Pseudo-Wire Edge-to-Edge Emulation D. Zelig, Ed. Internet-Draft Corrigent Systems Intended status: Standards Track T. Nadeau, Ed. Expires: August 30, 2007 Cisco Systems, Inc. February 26, 2007 Ethernet Pseudo-Wire (PW) Management Information Base draft-ietf-pwe3-enet-mib-10 Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 30, 2007. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract This memo defines an experimental 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 of Ethernet Pseudo-Wire (PW) services. Zelig & Nadeau Expires August 30, 2007 [Page 1] Internet-Draft PW ENET MIB February 2007 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. The Internet-Standard Management Framework . . . . . . . . . . 3 3. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. Feature Checklist . . . . . . . . . . . . . . . . . . . . . . 4 6. PW ENET MIB Module Usage . . . . . . . . . . . . . . . . . . . 5 7. PW-ENET Management Model . . . . . . . . . . . . . . . . . . . 6 8. Example of the PW-ENET MIB Module Usage . . . . . . . . . . . 7 9. Service Delimiting Modes . . . . . . . . . . . . . . . . . . . 7 10. Object Definitions . . . . . . . . . . . . . . . . . . . . . . 10 11. Security Considerations . . . . . . . . . . . . . . . . . . . 20 12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21 13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 21 13.1. Normative References . . . . . . . . . . . . . . . . . . 21 13.2. Informative References . . . . . . . . . . . . . . . . . 22 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22 Intellectual Property and Copyright Statements . . . . . . . . . . 24 Zelig & Nadeau Expires August 30, 2007 [Page 2] Internet-Draft PW ENET MIB February 2007 1. Introduction This document describes a model for managing Ethernet pseudo-wire services for transmission over a Packet Switched Network (PSN). This MIB module is generic and common to all types of PSNs supported in the PWE3 architecture [RFC3985], which describes the transport and encapsulation of L1 and L2 services over supported PSN types. In particular, the MIB module associates a port or specific VLANs on top of a physical Ethernet port or a virtual Ethernet interface (for VPLS service) to a point-to-point PW. It is complementary to the [PWMIB], which manages the generic PW parameters common to all service, including all supported PSN types. Comments should be made directly to the PWE3 mailing list at pwe3@ietf.org. 2. 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 [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,[RFC2578], STD 58, [RFC2579] and STD 58, [RFC2580]. 3. Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [BCP14]. This document adopts the definitions, acronyms and mechanisms described in [RFC3985] and [RFC3916]. Unless otherwise stated, the mechanisms of [RFC3985] apply and will not be re-described here. 4. Overview The MIB module structure for defining a PW service is composed of three layers of MIB modules functioning together. This general model Zelig & Nadeau Expires August 30, 2007 [Page 3] Internet-Draft PW ENET MIB February 2007 is defined in the PWE3 architecture [RFC3985]. The layering model is intended to sufficiently isolate PW services from the underlying PSN layer that carries the emulated service. This is done at the same time as providing a standard means for connecting any supported services to any supported PSNs. The first layer, known as the service layer, contains service- specific modules. These modules define service-specific management objects that interface or collaborate with existing MIB modules for the native version of the service. The service-specific module "glues" the standard modules to the PWE3 MIB modules. The next layer of the PWE3 MIB framework is the PW MIB module [PWMIB]. This module is used to configure general parameters of PWs that are common to all types of emulated services and PSNs. This layer is connected to the service-specific layer above, and the PSN layer below. The PSN layer provides PSN-specific modules for each type of PSN. These modules