Internet Engineering Task Force (IETF) K. Tata Request for Comments: 6527 Nokia Obsoletes: 2787 March 2012 Category: Standards Track ISSN: 2070-1721 Definitions of Managed Objects for the Virtual Router Redundancy Protocol Version 3 (VRRPv3) Abstract This specification defines a portion of the Management Information Base (MIB) for use with network management based on the Simple Network Management Protocol (SNMP). In particular, it defines objects for configuring, monitoring, and controlling routers that employ the Virtual Router Redundancy Protocol Version 3 (VRRPv3) for both IPv4 and IPv6 as defined in RFC 5798. This memo obsoletes RFC 2787. Status of This Memo 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/rfc6527. Copyright Notice Copyright (c) 2012 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. Tata Standards Track [Page 1]
RFC 6527 VRRP Unified MIB March 2012 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 1. The Internet-Standard Management Framework ......................2 2. Introduction ....................................................3 3. Terminology .....................................................3 4. Relationship to RFC 2787 ........................................3 5. Relation to Interface Group (IF-MIB) ............................3 6. Multi-Stack Implementations .....................................3 7. Interpretation of RFC 5798 ......................................3 8. VRRP MIB Structure and Design ...................................4 9. VRRP Multi-Stack Scenario .......................................4 10. Definitions ....................................................7 11. Security Considerations .......................................27 12. IANA Considerations ...........................................29 13. Normative References ..........................................29 14. Informative References ........................................30 15. Acknowledgments ...............................................31 1. The Internet-Standard Management Framework 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]. Tata Standards Track [Page 2]
RFC 6527 VRRP Unified MIB March 2012 2. Introduction This specification defines a portion of the MIB for use with SNMP- based network management. In particular, it defines objects for configuring, monitoring, and controlling routers that employ the Virtual Router Redundancy Protocol Version 3 (VRRPv3) for both IPv4 and IPv6 as defined in RFC 5798 [RFC5798]. 3. Terminology 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 RFC 2119 [RFC2119]. 4. Relationship to RFC 2787 This document obsoletes RFC 2787 [RFC2787]. The major changes in this document reflect changes in the VRRP protocol between RFC 2338 [RFC2338] and RFC 5798 [RFC5798]. This document is also updated to conform to current MIB conventions. 5. Relation to Interface Group (IF-MIB) Since a router can be participating in VRRP on one or more interfaces, "ifIndex" is used as an index into the tables defined in the VRRP MIB. This MIB module imports ifIndex from the IF-MIB. At this time, the latest version of the IF-MIB is from RFC 2863 [RFC2863]. 6. Multi-Stack Implementations This MIB module is designed to support multi-stack implementations that run VRRP over IPv4 and IPv6. The IP version, Virtual Router Identifier (VRID), and ifIndex are used to uniquely identify rows in a multi-stack implementation. 7. Interpretation of RFC 5798 During the review of this document, it emerged that there are different possible interpretations of [RFC5798]. The authors of that document and the VRRP working group were unable to reach consensus as to which interpretation is correct. This document makes the following assumption: Tata Standards Track [Page 3]
RFC 6527 VRRP Unified MIB March 2012 IPv4 and IPv6 virtual routers are treated as two separate logical entities and represented as two separate entries in the vrrpv3OperationsTable. This is required due to the undefined behavior of the protocol in [RFC5798] in a multi-stack scenario. 8. VRRP MIB Structure and Design This MIB module contains three tables: (1) The vrrpv3OperationsTable contains objects that define the operational characteristics of a VRRP router. Rows in this table correspond to instances of virtual routers. (2) The vrrpv3StatisticsTable contains the operating statistics for a VRRP router. (3) The vrrpv3AssociatedIpAddrTable contains the addresses of the virtual router(s) that a given VRRP router is backing up. Tables are indexed on ifIndex, VRID, and the IP version to uniquely identify a VRRP router. Notifications in this MIB module are controlled using the mechanisms defined in [RFC3413]. 9. VRRP Multi-Stack Scenario The following section provides examples of how some of the objects in this MIB are instantiated. KEY: ---- The labels in the following tables and diagrams correspond to the actual MIB objects as follows: if = IfIndex AddrType= vrrpv3OperationsInetAddrType VrId = vrrpv3OperationsVrId State = vrrpv3OperationsStatus Prior = vrrpv3OperationsPriority IpAddr = vrrpv3OperationsMasterIpAddr The following figure shows a hypothetical network with two VRRP routers, VR1 & VR2, configured with two virtual routers. Addresses in '()' indicate the address of the default gateway for a given host; H1 to H4 are IPv4 hosts, and H5 to H8 are IPv6 hosts. A, B, and C are IPv4 addresses, and X, Y, and Z are IPv6 addresses. In the diagram, "Interface" is used in the context defined in IF-MIB. Tata Standards Track [Page 4]
