Request for Comments: 7331
Category: Standards Track
ISSN: 2070-1721
Brocade
Z. Ali
N. Akiya
Cisco Systems
August 2014
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Bidirectional Forwarding Detection (BFD) Management Information Base
Abstract
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This document 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 modeling the Bidirectional Forwarding Detection (BFD) protocol.
Status of This Memo
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This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7331.
Copyright Notice
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Copyright © 2014 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 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.
Table of Contents
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. The Internet-Standard Management Framework . . . . . . . . . 2 3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Brief Description of MIB Objects . . . . . . . . . . . . . . 3 4.1. General Variables . . . . . . . . . . . . . . . . . . . . 3 4.2. Session Table (bfdSessionTable) . . . . . . . . . . . . . 3 4.3. Session Performance Table (bfdSessionPerfTable) . . . . . 3 4.4. BFD Session Discriminator Mapping Table (bfdSessDiscMapTable) . . . . . . . . . . . . . . . . . . 3 4.5. BFD Session IP Mapping Table (bfdSessIpMapTable) . . . . 4 5. BFD MIB Module Definitions . . . . . . . . . . . . . . . . . 4 6. Security Considerations . . . . . . . . . . . . . . . . . . . 35 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 37 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 37 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 38 9.1. Normative References . . . . . . . . . . . . . . . . . . 38 9.2. Informative References . . . . . . . . . . . . . . . . . 39
1. Introduction
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This memo defines a portion of the MIB for use with network management protocols in the Internet community. In particular, it describes managed objects to configure and/or monitor Bidirectional Forwarding Detection for [RFC5880], [RFC5881], [RFC5883], and [RFC7130], BFD versions 0 and/or 1, on devices supporting this feature.
This memo does not define a compliance requirement for a system that only implements BFD version 0. This is a reflection of a considered and deliberate decision by the BFD WG because the BFD version 0 protocol is primarily of historical interest by comparison to the widespread deployment of the BFD version 1 protocol.
2. 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].
As with all MIB modules, an attempt to SET or CREATE an object to a value that is not supported by the implementation will result in a failure using a return code that indicates that the value is not supported.
3. Terminology
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This document adopts the definitions, acronyms, and mechanisms described in [RFC5880], [RFC5881], [RFC5883], and [RFC7130]. Unless otherwise stated, the mechanisms described therein will not be redescribed here.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, RFC 2119 [RFC2119].
4. Brief Description of MIB Objects
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This section describes objects pertaining to BFD. The MIB objects are derived from [RFC5880], [RFC5881], [RFC5883], and [RFC7130], and also include textual conventions defined in [RFC7330].
4.1. General Variables
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The General Variables are used to identify parameters that are global to the BFD process.
4.2. Session Table (bfdSessionTable)
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The session table is used to identify a BFD session between a pair of nodes.
4.3. Session Performance Table (bfdSessionPerfTable)
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The session performance table is used for collecting BFD performance counters on a per-session basis. This table is an AUGMENT to the bfdSessionTable.
4.4. BFD Session Discriminator Mapping Table (bfdSessDiscMapTable)
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The BFD Session Discriminator Mapping Table provides a mapping between a local discriminator value to the associated BFD session found in the bfdSessionTable.
4.5. BFD Session IP Mapping Table (bfdSessIpMapTable)
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Given bfdSessInterface, bfdSessSrcAddrType, bfdSessSrcAddr, bfdSessDstAddrType, and bfdSessSrcAddrType, the BFD Session IP Mapping Table maps to an associated BFD session found in the bfdSessionTable. This table SHOULD contain those BFD sessions that are of type "IP".
5. BFD MIB Module Definitions
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This MIB module makes references to the following documents: [RFC2578], [RFC2579], [RFC2580], [RFC2863], [RFC3289], [RFC3413], [RFC5082], [RFC5880], and [RFC5881]. BFD-STD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, mib-2, Integer32, Unsigned32, Counter32, Counter64 FROM SNMPv2-SMI -- RFC 2578-
TruthValue, RowStatus, StorageType, TimeStamp
FROM SNMPv2-TC -- RFC 2579
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MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF -- RFC 2580-
InterfaceIndexOrZero
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FROM IF-MIB -- RFC 2863
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InetAddress, InetAddressType, InetPortNumber
FROM INET-ADDRESS-MIB
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IndexIntegerNextFree
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FROM DIFFSERV-MIB -- RFC 3289
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BfdSessIndexTC, BfdIntervalTC, BfdMultiplierTC, BfdCtrlDestPortNumberTC, BfdCtrlSourcePortNumberTC FROM BFD-TC-STD-MIB IANAbfdDiagTC, IANAbfdSessTypeTC, IANAbfdSessOperModeTC, IANAbfdSessStateTC, IANAbfdSessAuthenticationTypeTC, IANAbfdSessAuthenticationKeyTC FROM IANA-BFD-TC-STD-MIB;bfdMIB MODULE-IDENTITY
LAST-UPDATED "201408120000Z" -- 12 August 2014 00:00:00 GMT ORGANIZATION "IETF Bidirectional Forwarding Detection Working Group" CONTACT-INFO "Thomas D. Nadeau Brocade Email: tnadeau@lucidvision.com Zafar Ali Cisco Systems, Inc. Email: zali@cisco.com Nobo Akiya Cisco Systems, Inc. Email: nobo@cisco.com Comments about this document should be emailed directly to the BFD Working Group mailing list at rtg-bfd@ietf.org" DESCRIPTION "Bidirectional Forwarding Management Information Base.-
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Copyright © 2014 IETF Trust and the persons identified as authors of the code. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info)." REVISION "201408120000Z" -- 12 August 2014 00:00:00 GMT DESCRIPTION "Initial version. Published as RFC 7331." ::= { mib-2 222 }
-- Top-level components of this MIB module.