associate the PW with one or more "tunnels" that carry the service over the PSN. These modules are used to "glue" the PW service to the underlying PSN-specific MIB modules. This document defines the MIB module for PW over MPLS PSN. This module uses TCs and objects as defined in [RFC2578], [RFC2579], [RFC2580], [RFC2863], [RFC4502], [PWMIB] and [PWTC]. The Etherlike-MIB [RFC3635] does not support virtual Ethernet port, however it is sometimes desired to manage the PW as an Ethernet port via the Etherlike-MIB. This MIB module supports an option to recognize the PW as an ifIndex, enabling standard use of the Etherlike-MIB to manage the PW. 5. Feature Checklist The PW Ethernet MIB module (PW-ENET-STD-MIB) is designed to satisfy the following requirements and constraints: - The MIB module is designed to be work with the PW-STD-MIB [PWMIB]. - The MIB module is independent of the PSN type. - The MIB module supports various options for selecting Ethernet packets into the PW, as defined in [RFC4448]. These include port- based PW, VLAN-based PW, VLAN-change and adding or removing VLAN fields between the port to be emulated and the PW. Zelig & Nadeau Expires August 30, 2007 [Page 4] Internet-Draft PW ENET MIB February 2007 - In the case of an MPLS PSN, the MIB module supports the use of multiple PWs to carry the same Ethernet service. These PWs can be used to support L-LSPs or single COS E-LSPs capable PSN, when mapping of the Ethernet PRI bits to the PSN COS is required. - The MIB module enables both point-to-point Ethernet services and VPLS services as discussed in the L2VPN working group [RFC4664]. - The MIB module allows modeling of the PW as an Ethernet virtual port to be managed via existing Ethernet MIBs like Etherlike-MIB [RFC3635]. 6. PW ENET MIB Module Usage - The PW table (pwTable) is used for all PW types (ATM, FR, Ethernet, SONET, etc.). This table contains high level generic parameters related to the PW creation. A row is typically created by the operator (see [PWTC] for other options) for each PW service. - Based on the PSN type defined for the PW, rows are created in PSN specific module (for example [PWMPLSMIB]) and associated to the pwTable by the common pwIndex. - If the PW type is Ethernet or EthernetTagged a row is created by the agent in pwEnetTable. Zelig & Nadeau Expires August 30, 2007 [Page 5] Internet-Draft PW ENET MIB February 2007 7. PW-ENET Management Model The management model for the Ethernet PW is shown in Figure 1, and is based on the PW layering [RFC3985]. +--------------------------------------+ | PE Device | +--------------------------------------+ Single | | | AC | | Single | PW Instance <------>o Forwarder + PW Instance X<=========> | | | +--------------------------------------+ ^ | May be modeled as ifIndex Notation: o A physical CE-bound PE port + A PW IWF instance interface to the forwarder. X A PE PSN-bound port. Figure 1: A simple point-to-point service In the typical point-to-point service, the object pwEnetPortIfIndex associates the physical CE-bound PE port ('o') to the PW (it is allowed to have multiple PWs associated to the same physical port). This MIB module also manages some of the possible operations of the forwarder. In some models it is convenient to model the forwarder virtual interface to a PW IWF instance ('+') as an ifIndex. As discussed in the [PWMIB], this is possible by using the PW ifType in the ifTable and indicating the ifIndex in the main pwTable. In case of Ethernet PW a virtual interface of ifType = etherLike will be assigned on top of the PW interface to enable statistics gathering and statuses and other management configuration tasks via existing tools. This way, the PW instance is managed as virtual Ethernet interface in the PE. The model for using the PW in non-point-to-point applications, such as VPLS are done with the same principle in mind, except that the creation of the tables is related typically to an auto-discovery process. Zelig & Nadeau Expires August 30, 2007 [Page 6] Internet-Draft PW ENET MIB February 2007 8. Example of the PW-ENET MIB Module Usage