RFC 6527 VRRP Unified MIB March 2012 +------+ +------+ | VR1 | | VR2 | | | | | +------+ +------+ | | Intf = I1 Intf = I2 IP A | IP X IP B | IP Y IP C | | IP Z VRID = 1 | VRID=2 VRID=2 | VRID = 1 | | ----+------+------+-+-------+--------+--------++------+--------+--- ^ ^ ^ ^ ^ ^ ^ ^ | | | | | | | | (IP A) (IP A) (IP B) (IP B) (IP X) (IP X) (IP Y) (IP Y) | | | | | | | | +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ | H1 | | H2 | | H3 | | H4 | | H5 | | H6 | | H7 | | H8 | +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ ----- MIB Tables For VRRP Router "VR1": ----- vrrpv3OperationsTable ------------------- | if | VrId |AddrType| State | Prior |IpAddr| | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 01 | 1 | M | 255 | A | | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 01 | 2 | B | 1-254 | Y | | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 02 | 1 | B | 1-254 | B | | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 02 | 2 | M | 255 | X | | +----+------+--------+-------+-------+------+--------+ Tata Standards Track [Page 5]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3AssociatedIpAddrTable ------------------------- | if | VrId | AddrType | IP | RowStat | +----+------+----------+------+---------+ | I1 | 01 | 1 | A | active | +----+------+----------+------+---------+ | I1 | 01 | 1 | C | active | +----+------+----------+------+---------+ | I1 | 01 | 2 | Y | active | +----+------+----------+------+---------+ | I1 | 01 | 2 | Z | active | +----+------+----------+------+---------+ | I1 | 02 | 1 | B | active | +----+------+----------+------+---------+ | I1 | 02 | 2 | X | active | +----+------+----------+------+---------+ ----- MIB Tables For VRRP Router "VR2": ----- vrrpv3OperationsTable ------------------- | if | VrId |AddrType| State | Prior |IpAddr| | +----+------+--------+-------+-------+------+--(..)--+ | I2 | 01 | 1 | B | 1-254 | A | | +----+------+--------+-------+-------|------+--(..)--+ | I2 | 01 | 2 | M | 255 | Y | | +----+------+--------+-------+-------+------+--(..)--+ | I2 | 02 | 1 | M | 255 | B | | +----+------+--------+-------+-------+------+--(..)--+ | I2 | 02 | 2 | B | 1-254 | X | | +----+------+--------+-------+-------+------+--------+ Tata Standards Track [Page 6]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3AssociatedIpAddrTable ------------------------- | if | VrId |AddrType| IP | RowStat | +----+------+--------+------+---------+ | I2 | 01 | 1 | A | active | +----+------+--------+------+---------+ | I2 | 01 | 1 | C | active | +----+------+--------+------+---------+ | I2 | 01 | 2 | Y | active | +----+------+--------+------+---------+ | I2 | 01 | 2 | Z | active | +----+------+--------+------+---------+ | I2 | 02 | 1 | B | active | +----+------+--------+------+---------+ | I2 | 02 | 2 | X | active | +----+------+--------+------+---------+ NOTES: 1) For "State": M = Master; B = Backup. In the vrrpv3OperationsTable, a "priority" of 255 indicates that the respective router owns the IP address, e.g., this IP address is native to the router (i.e., "the IP Address Owner"). 10. Definitions This MIB module makes reference to the following documents [RFC2578], [RFC2579], [RFC2580], [RFC2863], and [RFC4001]. VRRPV3-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, Counter32, Integer32, mib-2, Unsigned32, Counter64, TimeTicks FROM SNMPv2-SMI -- RFC2578 TEXTUAL-CONVENTION, RowStatus, MacAddress, TruthValue, TimeStamp, TimeInterval FROM SNMPv2-TC -- RFC2579 MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF -- RFC2580 Tata Standards Track [Page 7]
RFC 6527 VRRP Unified MIB March 2012 ifIndex FROM IF-MIB -- RFC2863 InetAddressType, InetAddress FROM INET-ADDRESS-MIB; -- RFC4001 vrrpv3MIB MODULE-IDENTITY LAST-UPDATED "201202130000Z" -- Feb 13, 2012 ORGANIZATION "IETF VRRP Working Group" CONTACT-INFO "WG E-Mail: vrrp@ietf.org Editor: Kalyan Tata Nokia 313 Fairchild Dr, Mountain View, CA 94043 Tata_kalyan@yahoo.com" DESCRIPTION "This MIB describes objects used for managing Virtual Router Redundancy Protocol version 3 (VRRPv3). Copyright (c) 2012 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, 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). This version of the MIB module is part of RFC 6527. Please see the RFC for full legal notices." REVISION "201202120000Z" -- Feb 13, 2012 DESCRIPTION "Initial version as published in RFC 6527." ::= { mib-2 207 } -- Textual Conventions Vrrpv3VrIdTC ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION Tata Standards Track [Page 8]