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bfdNotifications OBJECT IDENTIFIER ::= { bfdMIB 0 } bfdObjects OBJECT IDENTIFIER ::= { bfdMIB 1 } bfdConformance OBJECT IDENTIFIER ::= { bfdMIB 2 } bfdScalarObjects OBJECT IDENTIFIER ::= { bfdObjects 1 }
-- BFD General Variables
-- These parameters apply globally to the system's
-- BFD process.
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bfdAdminStatus OBJECT-TYPE
SYNTAX INTEGER { enabled(1), disabled(2), adminDown(3), down(4) } MAX-ACCESS read-write STATUS current DESCRIPTION "The desired global administrative status of the BFD system in this device." ::= { bfdScalarObjects 1 }bfdOperStatus OBJECT-TYPE
SYNTAX INTEGER { up(1), down(2), adminDown(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "Indicates the actual operational status of the BFD system in this device. When this value is down(2), all entries in the bfdSessTable MUST have their bfdSessOperStatus as down(2) as well. When this value is adminDown(3), all entries in the bfdSessTable MUST have their bfdSessOperStatus as adminDown(3) as well." ::= { bfdScalarObjects 2 }bfdNotificationsEnable OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-write STATUS current DESCRIPTION "If this object is set to true(1), then it enables the emission of bfdSessUp and bfdSessDown notifications; otherwise, these notifications are not emitted." REFERENCE "See also RFC 3413, Simple Network Management Protocol (SNMP) Applications, for explanation that notifications are under the ultimate control of the MIB modules in this document." DEFVAL { false } ::= { bfdScalarObjects 3 }bfdSessIndexNext OBJECT-TYPE
SYNTAX IndexIntegerNextFree (0..4294967295) MAX-ACCESS read-only STATUS current DESCRIPTION "This object contains an unused value for bfdSessIndex that can be used when creating entries in the table. A zero indicates that no entries are available, but it MUST NOT be used as a valid index. " ::= { bfdScalarObjects 4 }
-- BFD Session Table
-- The BFD Session Table specifies BFD session-specific
-- information.
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bfdSessTable OBJECT-TYPE
SYNTAX SEQUENCE OF BfdSessEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BFD Session Table describes the BFD sessions." REFERENCE "RFC 5880, Bidirectional Forwarding Detection (BFD)." ::= { bfdObjects 2 }bfdSessEntry OBJECT-TYPE
SYNTAX BfdSessEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BFD Session Entry describes the BFD session." INDEX { bfdSessIndex } ::= { bfdSessTable 1 }BfdSessEntry ::= SEQUENCE {
bfdSessIndex BfdSessIndexTC, bfdSessVersionNumber Unsigned32, bfdSessType IANAbfdSessTypeTC, bfdSessDiscriminator Unsigned32, bfdSessRemoteDiscr Unsigned32, bfdSessDestinationUdpPort BfdCtrlDestPortNumberTC, bfdSessSourceUdpPort BfdCtrlSourcePortNumberTC, bfdSessEchoSourceUdpPort InetPortNumber, bfdSessAdminStatus INTEGER, bfdSessOperStatus INTEGER, bfdSessState IANAbfdSessStateTC, bfdSessRemoteHeardFlag TruthValue, bfdSessDiag IANAbfdDiagTC, bfdSessOperMode IANAbfdSessOperModeTC, bfdSessDemandModeDesiredFlag TruthValue, bfdSessControlPlaneIndepFlag TruthValue, bfdSessMultipointFlag TruthValue, bfdSessInterface InterfaceIndexOrZero, bfdSessSrcAddrType InetAddressType, bfdSessSrcAddr InetAddress, bfdSessDstAddrType InetAddressType, bfdSessDstAddr InetAddress, bfdSessGTSM TruthValue, bfdSessGTSMTTL Unsigned32, bfdSessDesiredMinTxInterval BfdIntervalTC, bfdSessReqMinRxInterval BfdIntervalTC, bfdSessReqMinEchoRxInterval BfdIntervalTC, bfdSessDetectMult BfdMultiplierTC, bfdSessNegotiatedInterval BfdIntervalTC, bfdSessNegotiatedEchoInterval BfdIntervalTC, bfdSessNegotiatedDetectMult BfdMultiplierTC, bfdSessAuthPresFlag TruthValue, bfdSessAuthenticationType IANAbfdSessAuthenticationTypeTC, bfdSessAuthenticationKeyID Integer32, bfdSessAuthenticationKey IANAbfdSessAuthenticationKeyTC, bfdSessStorageType StorageType, bfdSessRowStatus RowStatus }bfdSessIndex OBJECT-TYPE
SYNTAX BfdSessIndexTC MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object contains an index used to represent a unique BFD session on this device. Managers should obtain new values for row creation in this table by reading bfdSessIndexNext." ::= { bfdSessEntry 1 }bfdSessVersionNumber OBJECT-TYPE
SYNTAX Unsigned32 (0..7) MAX-ACCESS read-create STATUS current DESCRIPTION "The version number of the BFD protocol that this session is running in. Write access is available for this object to provide the ability to set the desired version for this BFD session." REFERENCE "RFC 5880, Bidirectional Forwarding Detection (BFD)." DEFVAL { 1 } ::= { bfdSessEntry 2 }bfdSessType OBJECT-TYPE
SYNTAX IANAbfdSessTypeTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the type of this BFD session." ::= { bfdSessEntry 3 }bfdSessDiscriminator OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295) MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the local discriminator for this BFD session, which is used to uniquely identify it." ::= { bfdSessEntry 4 }bfdSessRemoteDiscr OBJECT-TYPE
SYNTAX Unsigned32 (0 | 1..4294967295) MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the session discriminator chosen by the remote system for this BFD session. The value may be zero(0) if the remote discriminator is not yet known or if the session is in the down or adminDown(1) state." REFERENCE "Section 6.8.6 of RFC 5880, Bidirectional Forwarding Detection (BFD)." ::= { bfdSessEntry 5 }bfdSessDestinationUdpPort OBJECT-TYPE
SYNTAX BfdCtrlDestPortNumberTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the destination UDP port number used for this BFD session's Control packets. The value may be zero(0) if the session is in adminDown(1) state." DEFVAL { 0 } ::= { bfdSessEntry 6 }bfdSessSourceUdpPort OBJECT-TYPE