Assume we would like to create a PW of type VLAN between two PEs, for VLAN value 5. - Follows the example in [PWMIB], except that the pwType is equal 'ethernetTagged'. - The agent creates a row in pwEnetTable and pwEnetStatsTable for the specified pwindex. The pwEnetPwInstance is automatically selected by the agent to the value of '1'. - The operator fills the following entries in the pwEnetTable: pwEnetPwVlan 5, pwEnetVlanMode noChange, pwEnetPortVlan 5, pwEnetPortIfIndex 1001, pwEnetPwIfIndex 0, -- Not managed in the -- Etherlike MIB module ... - The PW is ready for forwarding when signaling has been accomplished successfully between the two peers. 9. Service Delimiting Modes In this section we will describe how the MIB module supports point- to-point applications with various VLAN service delimiting options on the physical port and the PW modes and VLAN values. In the VPLS case the PW is attached to a virtual interface that is attached to a bridge or VPLS forwarder, and it is assumed that this bridge function would be responsible for the packet modifications between the physical port or other virtual port and the virtual port the PW is attached to. There are 3 main services that are supported by this MIB module. (1) Port mode: In this mode, the whole traffic from the port is mapped to the PW. A. In the typical application, the packet is sent to the PW as is: Zelig & Nadeau Expires August 30, 2007 [Page 7] Internet-Draft PW ENET MIB February 2007 pwEnetPwVlan 4097, pwEnetVlanMode portMode, pwEnetPortVlan 4097, pwType Ethernet, B. It is possible to add a provider tag (value 10 for example) to the packet when it is sent over the PW: pwEnetPwVlan 10, pwEnetVlanMode addVlan, pwEnetPortVlan 4097, pwType SHOULD be set to 'EthernetTagged'. (2) Single VLAN: In this mode, only the first VLAN field on the packet from the physical port is the service delimiting tag, as an example VLAN=5. The following options of processing are possible: A. One to one mapping: The service delimiting tag is kept as is on the PW. pwEnetPwVlan 5, pwEnetVlanMode noChange, pwEnetPortVlan 5, pwType SHOULD be set to 'EthernetTagged'. B. One to one mapping: The service delimiting tag changes its value (to value of 6) on the PW. pwEnetPwVlan 6, pwEnetVlanMode changeVlan, pwEnetPortVlan 5, 'EthernetTagged' SHOULD be used as the pwType. C. The service delimiting tag is removed when the packet is sent to the PW. pwEnetPwVlan 5, pwEnetVlanMode removeVlan, pwEnetPortVlan 4097, pwType SHOULD be set to 'EthernetTagged'. Zelig & Nadeau Expires August 30, 2007 [Page 8] Internet-Draft PW ENET MIB February 2007 It should be noted that this mode is also applicable when the service delimiting tag is a service provider tag (VLAN=5 in this case), and the service provider actually replace the map the traffic to a single PW independent of the packet format on top of this VLAN. D. Untagged packets mapped to a PW as is (packets with a VLAN field from the same port MAY be mapped to other PWs). pwEnetPwVlan 4096, pwEnetVlanMode noChange, pwEnetPortVlan 4096, pwType MAY equal 'Ethernet' or 'EthernetTagged'. E. Untagged packets mapped to a PW, and a VLAN field is added to the packet. pwEnetPwVlan 6, pwEnetVlanMode addVlan, pwEnetPortVlan 4096, pwType SHOULD be set to 'EthernetTagged'. F. A provider VLAN (value 10) is added to the packet coming with VLAN value 5 before it is sent to the PW. pwEnetPwVlan 10, pwEnetVlanMode addVlan, pwEnetPortVlan 5, pwType SHOULD be set to 'EthernetTagged'. (3) Nested VLAN (QinQ): When only the first VLAN is the service delimiting tag, the modes as described in 2) SHOULD be used. In other cases, i.e. the service delimiting tag is both the first VLAN and the second VLAN. The following option is supported by this MIB module. Other scenarios are considered out of the scope and should be handled by other MIB modules that manage the forwarder. Assuming the provider tag equals 5 and the (inner) VLAN equal 100, this traffic can be mapped to the PW without the provider tag by using the following configuration: Zelig & Nadeau Expires August 30, 2007 [Page 