RFC 6527 VRRP Unified MIB March 2012 "The value of the Virtual Router Identifier noted as (VRID) in RFC 5798. This, along with interface index (ifIndex) and IP version, serves to uniquely identify a virtual router on a given VRRP router." REFERENCE "RFC 5798 (Sections 3 and 5.2.3)" SYNTAX Integer32 (1..255) -- VRRPv3 MIB Groups vrrpv3Notifications OBJECT IDENTIFIER ::= { vrrpv3MIB 0 } vrrpv3Objects OBJECT IDENTIFIER ::= { vrrpv3MIB 1 } vrrpv3Conformance OBJECT IDENTIFIER ::= { vrrpv3MIB 2 } -- VRRPv3 MIB Objects vrrpv3Operations OBJECT IDENTIFIER ::= { vrrpv3Objects 1 } vrrpv3Statistics OBJECT IDENTIFIER ::= { vrrpv3Objects 2 } -- VRRPv3 Operations Table vrrpv3OperationsTable OBJECT-TYPE SYNTAX SEQUENCE OF Vrrpv3OperationsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Unified Operations table for a VRRP router that consists of a sequence (i.e., one or more conceptual rows) of 'vrrpv3OperationsEntry' items each of which describe the operational characteristics of a virtual router." ::= { vrrpv3Operations 1 } vrrpv3OperationsEntry OBJECT-TYPE SYNTAX Vrrpv3OperationsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the vrrpv3OperationsTable containing the operational characteristics of a virtual router. On a VRRP router, a given virtual router is identified by a combination of ifIndex, VRID, and the IP version. ifIndex represents an interface of the router. A row must be created with vrrpv3OperationsStatus set to initialize(1) and cannot transition to backup(2) or master(3) until Tata Standards Track [Page 9]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3OperationsRowStatus is transitioned to active(1). The information in this table is persistent and when written the entity SHOULD save the change to non- volatile storage." INDEX { ifIndex, vrrpv3OperationsVrId, vrrpv3OperationsInetAddrType } ::= { vrrpv3OperationsTable 1 } Vrrpv3OperationsEntry ::= SEQUENCE { vrrpv3OperationsVrId Vrrpv3VrIdTC, vrrpv3OperationsInetAddrType InetAddressType, vrrpv3OperationsMasterIpAddr InetAddress, vrrpv3OperationsPrimaryIpAddr InetAddress, vrrpv3OperationsVirtualMacAddr MacAddress, vrrpv3OperationsStatus INTEGER, vrrpv3OperationsPriority Unsigned32, vrrpv3OperationsAddrCount Integer32, vrrpv3OperationsAdvInterval TimeInterval, vrrpv3OperationsPreemptMode TruthValue, vrrpv3OperationsAcceptMode TruthValue, vrrpv3OperationsUpTime TimeTicks, vrrpv3OperationsRowStatus RowStatus } vrrpv3OperationsVrId OBJECT-TYPE SYNTAX Vrrpv3VrIdTC MAX-ACCESS not-accessible STATUS current DESCRIPTION Tata Standards Track [Page 10]
RFC 6527 VRRP Unified MIB March 2012 "This object contains the Virtual Router Identifier (VRID)." REFERENCE "RFC 4001" ::= { vrrpv3OperationsEntry 1 } vrrpv3OperationsInetAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "The IP address type of Vrrpv3OperationsEntry and Vrrpv3AssociatedIpAddrEntry. This value determines the type for vrrpv3OperationsMasterIpAddr, vrrpv3OperationsPrimaryIpAddr, and vrrpv3AssociatedIpAddrAddress. ipv4(1) and ipv6(2) are the only two values supported in this MIB module." REFERENCE "RFC 4001" ::= { vrrpv3OperationsEntry 2 } vrrpv3OperationsMasterIpAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The master router's real IP address. The master router would set this address to vrrpv3OperationsPrimaryIpAddr while transitioning to master state. For backup routers, this is the IP address listed as the source in the VRRP advertisement last received by this virtual router." REFERENCE "RFC 5798" ::= { vrrpv3OperationsEntry 3 } vrrpv3OperationsPrimaryIpAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "In the case where there is more than one IP Address (associated IP addresses) for a given 'ifIndex', this object is used to specify the IP address that will become the vrrpv3OperationsMasterIpAddr', should the virtual router transition from backup state to master." ::= { vrrpv3OperationsEntry 4 } Tata Standards Track [Page 11]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3OperationsVirtualMacAddr OBJECT-TYPE SYNTAX MacAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The virtual MAC address of the virtual router. Although this object can be derived from the 'vrrpv3OperationsVrId' object, it is defined so that it is easily obtainable by a management application and can be included in VRRP-related SNMP notifications." ::= { vrrpv3OperationsEntry 5 } vrrpv3OperationsStatus OBJECT-TYPE SYNTAX INTEGER { initialize(1), backup(2), master(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "The current state of the virtual router. This object has three defined values: - 'initialize', which indicates that the virtual router is waiting for a startup event. - 'backup', which indicates that the virtual router is monitoring the availability of the master router. - 'master', which indicates that the virtual router is forwarding packets for IP addresses that are associated with this router." REFERENCE "RFC 5798" ::= { vrrpv3OperationsEntry 6 } vrrpv3OperationsPriority OBJECT-TYPE SYNTAX Unsigned32 (0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the priority to be used for the virtual router master election process; higher values imply higher priority. A priority of '0', although not settable, is sent by the master router to indicate that this router has Tata Standards Track [Page 12]
RFC 6527 VRRP Unified MIB March 2012 ceased to participate in VRRP, and a backup virtual router should transition to become a new master. A priority of 255 is used for the router that owns the associated IP address(es) for VRRP over IPv4 and hence is not settable. Setting the values of this object to 0 or 255 should be rejected by the agents implementing this MIB module. For example, an SNMP agent would return 'badValue(3)' when a user tries to set the values 0 or 255 for this object." REFERENCE "RFC 5798, Section 6.1" DEFVAL { 100 } ::= { vrrpv3OperationsEntry 7 } vrrpv3OperationsAddrCount OBJECT-TYPE SYNTAX Integer32 (0..255) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of IP addresses that are associated with this virtual router. This number is equal to the number of rows in the vrrpv3AssociatedAddrTable that correspond to a given ifIndex/VRID/IP version." REFERENCE "RFC 5798, Section 6.1" ::= { vrrpv3OperationsEntry 8 } vrrpv3OperationsAdvInterval OBJECT-TYPE SYNTAX TimeInterval (1..4095) UNITS "centiseconds" MAX-ACCESS read-create STATUS current DESCRIPTION "The time interval, in centiseconds, between sending advertisement messages. Only the master router sends VRRP advertisements." REFERENCE "RFC 5798, Section 6.1" DEFVAL { 100} ::= { vrrpv3OperationsEntry 9 } vrrpv3OperationsPreemptMode OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION Tata Standards Track [Page 13]
RFC 6527 VRRP Unified MIB March 2012 "Controls whether a higher priority virtual router will preempt a lower priority master." REFERENCE "RFC 5798, Section 6.1" DEFVAL { true } ::= { vrrpv3OperationsEntry 10 } vrrpv3OperationsAcceptMode OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-create STATUS current DESCRIPTION "Controls whether a virtual router in master state will accept packets addressed to the address owner's IPv6 address as its own if it is not the IPv6 address owner. Default is false(2). This object is not relevant for rows representing VRRP over IPv4 and should be set to false(2)." DEFVAL { false } ::= { vrrpv3OperationsEntry 11 } vrrpv3OperationsUpTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "This value represents the amount of time, in TimeTicks (hundredth of a second), since this virtual router (i.e., the 'vrrpv3OperationsStatus') transitioned out of 'initialize'." REFERENCE "RFC 5798, Section 6.1" ::= { vrrpv3OperationsEntry 12 } vrrpv3OperationsRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable should be used in accordance to installation and removal conventions for conceptual rows. To create a row in this table, a manager sets this object to either createAndGo(4) or createAndWait(5). Until instances of all corresponding columns are appropriately configured, the value of the corresponding instance of the 'vrrpv3OperationsRowStatus' column will be read as notReady(3). Tata Standards Track [Page 14]
RFC 6527 VRRP Unified MIB March 2012 In particular, a newly created row cannot be made active(1) until (minimally) the corresponding instance of vrrpv3OperationsInetAddrType, vrrpv3OperationsVrId, and vrrpv3OperationsPrimaryIpAddr has been set, and there is at least one active row in the 'vrrpv3AssociatedIpAddrTable' defining an associated IP address. notInService(2) should be used to administratively bring the row down. A typical order of operation to add a row is: 1. Create a row in vrrpv3OperationsTable with createAndWait(5). 2. Create one or more corresponding rows in vrrpv3AssociatedIpAddrTable. 3. Populate the vrrpv3OperationsEntry. 4. Set vrrpv3OperationsRowStatus to active(1). A typical order of operation to delete an entry is: 1. Set vrrpv3OperationsRowStatus to notInService(2). 2. Set the corresponding rows in vrrpv3AssociatedIpAddrTable to destroy(6) to delete the entry. 3. Set vrrpv3OperationsRowStatus to destroy(6) to delete the entry." ::= { vrrpv3OperationsEntry 13 } -- VRRP Associated Address Table vrrpv3AssociatedIpAddrTable OBJECT-TYPE SYNTAX SEQUENCE OF Vrrpv3AssociatedIpAddrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The table of addresses associated with each virtual router." ::= { vrrpv3Operations 2 } vrrpv3AssociatedIpAddrEntry OBJECT-TYPE SYNTAX Vrrpv3AssociatedIpAddrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the table contains an IP address that is associated with a virtual router. The number of rows for a given IP version, VrID, and ifIndex will equal the number of IP addresses associated (e.g., backed up) Tata Standards Track [Page 15]