SYNTAX BfdCtrlSourcePortNumberTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the source UDP port number used for this BFD session's Control packets. The value may be zero(0) if the session is in adminDown(1) state. Upon creation of a new BFD session via this MIB, the value of zero(0) specified would permit the implementation to choose its own source port number." DEFVAL { 0 } ::= { bfdSessEntry 7 }bfdSessEchoSourceUdpPort OBJECT-TYPE
SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the source UDP port number used for this BFD session's Echo packets. The value may be zero(0) if the session is not running in the Echo mode, or the session is in adminDown(1) state. Upon creation of a new BFD session via this MIB, the value of zero(0) would permit the implementation to choose its own source port number." DEFVAL { 0 } ::= { bfdSessEntry 8 }bfdSessAdminStatus OBJECT-TYPE
SYNTAX INTEGER { enabled(1), disabled(2), adminDown(3), down(4) } MAX-ACCESS read-create STATUS current DESCRIPTION "Denotes the desired operational status of the BFD session.-
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A transition to enabled(1) will start the BFD state machine for the session. The state machine will have an initial state of down(2).
A transition to disabled(2) will stop the BFD state machine for the session. The state machine may first transition to adminDown(1) prior to stopping.
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A transition to adminDown(3) will cause the BFD state
machine to transition to adminDown(1) and will cause the
session to remain in this state.
A transition to down(4) will cause the BFD state machine
to transition to down(2) and will cause the session to
remain in this state.
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Care should be used in providing write access to this object without adequate authentication." ::= { bfdSessEntry 9 }bfdSessOperStatus OBJECT-TYPE
SYNTAX INTEGER { up(1), down(2), adminDown(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "Denotes the actual operational status of the BFD session. If the value of bfdOperStatus is down(2), this value MUST eventually be down(2) as well. If the value of bfdOperStatus is adminDown(3), this value MUST eventually be adminDown(3) as well." ::= { bfdSessEntry 10 }bfdSessState OBJECT-TYPE
SYNTAX IANAbfdSessStateTC MAX-ACCESS read-only STATUS current DESCRIPTION "Configured BFD session state." ::= { bfdSessEntry 11 }bfdSessRemoteHeardFlag OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the status of BFD packet reception from the remote system. Specifically, it is set to true(1) if the local system is actively receiving BFD packets from the remote system and is set to false(2) if the local system has not received BFD packets recently (within the detection time) or if the local system is attempting to tear down the BFD session." REFERENCE "RFC 5880, Bidirectional Forwarding Detection (BFD)." ::= { bfdSessEntry 12 }bfdSessDiag OBJECT-TYPE
SYNTAX IANAbfdDiagTC MAX-ACCESS read-only STATUS current DESCRIPTION "A diagnostic code specifying the local system's reason for the last transition of the session from up(4) to some other state." ::= { bfdSessEntry 13 }bfdSessOperMode OBJECT-TYPE
SYNTAX IANAbfdSessOperModeTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the operational mode of this BFD session." ::= { bfdSessEntry 14 }bfdSessDemandModeDesiredFlag OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the local system's desire to use Demand mode. Specifically, it is set to true(1) if the local system wishes to use Demand mode or false(2) if not." DEFVAL { false } ::= { bfdSessEntry 15 }bfdSessControlPlaneIndepFlag OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the local system's ability to continue to function through a disruption of the control plane. Specifically, it is set to true(1) if the local system BFD implementation is independent of the control plane. Otherwise, the value is set to false(2)." DEFVAL { false } ::= { bfdSessEntry 16 }bfdSessMultipointFlag OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the Multipoint (M) bit for this session. It is set to true(1) if the Multipoint (M) bit is set to 1. Otherwise, the value is set to false(2)." DEFVAL { false } ::= { bfdSessEntry 17 }bfdSessInterface OBJECT-TYPE
SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS current DESCRIPTION "This object contains an interface index used to indicate the interface that this BFD session is running on. This value can be zero if there is no interface associated with this BFD session." ::= { bfdSessEntry 18 }bfdSessSrcAddrType OBJECT-TYPE
SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the IP address type of the source IP address of this BFD session. The value of unknown(0) is allowed only when the session is singleHop(1) and the source IP address of this BFD session is derived from the outgoing interface, or when the BFD session is not associated with a specific interface. If any other unsupported values are attempted in a set operation, the agent MUST return an inconsistentValue error." ::= { bfdSessEntry 19 }bfdSessSrcAddr OBJECT-TYPE
SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the source IP address of this BFD session. The format of this object is controlled by the bfdSessSrcAddrType object." ::= { bfdSessEntry 20 }bfdSessDstAddrType OBJECT-TYPE
SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the IP address type of the neighboring IP address that is being monitored with this BFD session. The value of unknown(0) is allowed only when the session is singleHop(1) and the outgoing interface is of type point to point, or when the BFD session is not associated with a specific interface. If any other unsupported values are attempted in a set operation, the agent MUST return an inconsistentValue error." ::= { bfdSessEntry 21 }bfdSessDstAddr OBJECT-TYPE
SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the neighboring IP address that is being monitored with this BFD session. The format of this object is controlled by the bfdSessDstAddrType object." ::= { bfdSessEntry 22 }bfdSessGTSM OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "Setting the value of this object to false(2) will disable GTSM protection of the BFD session. GTSM MUST be enabled on a singleHop(1) session if no authentication is in use." REFERENCE "RFC 5082, The Generalized TTL Security Mechanism (GTSM). Section 5 of RFC 5881, Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)." DEFVAL { true } ::= { bfdSessEntry 23 }bfdSessGTSMTTL OBJECT-TYPE
SYNTAX Unsigned32 (0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "This object is valid only when bfdSessGTSM protection is enabled on the system. This object indicates the minimum allowed Time to Live (TTL) for received BFD Control packets. For a singleHop(1) session, if GTSM protection is enabled, this object SHOULD be set to the maximum TTL value allowed for a single hop. By default, GTSM is enabled and the TTL value is 255. For a multihop session, updating of the maximum TTL value allowed is likely required." REFERENCE "RFC 5082, The Generalized TTL Security Mechanism (GTSM). Section 5 of RFC 5881, Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)." DEFVAL { 255 } ::= { bfdSessEntry 24 }bfdSessDesiredMinTxInterval OBJECT-TYPE
SYNTAX BfdIntervalTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the minimum interval, in microseconds, that the local system would like to use when transmitting BFD Control packets. The value of zero(0) is reserved in this case and should not be used." REFERENCE "Section 4.1 of RFC 5880, Bidirectional Forwarding Detection (BFD)." ::= { bfdSessEntry 25 }bfdSessReqMinRxInterval OBJECT-TYPE
SYNTAX BfdIntervalTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the minimum interval, in microseconds, between received BFD Control packets the local system is capable of supporting. The value of zero(0) can be specified when the transmitting system does not want the remote system to send any periodic BFD Control packets." REFERENCE "Section 4.1 of RFC 5880, Bidirectional Forwarding Detection (BFD)." ::= { bfdSessEntry 26 }bfdSessReqMinEchoRxInterval OBJECT-TYPE
SYNTAX BfdIntervalTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the minimum interval, in microseconds, between received BFD Echo packets that this system is capable of supporting. The value must be zero(0) if this is a multihop BFD session." ::= { bfdSessEntry 27 }bfdSessDetectMult OBJECT-TYPE
SYNTAX BfdMultiplierTC MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the Detect time multiplier." ::= { bfdSessEntry 28 }bfdSessNegotiatedInterval OBJECT-TYPE
SYNTAX BfdIntervalTC MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the negotiated interval, in microseconds, that the local system is transmitting BFD Control packets." ::= { bfdSessEntry 29 }bfdSessNegotiatedEchoInterval OBJECT-TYPE
SYNTAX BfdIntervalTC MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the negotiated interval, in microseconds, that the local system is transmitting BFD Echo packets. The value is expected to be zero if the sessions are not running in Echo mode." ::= { bfdSessEntry 30 }bfdSessNegotiatedDetectMult OBJECT-TYPE
SYNTAX BfdMultiplierTC MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the Detect time multiplier." ::= { bfdSessEntry 31 }bfdSessAuthPresFlag OBJECT-TYPE
SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the local system's desire to use authentication. Specifically, it is set to true(1) if the local system wishes the session to be authenticated or false(2) if not." REFERENCE "Sections 4.2 - 4.4 of RFC 5880, Bidirectional Forwarding Detection (BFD)." DEFVAL { false } ::= { bfdSessEntry 32 }bfdSessAuthenticationType OBJECT-TYPE
SYNTAX IANAbfdSessAuthenticationTypeTC MAX-ACCESS read-create STATUS current DESCRIPTION "The authentication type used for this BFD session. This field is valid only when the Authentication Present bit is set. MAX-ACCESS to this object as well as other authentication-related objects are set to read-create in order to support management of a single key ID at a time; key rotation is not handled. Key update in practice must be done by atomic update using a set containing all affected objects in the same varBindList or otherwise risk the session dropping." REFERENCE "Sections 4.2 - 4.4 of RFC 5880, Bidirectional Forwarding Detection (BFD)." DEFVAL { noAuthentication } ::= { bfdSessEntry 33 }bfdSessAuthenticationKeyID OBJECT-TYPE
SYNTAX Integer32 (-1 | 0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "The authentication key ID in use for this session. This object permits multiple keys to be active simultaneously. The value -1 indicates that no authentication key ID will be present in the optional BFD Authentication Section." REFERENCE "Sections 4.2 - 4.4 of RFC 5880, Bidirectional Forwarding Detection (BFD)." DEFVAL { -1 } ::= { bfdSessEntry 34 }bfdSessAuthenticationKey OBJECT-TYPE
SYNTAX IANAbfdSessAuthenticationKeyTC MAX-ACCESS read-create STATUS current DESCRIPTION "The authentication key. When the bfdSessAuthenticationType is simplePassword(1), the value of this object is the password present in the BFD packets. When the bfdSessAuthenticationType is one of the keyed authentication types, this value is used in the computation of the key present in the BFD authentication packet." REFERENCE "Sections 4.2 - 4.4 of RFC 5880, Bidirectional Forwarding Detection (BFD)." ::= { bfdSessEntry 35 }bfdSessStorageType OBJECT-TYPE
SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "This variable indicates the storage type for this object. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row." ::= { bfdSessEntry 36 }bfdSessRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "This variable is used to create, modify, and/or delete a row in this table. When a row in this table has a row in the active(1) state, no objects in this row can be modified except the bfdSessRowStatus and bfdSessStorageType." ::= { bfdSessEntry 37 }
-- BFD Session Performance Table
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bfdSessPerfTable OBJECT-TYPE
SYNTAX SEQUENCE OF BfdSessPerfEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table specifies BFD session performance counters." ::= { bfdObjects 3 }bfdSessPerfEntry OBJECT-TYPE
SYNTAX BfdSessPerfEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in this table is created by a BFD-enabled node for every BFD session. bfdSessPerfDiscTime is used to indicate potential discontinuity for all counter objects in this table." AUGMENTS { bfdSessEntry } ::= { bfdSessPerfTable 1 }BfdSessPerfEntry ::= SEQUENCE {
bfdSessPerfCtrlPktIn Counter32, bfdSessPerfCtrlPktOut Counter32, bfdSessPerfCtrlPktDrop Counter32, bfdSessPerfCtrlPktDropLastTime TimeStamp, bfdSessPerfEchoPktIn Counter32, bfdSessPerfEchoPktOut Counter32, bfdSessPerfEchoPktDrop Counter32, bfdSessPerfEchoPktDropLastTime TimeStamp, bfdSessUpTime TimeStamp, bfdSessPerfLastSessDownTime TimeStamp, bfdSessPerfLastCommLostDiag IANAbfdDiagTC, bfdSessPerfSessUpCount Counter32, bfdSessPerfDiscTime TimeStamp, -- High Capacity Counters bfdSessPerfCtrlPktInHC Counter64, bfdSessPerfCtrlPktOutHC Counter64, bfdSessPerfCtrlPktDropHC Counter64, bfdSessPerfEchoPktInHC Counter64, bfdSessPerfEchoPktOutHC Counter64, bfdSessPerfEchoPktDropHC Counter64 }bfdSessPerfCtrlPktIn OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of BFD control messages received for this BFD session. It MUST be equal to the least significant 32 bits of bfdSessPerfCtrlPktInHC if supported, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 1 }bfdSessPerfCtrlPktOut OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of BFD control messages sent for this BFD session. It MUST be equal to the least significant 32 bits of bfdSessPerfCtrlPktOutHC if supported, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 2 }bfdSessPerfCtrlPktDrop OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of BFD control messages received for this session yet dropped for being invalid. It MUST be equal to the least significant 32 bits of bfdSessPerfCtrlPktDropHC if supported, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 3 }bfdSessPerfCtrlPktDropLastTime OBJECT-TYPE
SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which received the BFD control message for this session was dropped. If no such up event exists, this object contains a zero value." ::= { bfdSessPerfEntry 4 }bfdSessPerfEchoPktIn OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of BFD Echo messages received for this BFD session. It MUST be equal to the least significant 32 bits of bfdSessPerfEchoPktInHC if supported, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 5 }bfdSessPerfEchoPktOut OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of BFD Echo messages sent for this BFD session. It MUST be equal to the least significant 32 bits of bfdSessPerfEchoPktOutHC if supported, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 6 }bfdSessPerfEchoPktDrop OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of BFD Echo messages received for this session yet dropped for being invalid. It MUST be equal to the least significant 32 bits of bfdSessPerfEchoPktDropHC if supported, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 7 }bfdSessPerfEchoPktDropLastTime OBJECT-TYPE
SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which received the BFD Echo message for this session was dropped. If no such up event has been issued, this object contains a zero value." ::= { bfdSessPerfEntry 8 }bfdSessUpTime OBJECT-TYPE
SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which the session came up. If no such event has been issued, this object contains a zero value." ::= { bfdSessPerfEntry 9 }bfdSessPerfLastSessDownTime OBJECT-TYPE
SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which the last time communication was lost with the neighbor. If no down event has been issued, this object contains a zero value." ::= { bfdSessPerfEntry 10 }bfdSessPerfLastCommLostDiag OBJECT-TYPE
SYNTAX IANAbfdDiagTC MAX-ACCESS read-only STATUS current DESCRIPTION "The BFD diag code for the last time communication was lost with the neighbor. If such an event has not been issued, this object contains a zero value." ::= { bfdSessPerfEntry 11 }bfdSessPerfSessUpCount OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times this session has gone into the Up state since the system last rebooted." ::= { bfdSessPerfEntry 12 }bfdSessPerfDiscTime OBJECT-TYPE
SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which any one or more of the session counters suffered a discontinuity. The relevant counters are the specific instances associated with this BFD session of any Counter32 object contained in the BfdSessPerfTable. If no such discontinuities have occurred since the last reinitialization of the local management subsystem, then this object contains a zero value." ::= { bfdSessPerfEntry 13 }bfdSessPerfCtrlPktInHC OBJECT-TYPE
SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the total number of BFD control messages received for this BFD session. The least significant 32 bits MUST be equal to bfdSessPerfCtrlPktIn, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 14 }bfdSessPerfCtrlPktOutHC OBJECT-TYPE
SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the total number of BFD control messages transmitted for this BFD session. The least significant 32 bits MUST be equal to bfdSessPerfCtrlPktOut, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 15 }bfdSessPerfCtrlPktDropHC OBJECT-TYPE
SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the total number of BFD control messages received for this BFD session yet dropped for being invalid. The least significant 32 bits MUST be equal to bfdSessPerfCtrlPktDrop, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 16 }bfdSessPerfEchoPktInHC OBJECT-TYPE
SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the total number of BFD Echo messages received for this BFD session. The least significant 32 bits MUST be equal to bfdSessPerfEchoPktIn, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 17 }bfdSessPerfEchoPktOutHC OBJECT-TYPE
SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the total number of BFD Echo messages transmitted for this BFD session. The least significant 32 bits MUST be equal to bfdSessPerfEchoPktOut, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 18 }bfdSessPerfEchoPktDropHC OBJECT-TYPE
SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the total number of BFD Echo messages received for this BFD session yet dropped for being invalid. The least significant 32 bits MUST be equal to bfdSessPerfEchoPktDrop, and MUST do so with the rules spelled out in RFC 2863." ::= { bfdSessPerfEntry 19 }
-- BFD Session Discriminator Mapping Table
-
bfdSessDiscMapTable OBJECT-TYPE
SYNTAX SEQUENCE OF BfdSessDiscMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BFD Session Discriminator Mapping Table maps a local discriminator value to the associated BFD session's bfdSessIndex found in the bfdSessionTable." ::= { bfdObjects 4 }bfdSessDiscMapEntry OBJECT-TYPE
SYNTAX BfdSessDiscMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BFD Session Discriminator Mapping Entry specifies a mapping between a local discriminator and a BFD session." INDEX { bfdSessDiscriminator } ::= { bfdSessDiscMapTable 1 } BfdSessDiscMapEntry ::= SEQUENCE { bfdSessDiscMapIndex BfdSessIndexTC }bfdSessDiscMapIndex OBJECT-TYPE
SYNTAX BfdSessIndexTC MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies a mapping between a local discriminator and a BFD session in the BfdSessTable." ::= { bfdSessDiscMapEntry 1 }
-- BFD Session IP Mapping Table
-
bfdSessIpMapTable OBJECT-TYPE
SYNTAX SEQUENCE OF BfdSessIpMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BFD Session IP Mapping Table maps given bfdSessInterface, bfdSessSrcAddrType, bfdSessSrcAddr, bfdSessDstAddrType, and bfdSessDstAddr to an associated BFD session found in the bfdSessionTable." ::= { bfdObjects 5 }bfdSessIpMapEntry OBJECT-TYPE
SYNTAX BfdSessIpMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BFD Session IP Map Entry contains a mapping from the IP information for a session to the session in the bfdSessionTable." INDEX { bfdSessInterface, bfdSessSrcAddrType, bfdSessSrcAddr, bfdSessDstAddrType, bfdSessDstAddr } ::= { bfdSessIpMapTable 1 } BfdSessIpMapEntry ::= SEQUENCE { bfdSessIpMapIndex BfdSessIndexTC }bfdSessIpMapIndex OBJECT-TYPE
SYNTAX BfdSessIndexTC MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the BfdSessIndexTC referred to by the indexes of this row. In essence, a mapping is provided between these indexes and the BfdSessTable." ::= { bfdSessIpMapEntry 1 }
-- Notification Configuration
-
bfdSessUp NOTIFICATION-TYPE
OBJECTS { bfdSessDiag, -- low range value bfdSessDiag -- high range value } STATUS current DESCRIPTION "This notification is generated when the bfdSessState object for one or more contiguous entries in bfdSessTable are about to enter the up(4) state from some other state. The included values of bfdSessDiag MUST both be set equal to this new state (i.e., up(4)). The two instances of bfdSessDiag in this notification indicate the range of indexes that are affected. Note that all the indexes of the two ends of the range can be derived from the instance identifiers of these two objects. For the cases where a contiguous range of sessions have transitioned into the up(4) state at roughly the same time, the device SHOULD issue a single notification for each range of contiguous indexes in an effort to minimize the emission of a large number of notifications. If a notification has to be issued for just a single bfdSessEntry, then the instance identifier (and values) of the two bfdSessDiag objects MUST be identical." ::= { bfdNotifications 1 }bfdSessDown NOTIFICATION-TYPE
OBJECTS { bfdSessDiag, -- low range value bfdSessDiag -- high range value } STATUS current DESCRIPTION "This notification is generated when the bfdSessState object for one or more contiguous entries in bfdSessTable are about to enter the down(2) or adminDown(1) states from some other state. The included values of bfdSessDiag MUST both be set equal to this new state (i.e., down(2) or adminDown(1)). The two instances of bfdSessDiag in this notification indicate the range of indexes that are affected. Note that all the indexes of the two ends of the range can be derived from the instance identifiers of these two objects. For cases where a contiguous range of sessions have transitioned into the down(2) or adminDown(1) states at roughly the same time, the device SHOULD issue a single notification for each range of contiguous indexes in an effort to minimize the emission of a large number of notifications. If a notification has to be issued for just a single bfdSessEntry, then the instance identifier (and values) of the two bfdSessDiag objects MUST be identical." ::= { bfdNotifications 2 }
-- Module compliance.
-
bfdGroups
OBJECT IDENTIFIER ::= { bfdConformance 1 }bfdCompliances
OBJECT IDENTIFIER ::= { bfdConformance 2 }
-- Compliance requirement for fully compliant implementations.
-
bfdModuleFullCompliance MODULE-COMPLIANCE
-
STATUS current
DESCRIPTION-
"Compliance statement for agents that provide full
-
support for the BFD-MIB module. Such devices can
then be monitored and also be configured using
this MIB module."
-
-
MODULE -- This module.