9] Internet-Draft PW ENET MIB February 2007 pwEnetPwVlan 100, pwEnetVlanMode removeVLAN, pwEnetPortVlan 5, pwType MAY equal 'Ethernet' or 'EthernetTagged', 'EthernetTagged' is RECOMMENDED. Packets of the same provider tag MAY be mapped to other PWs. 10. Object Definitions PW-ENET-STD-MIB DEFINITIONS ::= BEGIN IMPORTS OBJECT-TYPE, MODULE-IDENTITY, Unsigned32, transmission FROM SNMPv2-SMI -- [RFC2578] MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF -- [RFC2580] StorageType, RowStatus FROM SNMPv2-TC -- [RFC2579] InterfaceIndexOrZero FROM IF-MIB -- [RFC2863] ZeroBasedCounter32 FROM RMON2-MIB -- [RFC4502] pwIndex FROM PW-STD-MIB -- [PWMIB] -- RFC Editor: Please replace -- PWMIB with correct RFC # PwVlanCfg FROM PW-TC-STD-MIB; -- [PWTC] -- RFC Editor: Please replace -- PWTC with correct RFC # pwEnetStdMIB MODULE-IDENTITY LAST-UPDATED "200701311200Z" -- 31 January 2006 12:00:00 GMT ORGANIZATION "IETF PWE3 Working group" CONTACT-INFO "David Zelig E-mail: davidz@corrigent.com Zelig & Nadeau Expires August 30, 2007 [Page 10] Internet-Draft PW ENET MIB February 2007 Thomas D. Nadeau Email: tnadeau@cisco.com " DESCRIPTION "This MIB module describes a model for managing Ethernet point-to-point pseudo-wire services over a Packet Switched Network (PSN). Copyright (C) The IETF Trust (2007). This version of this MIB module is part of RFC yyyy; see the RFC itself for full legal notices. -- RFC Editor: replace yyyy with the actual RFC number and remove -- this note " -- Revision history. REVISION "200701311200Z" -- 31 January 2006 12:00:00 GMT DESCRIPTION "Initial version published as part of RFC XXXX." -- RFC Editor: Please replace XXXX with the actual RFC number and -- remove this note ::= { transmission XXXX } -- RFC Editor: Please replace -- XXXX with IANA assigned value. -- See IANA considerations section. pwEnetObjects OBJECT IDENTIFIER ::= { pwEnetStdMIB 1 } pwEnetConformance OBJECT IDENTIFIER ::= { pwEnetStdMIB 2 } -- -- Ethernet PW table -- pwEnetTable OBJECT-TYPE SYNTAX SEQUENCE OF PwEnetEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains the index to the Ethernet tables associated with this ETH PW, the VLAN configuration and VLAN mode." ::= { pwEnetObjects 1 } pwEnetEntry OBJECT-TYPE SYNTAX PwEnetEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION Zelig & Nadeau Expires August 30, 2007 [Page 11] Internet-Draft PW ENET MIB February 2007 "This table is indexed by the same index that was created for the associated entry in the PW generic table in the PW-STD-MIB module. The pwIndex and the pwEnetPwInstance are used as indexes to allow multiple VLANs to exist on the same PW. An entry is created in this table by the agent for every entry in the pwTable with a pwType of 'ethernetTagged' or 'ethernet'. Additional rows may be created by the operator or the agent if multiple entries are required for the same PW. The value of pwEnetPwInstance can be arbitrary selected to make the row unique, however implementations that know the VLAN field value when the row is created MAY use the value of the VLAN itself for better readability and backward compatibility with older versions of this MIB module. This table provides Ethernet port mapping and VLAN configuration for each Ethernet PW. Any read-create object in this table MAY be changed at any time, however change of some objects (for example pwEnetVlanMode) during PW forwarding state MAY cause traffic disruption. " INDEX { pwIndex, pwEnetPwInstance } ::= { pwEnetTable 1 } PwEnetEntry ::= SEQUENCE { pwEnetPwInstance Unsigned32, pwEnetPwVlan PwVlanCfg, pwEnetVlanMode INTEGER, pwEnetPortVlan PwVlanCfg, pwEnetPortIfIndex InterfaceIndexOrZero, pwEnetPwIfIndex InterfaceIndexOrZero, pwEnetRowStatus RowStatus, pwEnetStorageType StorageType } pwEnetPwInstance OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible Zelig & Nadeau Expires August 30, 2007 [Page 12] Internet-Draft PW ENET MIB February 2007 STATUS current DESCRIPTION "If multiple rows are mapped to the same PW, this index is used to uniquely identify the individual row. If the value of the VLAN field is known at the