RFC 6527 VRRP Unified MIB March 2012 by the virtual router (equivalent to 'vrrpv3OperationsIpAddrCount'). Rows in the table cannot be modified unless the value of 'vrrpv3OperationsStatus' for the corresponding entry in the vrrpv3OperationsTable has transitioned to initialize(1). The information in this table is persistent and when written the entity SHOULD save the change to non- volatile storage." INDEX { ifIndex, vrrpv3OperationsVrId, vrrpv3OperationsInetAddrType, vrrpv3AssociatedIpAddrAddress } ::= { vrrpv3AssociatedIpAddrTable 1 } Vrrpv3AssociatedIpAddrEntry ::= SEQUENCE { vrrpv3AssociatedIpAddrAddress InetAddress, vrrpv3AssociatedIpAddrRowStatus RowStatus } vrrpv3AssociatedIpAddrAddress OBJECT-TYPE SYNTAX InetAddress (SIZE (0|4|16)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The assigned IP addresses that a virtual router is responsible for backing up. The IP address type is determined by the value of vrrpv3OperationsInetAddrType in the index of this row." REFERENCE "RFC 5798" ::= { vrrpv3AssociatedIpAddrEntry 1 } vrrpv3AssociatedIpAddrRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The row status variable, used according to installation and removal conventions for conceptual Tata Standards Track [Page 16]
RFC 6527 VRRP Unified MIB March 2012 rows. To create a row in this table, a manager sets this object to either createAndGo(4) or createAndWait(5). Setting this object to active(1) results in the addition of an associated address for a virtual router. Setting this object to notInService(2) results in administratively bringing down the row. Destroying the entry or setting it to destroy(6) removes the associated address from the virtual router. The use of other values is implementation-dependent. Implementations should not allow deletion of the last row corresponding to an active row in vrrpv3OperationsTable. Refer to the description of vrrpv3OperationsRowStatus for typical row creation and deletion scenarios." ::= { vrrpv3AssociatedIpAddrEntry 2 } -- VRRP Router Statistics vrrpv3RouterChecksumErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP packets received with an invalid VRRP checksum value. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3GlobalStatisticsDiscontinuityTime." REFERENCE "RFC 5798, Section 5.2.8" ::= { vrrpv3Statistics 1 } vrrpv3RouterVersionErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP packets received with an unknown or unsupported version number. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at Tata Standards Track [Page 17]
RFC 6527 VRRP Unified MIB March 2012 other times as indicated by the value of vrrpv3GlobalStatisticsDiscontinuityTime." REFERENCE "RFC 5798, Section 5.2.1" ::= { vrrpv3Statistics 2 } vrrpv3RouterVrIdErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP packets received with a VRID that is not valid for any virtual router on this router. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3GlobalStatisticsDiscontinuityTime." REFERENCE "RFC 5798, Section 5.2.3" ::= { vrrpv3Statistics 3 } vrrpv3GlobalStatisticsDiscontinuityTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which one of vrrpv3RouterChecksumErrors, vrrpv3RouterVersionErrors, and vrrpv3RouterVrIdErrors suffered a discontinuity. If no such discontinuities have occurred since the last re-initialization of the local management subsystem, then this object contains a zero value." ::= { vrrpv3Statistics 4 } -- VRRP Router Statistics Table vrrpv3StatisticsTable OBJECT-TYPE SYNTAX SEQUENCE OF Vrrpv3StatisticsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Table of virtual router statistics." ::= { vrrpv3Statistics 5 } Tata Standards Track [Page 18]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3StatisticsEntry OBJECT-TYPE SYNTAX Vrrpv3StatisticsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the table containing statistics information about a given virtual router." AUGMENTS { vrrpv3OperationsEntry } ::= { vrrpv3StatisticsTable 1 } Vrrpv3StatisticsEntry ::= SEQUENCE { vrrpv3StatisticsMasterTransitions Counter32, vrrpv3StatisticsNewMasterReason INTEGER, vrrpv3StatisticsRcvdAdvertisements Counter64, vrrpv3StatisticsAdvIntervalErrors Counter64, vrrpv3StatisticsIpTtlErrors Counter64, vrrpv3StatisticsProtoErrReason INTEGER, vrrpv3StatisticsRcvdPriZeroPackets Counter64, vrrpv3StatisticsSentPriZeroPackets Counter64, vrrpv3StatisticsRcvdInvalidTypePackets Counter64, vrrpv3StatisticsAddressListErrors Counter64, vrrpv3StatisticsPacketLengthErrors Counter64, vrrpv3StatisticsRowDiscontinuityTime TimeStamp, vrrpv3StatisticsRefreshRate Unsigned32 } vrrpv3StatisticsMasterTransitions OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of times that this virtual router's state has transitioned to master state. Tata Standards Track [Page 19]