MANDATORY-GROUPS { bfdSessionGroup, bfdSessionReadOnlyGroup, bfdSessionPerfGroup, bfdNotificationGroup } GROUP bfdSessionPerfHCGroup DESCRIPTION "This group is mandatory for all systems that are able to support the Counter64 date type." OBJECT bfdSessSrcAddrType SYNTAX InetAddressType { unknown(0), ipv4(1), ipv6(2), ipv6z(4) } DESCRIPTION "Only unknown(0), ipv4(1), ipv6(2), and ipv6z(4) support are required. ipv4z(3) is not required, and dns(16) is not allowed." OBJECT bfdSessSrcAddr SYNTAX InetAddress (SIZE (0|4|16|20)) DESCRIPTION "An implementation is only required to support unknown(0), ipv4(1), ipv6(2), and ipv6z(4) sizes." OBJECT bfdSessDstAddrType SYNTAX InetAddressType { unknown(0), ipv4(1), ipv6(2), ipv6z(4) } DESCRIPTION "Only unknown(0), ipv4(1), ipv6(2), and ipv6z(4) support are required. ipv4z(3) is not required, and dns(16) is not allowed." OBJECT bfdSessDstAddr SYNTAX InetAddress (SIZE (0|4|16|20)) DESCRIPTION "An implementation is only required to support unknown(0), ipv4(1), ipv6(2), and ipv6z(4) sizes." OBJECT bfdSessRowStatus SYNTAX RowStatus { active(1), notInService(2) } WRITE-SYNTAX RowStatus { active(1), notInService(2), createAndGo(4), destroy(6) } DESCRIPTION "Support for createAndWait and notReady is not required." ::= { bfdCompliances 1 }bfdModuleReadOnlyCompliance MODULE-COMPLIANCE
-
STATUS current
DESCRIPTION-
"Compliance requirement for implementations that only
-
-
provide read-only support for BFD-MIB. Such devices
can then be monitored but cannot be configured using
this MIB module."
-
-
MODULE -- This module.
MANDATORY-GROUPS { bfdSessionGroup, bfdSessionReadOnlyGroup, bfdSessionPerfGroup, bfdNotificationGroup } GROUP bfdSessionPerfHCGroup DESCRIPTION "This group is mandatory for all systems that are able to support the Counter64 date type." OBJECT bfdSessVersionNumber MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessDiscriminator MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessDestinationUdpPort MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessSourceUdpPort MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessEchoSourceUdpPort MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessAdminStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessOperMode MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessDemandModeDesiredFlag MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessControlPlaneIndepFlag MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessMultipointFlag MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessInterface MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessSrcAddrType SYNTAX InetAddressType { unknown(0), ipv4(1), ipv6(2), ipv6z(4) } MIN-ACCESS read-only DESCRIPTION "Only unknown(0), ipv4(1), ipv6(2), and ipv6z(4) support are required. ipv4z(3) is not required, and dns(16) is not allowed." OBJECT bfdSessSrcAddr SYNTAX InetAddress (SIZE (0|4|16|20)) MIN-ACCESS read-only DESCRIPTION "An implementation is only required to support unknown(0), ipv4(1), ipv6(2), and ipv6z(4) sizes." OBJECT bfdSessDstAddrType SYNTAX InetAddressType { unknown(0), ipv4(1), ipv6(2), ipv6z(4) } MIN-ACCESS read-only DESCRIPTION "Only unknown(0), ipv4(1), ipv6(2), and ipv6z(4) support are required. ipv4z(3) is not required, and dns(16) is not allowed." OBJECT bfdSessDstAddr SYNTAX InetAddress (SIZE (0|4|16|20)) MIN-ACCESS read-only DESCRIPTION "An implementation is only required to support unknown(0), ipv4(1), ipv6(2), and ipv6z(4) sizes." OBJECT bfdSessGTSM MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessGTSMTTL MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessDesiredMinTxInterval MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessReqMinRxInterval MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessReqMinEchoRxInterval MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessDetectMult MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessAuthPresFlag MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessAuthenticationType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessAuthenticationKeyID MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessAuthenticationKey MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessStorageType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT bfdSessRowStatus SYNTAX RowStatus { active(1) } MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { bfdCompliances 2 } -
-- Units of conformance.
-
bfdSessionGroup OBJECT-GROUP
-
OBJECTS {
bfdAdminStatus, bfdOperStatus, bfdNotificationsEnable, bfdSessVersionNumber, bfdSessType, bfdSessIndexNext, bfdSessDiscriminator, bfdSessDestinationUdpPort, bfdSessSourceUdpPort, bfdSessEchoSourceUdpPort, bfdSessAdminStatus, bfdSessOperStatus, bfdSessOperMode, bfdSessDemandModeDesiredFlag, bfdSessControlPlaneIndepFlag, bfdSessMultipointFlag, bfdSessInterface, bfdSessSrcAddrType, bfdSessSrcAddr, bfdSessDstAddrType, bfdSessDstAddr, bfdSessGTSM, bfdSessGTSMTTL, bfdSessDesiredMinTxInterval, bfdSessReqMinRxInterval, bfdSessReqMinEchoRxInterval, bfdSessDetectMult, bfdSessAuthPresFlag, bfdSessAuthenticationType, bfdSessAuthenticationKeyID, bfdSessAuthenticationKey, bfdSessStorageType, bfdSessRowStatus } STATUS current DESCRIPTION "Collection of objects needed for BFD sessions." ::= { bfdGroups 1 }bfdSessionReadOnlyGroup OBJECT-GROUP
OBJECTS { bfdSessRemoteDiscr, bfdSessState, bfdSessRemoteHeardFlag, bfdSessDiag, bfdSessNegotiatedInterval, bfdSessNegotiatedEchoInterval, bfdSessNegotiatedDetectMult, bfdSessDiscMapIndex, bfdSessIpMapIndex } STATUS current DESCRIPTION "Collection of read-only objects needed for BFD sessions." ::= { bfdGroups 2 }bfdSessionPerfGroup OBJECT-GROUP
-
OBJECTS {
bfdSessPerfCtrlPktIn, bfdSessPerfCtrlPktOut, bfdSessPerfCtrlPktDrop, bfdSessPerfCtrlPktDropLastTime, bfdSessPerfEchoPktIn, bfdSessPerfEchoPktOut, bfdSessPerfEchoPktDrop, bfdSessPerfEchoPktDropLastTime, bfdSessUpTime, bfdSessPerfLastSessDownTime, bfdSessPerfLastCommLostDiag, bfdSessPerfSessUpCount, bfdSessPerfDiscTime } STATUS current DESCRIPTION "Collection of objects needed to monitor the performance of BFD sessions." ::= { bfdGroups 3 }bfdSessionPerfHCGroup OBJECT-GROUP
OBJECTS { bfdSessPerfCtrlPktInHC, bfdSessPerfCtrlPktOutHC, bfdSessPerfCtrlPktDropHC, bfdSessPerfEchoPktInHC, bfdSessPerfEchoPktOutHC, bfdSessPerfEchoPktDropHC } STATUS current DESCRIPTION "Collection of objects needed to monitor the performance of BFD sessions for which the values of bfdSessPerfPktIn and bfdSessPerfPktOut wrap around too quickly." ::= { bfdGroups 4 }bfdNotificationGroup NOTIFICATION-GROUP
NOTIFICATIONS { bfdSessUp, bfdSessDown } STATUS current DESCRIPTION "Set of notifications implemented in this module." ::= { bfdGroups 5 } END
6. Security Considerations
-
As BFD may be tied into the stability of the network infrastructure (such as routing protocols), the effects of an attack on a BFD session may be very serious. This ultimately has denial-of-service effects, as links may be declared to be down (or falsely declared to be up.) As such, improper manipulation of the objects represented by this MIB may result in denial of service to a large number of end users.