time of of row creation, the value of pwEnetPwVlan MAY be used for better readability and backward compatibility with older versions of this MIB module. Otherwise the value of '1' SHOULD be set to the first row for each pwIndex for better readability and in order that the management application will know in advance how to access the first row when it was created by the agent. " ::= { pwEnetEntry 1 } pwEnetPwVlan OBJECT-TYPE SYNTAX PwVlanCfg MAX-ACCESS read-create STATUS current DESCRIPTION "This Object defines the (service delimiting) VLAN field value on the PW. The value of 4097 MUST be used if the object is not applicable, for example when mapping all packets from an Ethernet port to this PW (raw mode). The value of 4096 MUST be set to indicate untagged frames (from the PW point of view), i.e. when pwEnetVlanMode equals 'noChange' and pwEnetPortVlan equals 4096." ::= { pwEnetEntry 2 } pwEnetVlanMode OBJECT-TYPE SYNTAX INTEGER { other(0), portBased(1), noChange(2), changeVlan(3), addVlan(4), removeVlan(5) } MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the mode of VLAN handling between the port or the virtual port associated to the PW and the PW encapsulation. - 'other' indicates an operation that is not defined by this MIB module. Zelig & Nadeau Expires August 30, 2007 [Page 13] Internet-Draft PW ENET MIB February 2007 - 'portBased' indicates that the forwarder will forward packets between the port and the PW independent of their structure (i.e. there is no service delimiting VLAN tags from the PE standpoint). - 'noChange' indicates that the PW contains the original user VLAN, as specified in pwEnetPortVlan, i.e. the VLAN on the PE-CE link is the service delimiting tag and is kept 'as is' on the PW. - 'changeVlan' indicates that the VLAN field on the PW may be different than the VLAN field on the user's port. The VLAN on the PE-CE link is the service delimiting tag but has a different value on the PW. - 'removeVlan' indicates that the encapsulation on the PW does not include the service delimiting VLAN field. Note that PRI bits transparency is lost in this case. - 'addVlan' indicate that a VLAN field will be added on the PSN bound direction. pwEnetPwVlan indicates the value that will be added. - Implementation of 'portsbased', 'removeVlan', 'addVlan' 'other' and 'changeVlan' is OPTIONAL. " DEFVAL { noChange } ::= { pwEnetEntry 3 } pwEnetPortVlan OBJECT-TYPE SYNTAX PwVlanCfg MAX-ACCESS read-create STATUS current DESCRIPTION "This object defines the VLAN value on the physical port (or VPLS virtual port) or a mapping of the whole port traffic to the same PW. The value of '4097' MUST be used if the whole port traffic is mapped to the same PW. Note that a pwType of 'ethernetTagged' can still be used if service delimiting tag is added on the PW (pwEnetVlanMode equals 'addVlan'). It MUST be equal to pwEnetPwVlan if pwEnetVlanMode equals 'noChange'. The value 4096 indicates that packets without a VLAN field (i.e. untagged frames) on the port are associated to this Zelig & Nadeau Expires August 30, 2007 [Page 14] Internet-Draft PW ENET MIB February 2007 PW. This allows the same behavior as assigning 'Default VLAN' to untagged frames. " DEFVAL { 4097 } ::= { pwEnetEntry 4 } pwEnetPortIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS current DESCRIPTION "This object is used to specify the ifIndex of the Ethernet port associated with this PW for point-to-point Ethernet service, or the ifIndex of the virtual interface of the VPLS instance associated with the PW if the service is VPLS. Two rows in this table can point to the same ifIndex only if there is no overlap of VLAN values specified in pwEnetPortVlan that are associated with this port. A value of zero indicates that association to an ifIndex is not yet known." ::= { pwEnetEntry 5 } pwEnetPwIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS current DESCRIPTION "If the PW is modeled as an ifIndex in the ifTable, this object indicates the value of the ifIndex representing the Ethernet PW on the PSN side in the Etherlike-MIB. Note that this value may be different