RFC 6527 VRRP Unified MIB March 2012 Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." ::= { vrrpv3StatisticsEntry 1 } vrrpv3StatisticsNewMasterReason OBJECT-TYPE SYNTAX INTEGER { notMaster (0), priority (1), preempted (2), masterNoResponse (3) } MAX-ACCESS read-only STATUS current DESCRIPTION "This indicates the reason for the virtual router to transition to master state. If the virtual router never transitioned to master state, the value of this object is notMaster(0). Otherwise, this indicates the reason this virtual router transitioned to master state the last time. Used by vrrpv3NewMaster notification." ::= { vrrpv3StatisticsEntry 2 } vrrpv3StatisticsRcvdAdvertisements OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP advertisements received by this virtual router. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." ::= { vrrpv3StatisticsEntry 3 } vrrpv3StatisticsAdvIntervalErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP advertisement packets received for which the advertisement interval is Tata Standards Track [Page 20]
RFC 6527 VRRP Unified MIB March 2012 different from the vrrpv3OperationsAdvInterval configured on this virtual router. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." ::= { vrrpv3StatisticsEntry 4 } vrrpv3StatisticsIpTtlErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP packets received by the virtual router with IPv4 TTL (for VRRP over IPv4) or IPv6 Hop Limit (for VRRP over IPv6) not equal to 255. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." REFERENCE "RFC 5798, Section 5.1.1.3" ::= { vrrpv3StatisticsEntry 5 } vrrpv3StatisticsProtoErrReason OBJECT-TYPE SYNTAX INTEGER { noError (0), ipTtlError (1), versionError (2), checksumError (3), vrIdError(4) } MAX-ACCESS read-only STATUS current DESCRIPTION "This indicates the reason for the last protocol error. This SHOULD be set to noError(0) when no protocol errors are encountered. Used by vrrpv3ProtoError notification." ::= { vrrpv3StatisticsEntry 6 } vrrpv3StatisticsRcvdPriZeroPackets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION Tata Standards Track [Page 21]
RFC 6527 VRRP Unified MIB March 2012 "The total number of VRRP packets received by the virtual router with a priority of '0'. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." REFERENCE "RFC 5798, Section 5.2.4" ::= { vrrpv3StatisticsEntry 7 } vrrpv3StatisticsSentPriZeroPackets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of VRRP packets sent by the virtual router with a priority of '0'. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." REFERENCE "RFC 5798, Section 5.2.4" ::= { vrrpv3StatisticsEntry 8 } vrrpv3StatisticsRcvdInvalidTypePackets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of VRRP packets received by the virtual router with an invalid value in the 'type' field. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." ::= { vrrpv3StatisticsEntry 9 } vrrpv3StatisticsAddressListErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of packets received for which the address list does not match the locally configured list for the virtual router. Tata Standards Track [Page 22]
RFC 6527 VRRP Unified MIB March 2012 Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." ::= { vrrpv3StatisticsEntry 10 } vrrpv3StatisticsPacketLengthErrors OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of packets received with a packet length less than the length of the VRRP header. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of vrrpv3StatisticsRowDiscontinuityTime." ::= { vrrpv3StatisticsEntry 11 } vrrpv3StatisticsRowDiscontinuityTime 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 this entry's counters suffered a discontinuity. If no such discontinuities have occurred since the last re-initialization of the local management subsystem, then this object contains a zero value." ::= { vrrpv3StatisticsEntry 12 } vrrpv3StatisticsRefreshRate OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The minimum reasonable polling interval for this entry. This object provides an indication of the minimum amount of time required to update the counters in this entry." ::= { vrrpv3StatisticsEntry 13 } -- Notification Definitions -- Notifications may be controlled using SNMP-NOTIFICATION-MIB Tata Standards Track [Page 23]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3NewMaster NOTIFICATION-TYPE OBJECTS { vrrpv3OperationsMasterIpAddr, vrrpv3StatisticsNewMasterReason } STATUS current DESCRIPTION "The newMaster notification indicates that the sending agent has transitioned to master state." ::= { vrrpv3Notifications 1 } vrrpv3ProtoError NOTIFICATION-TYPE OBJECTS { vrrpv3StatisticsProtoErrReason } STATUS current DESCRIPTION "The notification indicates that the sending agent has encountered the protocol error indicated by vrrpv3StatisticsProtoErrReason." ::= { vrrpv3Notifications 2 } -- Conformance Information vrrpv3Compliances OBJECT IDENTIFIER ::= { vrrpv3Conformance 1 } vrrpv3Groups OBJECT IDENTIFIER ::= { vrrpv3Conformance 2 } -- Compliance Statements vrrpv3FullCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement" MODULE -- this module MANDATORY-GROUPS { vrrpv3OperationsGroup, vrrpv3StatisticsGroup, vrrpv3InfoGroup, vrrpv3NotificationsGroup } OBJECT vrrpv3OperationsPriority WRITE-SYNTAX Unsigned32 (1..254) DESCRIPTION "Setable values are from 1 to 254." ::= { vrrpv3Compliances 1 } vrrpv3ReadOnlyCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION Tata Standards Track [Page 24]
RFC 6527 VRRP Unified MIB March 2012 "When this MIB module is implemented without support for read-create (i.e., in read-only mode), then such an implementation can claim read-only compliance. Such a device can then be monitored, but cannot be configured with this MIB." MODULE -- this module MANDATORY-GROUPS { vrrpv3OperationsGroup, vrrpv3StatisticsGroup, vrrpv3StatisticsDiscontinuityGroup, vrrpv3InfoGroup, vrrpv3NotificationsGroup } OBJECT vrrpv3OperationsPriority MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT vrrpv3OperationsPrimaryIpAddr MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT vrrpv3OperationsAdvInterval MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT vrrpv3OperationsPreemptMode MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT vrrpv3OperationsAcceptMode MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT vrrpv3OperationsRowStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT vrrpv3AssociatedIpAddrRowStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { vrrpv3Compliances 2 } -- Conformance Groups vrrpv3OperationsGroup OBJECT-GROUP OBJECTS { Tata Standards Track [Page 25]
RFC 6527 VRRP Unified MIB March 2012 vrrpv3OperationsVirtualMacAddr, vrrpv3OperationsStatus, vrrpv3OperationsPriority, vrrpv3OperationsMasterIpAddr, vrrpv3OperationsAdvInterval, vrrpv3OperationsPreemptMode, vrrpv3OperationsAcceptMode, vrrpv3OperationsUpTime, vrrpv3OperationsRowStatus, vrrpv3OperationsAddrCount, vrrpv3OperationsPrimaryIpAddr, vrrpv3AssociatedIpAddrRowStatus } STATUS current DESCRIPTION "Conformance group for VRRPv3 operations." ::= { vrrpv3Groups 1 } vrrpv3StatisticsGroup OBJECT-GROUP OBJECTS { vrrpv3RouterChecksumErrors, vrrpv3RouterVersionErrors, vrrpv3RouterVrIdErrors, vrrpv3StatisticsMasterTransitions, vrrpv3StatisticsNewMasterReason, vrrpv3StatisticsRcvdAdvertisements, vrrpv3StatisticsAdvIntervalErrors, vrrpv3StatisticsRcvdPriZeroPackets, vrrpv3StatisticsSentPriZeroPackets, vrrpv3StatisticsRcvdInvalidTypePackets, vrrpv3StatisticsIpTtlErrors, vrrpv3StatisticsProtoErrReason, vrrpv3StatisticsAddressListErrors, vrrpv3StatisticsPacketLengthErrors, vrrpv3StatisticsRowDiscontinuityTime, vrrpv3StatisticsRefreshRate } STATUS current DESCRIPTION "Conformance group for VRRPv3 statistics." ::= { vrrpv3Groups 2 } vrrpv3StatisticsDiscontinuityGroup OBJECT-GROUP OBJECTS { vrrpv3GlobalStatisticsDiscontinuityTime } STATUS current DESCRIPTION Tata Standards Track [Page 26]
RFC 6527 VRRP Unified MIB March 2012 "Objects providing information about counter discontinuities." ::= { vrrpv3Groups 3 } vrrpv3InfoGroup OBJECT-GROUP OBJECTS { vrrpv3StatisticsProtoErrReason, vrrpv3StatisticsNewMasterReason } STATUS current DESCRIPTION "Conformance group for objects contained in VRRPv3 notifications." ::= { vrrpv3Groups 4 } vrrpv3NotificationsGroup NOTIFICATION-GROUP NOTIFICATIONS { vrrpv3NewMaster, vrrpv3ProtoError } STATUS current DESCRIPTION "The VRRP MIB Notification Group." ::= { vrrpv3Groups 5 } END 11. Security Considerations 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 objects vrrpv3OperationsPriority, vrrpv3OperationsPrimaryIpAddr, vrrpv3OperationsAdvInterval, vrrpv3OperationsPreemptMode, vrrpv3OperationsAcceptMode, vrrpv3OperationsRowStatus, and vrrpv3AssociatedIpAddrRowStatus possess the read-create attribute. Manipulation of these objects is capable of affecting the operation of a virtual router. Examples of how these objects could adversely affect the operation of a virtual router include: Tata Standards Track [Page 27]