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:
- bfdAdminStatus -- Improper change of bfdAdminStatus, to disabled(2), adminDown(3), or down(4), can cause significant disruption of the connectivity to those portions of the Internet reached via all the applicable remote BFD peers.
- bfdSessAdminStatus -- Improper change of bfdSessAdminStatus, to disabled(2), adminDown(3), or down(4), can cause significant disruption of the connectivity to those portions of the Internet reached via all the applicable remote BFD peers.
- bfdSessDesiredMinTxInterval, bfdSessReqMinRxInterval, bfdSessReqMinEchoRxInterval, bfdSessDetectMult -- Improper change of this object can cause connections to be disrupted for extremely long time periods when otherwise they would be restored in a relatively short period of time.
- Some management objects define the BFD session whilst other management objects define the parameter of the BFD session. It is particularly important to control the support for SET access to those management objects that define the BFD session, as changes to them can be disruptive. Implementation SHOULD NOT allow changes to following management objects when bfdSessState is up(4):
-
- bfdSessVersionNumber
- bfdSessType
- bfdSessDestinationUdpPort
- bfdSessMultipointFlag
- bfdSessInterface
- bfdSessSrcAddrType
- bfdSessSrcAddr
- bfdSessDstAddrType
- bfdSessDstAddr
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. 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.
- The bfdSessTable may be used to directly configure BFD sessions. The bfdSessMapTable can be used indirectly in the same way. Unauthorized access to objects in this table could result in disruption of traffic on the network. This is especially true if an unauthorized user configures enough tables to invoke a denial-of-service attack on the device where they are configured, or on a remote device where the sessions terminate.
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 bfdSessPerfTable allows access to the performance characteristics of BFD sessions. Network administrators not wishing to show this information should consider this table sensitive.
The bfdSessAuthenticationType, bfdSessAuthenticationKeyID, and bfdSessAuthenticationKey objects hold security methods and associated security keys of BFD sessions. These objects are highly sensitive. In order to prevent this sensitive information from being improperly accessed, implementers SHOULD disallow access to these objects.
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]), 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.
7. IANA Considerations
-
The MIB module in this document uses the following IANA-assigned OBJECT IDENTIFIER value recorded in the "SMI Network Management MGMT Codes" registry:
Descriptor OBJECT IDENTIFIER value ---------- ----------------------- bfdMIB { mib-2 222 }
8. Acknowledgments
-
The authors would like to thank Adrian Farrel and Jeffrey Haas for performing thorough reviews and providing a number of suggestions. The authors would also like to thank David Ward, Reshad Rahman, David Toscano, Sylvain Masse, Mark Tooker, Kiran Koushik Agrahara Sreenivasa, David Black, and Bert Wijnen for their comments and suggestions.
9. References
9.1. Normative References
-
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2578] McCloghrie, K., Ed., Perkins, D., Ed., and J. Schoenwaelder, Ed., "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Ed., Perkins, D., Ed., and J. Schoenwaelder, Ed., "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. [RFC5082] Gill, V., Heasley, J., Meyer, D., Savola, P., and C. Pignataro, "The Generalized TTL Security Mechanism (GTSM)", RFC 5082, October 2007. [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD)", RFC 5880, June 2010. [RFC5881] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)", RFC 5881, June 2010. [RFC5883] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD) for Multihop Paths", RFC 5883, June 2010. [RFC7130] Bhatia, M., Chen, M., Boutros, S., Binderberger, M., and J. Haas, "Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces", RFC 7130, February 2014. [RFC7330] Nadeau, T., Ali, Z., and N. Akiya, "Definitions of Textual Conventions (TCs) for Bidirectional Forwarding Detection (BFD) Management", RFC 7330, August 2014.
9.2. Informative References
-
[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. [RFC3289] Baker, F., Chan, K., and A. Smith, "Management Information Base for the Differentiated Services Architecture", RFC 3289, May 2002. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. [RFC3413] Levi, D., Meyer, P., and B. Stewart, "Simple Network Management Protocol (SNMP) Applications", STD 62, RFC 3413, December 2002.
Authors' Addresses
-
Thomas D. Nadeau
BrocadeEMail:
tnadeau@lucidvision.com
Zafar Ali
Cisco SystemsEMail:
zali@cisco.com
Nobo Akiya
Cisco SystemsEMail:
nobo@cisco.com