUST be used with any SNMPV3 agent, which implements this MIB module.
Administrators should consider whether read access to these objects should be allowed, since read access may be undesirable under certain circumstances.
Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible) may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability:
The pwTDMTable, pwTDMPerfCurrentTable, pwTDMPerfIntervalTable, and pwTDMPerf1DayIntervalTable collectively show the TDM pseudowire connectivity topology and its performance characteristics.
If an Administrator does not want to reveal this information, then these tables should be considered sensitive/vulnerable.
SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module.
It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).
Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.
10. IANA Considerations
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The MIB module in this document uses the following IANA-assigned OBJECT IDENTIFIER values recorded in the SMI Numbers registry:
Descriptor OBJECT IDENTIFIER value ---------- ----------------------- pwTDMMIB { mib-2 186 }
11. References
11.1. Normative References
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[SATOP] Vainshtein, A., Ed., and YJ. Stein, Ed., "Structure- Agnostic Time Division Multiplexing (TDM) over Packet (SAToP)", RFC 4553, June 2006. [TDMCP-EXT] Vainshtein, A. and Y(J). Stein, "Control Protocol Extensions for the Setup of Time-Division Multiplexing (TDM) Pseudowires in MPLS Networks", RFC 5287, August 2008. [PWMIB] Nadeau, T., Ed., and D. Zelig, Ed., "Pseudowire (PW) Management Information Base", RFC 5601, July 2009. [PWTC] Nadeau, T., Ed., Zelig, D., Ed., and O. Nicklass, Ed., "Definitions for Textual Conventions for Pseudowire (PW) Management", RFC 5542, May 2009. [DS1MIB] Nicklass, O., Ed., "Definitions of Managed Objects for the DS1, J1, E1, DS2, and E2 Interface Types", RFC 4805, March 2007. [DS3MIB] Nicklass, O., Ed., "Definitions of Managed Objects for the DS3/E3 Interface Type", RFC 3896, September 2004. [DS0MIB] Fowler, D., Ed., "Definitions of Managed Objects for the DS0 and DS0 Bundle Interface Type", RFC 2494, January 1999. [IFMIB] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks", STD 62, RFC 3411, December 2002. [BCP14] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
11.2. Informative References
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[RFC4197] Riegel, M., Ed., "Requirements for Edge-to-Edge Emulation of Time Division Multiplexed (TDM) Circuits over Packet Switching Networks", RFC 4197, October 2005. [RFC3985] Bryant, S., Ed., and P. Pate, Ed., "Pseudo Wire Emulation Edge-to-Edge (PWE3) Architecture", RFC 3985, March 2005. [TDMOIP] Y(J). Stein, Shashoua, R., Insler, R., and M. Anavi, "Time Division Multiplexing over IP (TDMoIP)", RFC 5087, December 2007. [CESOPSN] Vainshtein A., Sasson, I., Sadovski, A., Metz, E., Frost, T., and P. Pate "Structured TDM Circuit Emulation Service over Packet Switched Network (CESoPSN)", Work in Progress, October 2003. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet-Standard Management Framework", RFC 3410, December 2002.
12. Acknowledgements
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This document was produced by the PWE3 Working Group. Special thanks to Yaakov Stein, Doron Tzur, Sasha Vainshtein, and Ron Cohen for close review and good suggestions.
Author's Address
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Orly Nicklass
RADVISION Ltd.
24 Raul Wallenberg St.
Tel Aviv
ISRAELPhone: +972 3 7679444 EMail: orlyn@radvision.com