RFC 6527 VRRP Unified MIB March 2012 o An unauthorized change to vrrpv3OperationsPriority can affect the priority used in master election, resulting in this router either becoming master when it should not, or in some other router being elected by preference. While this will disrupt the operator's plans, it will only replicate the unfortunate failure of multiple routers, and any router that does become master will be capable of filling that role. o Modification of vrrpv3OperationsPrimaryIpAddr would cause the configured router to take on an incorrect IP address if it becomes master, which would be potentially very disruptive to the network operation. o A malicious change to vrrpv3OperationsAdvInterval could either result in the configured router flooding the network with advertisements when it becomes master, or the new master not advertising frequently enough such that some routers do not learn about the new master. o vrrpv3OperationsPreemptMode controls whether this router will preempt another master router. Setting it inappropriately will at worse cause one router to be master against the operator's plans, but that router will still be qualified to operate as a master. o Setting the vrrpv3OperationsAcceptMode could prevent an IPv6-capable VRRP router from accepting packets addressed to the address owner's IPv6 address as its own even if it is not the IPv6 address owner. Although the default for this object is false(2), unauthorized setting of this object to false might restrict the function of some parts of the network. o The vrrpv3OperationsRowStatus object that could be used to disable a virtual router. While there are other columns that, if changed, could disrupt operations, they cannot be changed without first changing the RowStatus object. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), 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. Implementations MUST provide the security features described by the SNMPv3 framework (see [RFC3410]), including full support for authentication and privacy via the User-based Security Model (USM) [RFC3414] with the AES cipher algorithm [RFC3826]. Implementations MAY also provide support for the Transport Security Model (TSM) Tata Standards Track [Page 28]
RFC 6527 VRRP Unified MIB March 2012 [RFC5591] in combination with a secure transport such as SSH [RFC5592] or TLS/DTLS [RFC6353]. 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. 12. IANA Considerations The MIB module in this document uses the following IANA-assigned OBJECT IDENTIFIER values recorded in the SMI Numbers registry: Descriptor OBJECT IDENTIFIER value ---------- ----------------------- vrrpv3MIB { mib-2 207 vrrpv3MIB VRRPV3-MIB } This document obsoletes RFC 2787. Therefore, IANA has deprecated value 68 under 'mib-2', which is assigned to VRRP-MIB. 13. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [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. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. [RFC3413] Levi, D., Meyer, P., and B. Stewart, "Simple Network Management Protocol (SNMP) Applications", STD 62, RFC 3413, December 2002. Tata Standards Track [Page 29]
RFC 6527 VRRP Unified MIB March 2012 [RFC4001] Daniele, M., Haberman, B., Routhier, S., and J. Schoenwaelder, "Textual Conventions for Internet Network Addresses", RFC 4001, February 2005. [RFC5798] Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6", RFC 5798, March 2010. 14. Informative References [RFC2338] Knight, S., Weaver, D., Whipple, D., Hinden, R., Mitzel, D., Hunt, P., Higginson, P., Shand, M., and A. Lindem, "Virtual Router Redundancy Protocol", RFC 2338, April 1998. [RFC2787] Jewell, B. and D. Chuang, "Definitions of Managed Objects for the Virtual Router Redundancy Protocol", RFC 2787, March 2000. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. [RFC3414] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", STD 62, RFC 3414, December 2002. [RFC3826] Blumenthal, U., Maino, F., and K. McCloghrie, "The Advanced Encryption Standard (AES) Cipher Algorithm in the SNMP User-based Security Model", RFC 3826, June 2004. [RFC5591] Harrington, D. and W. Hardaker, "Transport Security Model for the Simple Network Management Protocol (SNMP)", RFC 5591, June 2009. [RFC5592] Harrington, D., Salowey, J., and W. Hardaker, "Secure Shell Transport Model for the Simple Network Management Protocol (SNMP)", RFC 5592, June 2009. [RFC6353] Hardaker, W., "Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)", RFC 6353, July 2011. Tata Standards Track [Page 30]
RFC 6527 VRRP Unified MIB March 2012 15. Acknowledgments Kripakaran Karlekar and Brain Jewell helped in design and initial drafts of this specification. This specification is based on RFC 2787. The authors of RFC 2787 are Brian Jewell and David Chuang. The author would also like to thank Bert Wijnen, Dave Thaler, Joan Cucchiara, Mukesh Gupta, Steve Bates, Adrian Farrel, Ben Campbell and Joel M. Halpern for taking time to review the document and provide valuable guidance. Author's Address Srinivas Kalyan Tata Nokia 313 Fairchild Dr. Mountain View, CA 94043 EMail: Tata_kalyan@yahoo.com Tata Standards Track [Page 31]