from the value of pwIfIndex that represents the ifIndex of the PW for ifType 'pw'." DEFVAL { 0 } ::= { pwEnetEntry 6 } pwEnetRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "This object enables creating, deleting and modifying this row." ::= { pwEnetEntry 7 } pwEnetStorageType OBJECT-TYPE SYNTAX StorageType Zelig & Nadeau Expires August 30, 2007 [Page 15] Internet-Draft PW ENET MIB February 2007 MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the storage type of this row." DEFVAL { nonVolatile } ::= { pwEnetEntry 8 } -- -- Ethernet PW Statistics Table -- pwEnetStatsTable OBJECT-TYPE SYNTAX SEQUENCE OF PwEnetStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains statistical counters specific for Ethernet PW." ::= { pwEnetObjects 2 } pwEnetStatsEntry OBJECT-TYPE SYNTAX PwEnetStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Each entry represents the statistics gathered for the PW carrying the Ethernet packets since this PW was first created in the pwEnetTable." INDEX { pwIndex } ::= { pwEnetStatsTable 1 } PwEnetStatsEntry ::= SEQUENCE { pwEnetStatsIllegalVlan ZeroBasedCounter32, pwEnetStatsIllegalLength ZeroBasedCounter32 } pwEnetStatsIllegalVlan OBJECT-TYPE SYNTAX ZeroBasedCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets received (from the PSN) on this PW with an illegal VLAN field, missing VLAN field that was expected, or a VLAN field when it was not expected. This counter may not be applicable in some cases, and MUST return the value of zero in such a case." ::= { pwEnetStatsEntry 1 } Zelig & Nadeau Expires August 30, 2007 [Page 16] Internet-Draft PW ENET MIB February 2007 pwEnetStatsIllegalLength OBJECT-TYPE SYNTAX ZeroBasedCounter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets that were received with an illegal Ethernet packet length on this PW. An illegal length is defined as being greater than the value in the advertised MTU supported, or shorter than the allowed Ethernet packet size. The agent SHOULD start the value of this counter at the value of zero." ::= { pwEnetStatsEntry 2 } --- --- Conformance description --- pwEnetGroups OBJECT IDENTIFIER ::= { pwEnetConformance 1 } pwEnetCompliances OBJECT IDENTIFIER ::= { pwEnetConformance 2 } -- Compliance requirement for fully compliant implementations. pwEnetModuleFullCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for agents that provide full support for the PW-ENET-STD-MIB Module. Such devices can then be monitored and also be configured using this MIB module." MODULE -- this module MANDATORY-GROUPS { pwEnetGroup, pwEnetStatsGroup } OBJECT pwEnetVlanMode DESCRIPTION "An implementation MUST support at least the value noChange(2)." OBJECT pwEnetPwIfIndex MIN-ACCESS read-only DESCRIPTION "Write access and values other than zero are required only for implementations that support modeling the Ethernet PW in the Etherlike-MIB." OBJECT pwEnetRowStatus SYNTAX RowStatus { active(1), notInService(2), notReady(3) } Zelig & Nadeau Expires August 30, 2007 [Page 17] Internet-Draft PW ENET MIB February 2007 WRITE-SYNTAX RowStatus { active(1), notInService(2), createAndGo(4), destroy(6) } MIN-ACCESS read-only DESCRIPTION "Support for createAndWait is not required. Support of notReady is not required for implementations that do not support signaling. Support of read-write is not required for implementations that do not support more than one VLAN mapping to the same PW." ::= { pwEnetCompliances 1 } -- Compliance requirement for read-only compliant implementations. pwEnetModuleReadOnlyCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for agents that provide read- only support for the PW-ENET-STD-MIB Module. Such devices can then be monitored but cannot be configured using this MIB module." MODULE -- this module MANDATORY-GROUPS { pwEnetGroup, pwEnetStatsGroup } OBJECT pwEnetPwVlan MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT pwEnetVlanMode MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation MUST support at least the value noChange(2)." OBJECT pwEnetPortVlan MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT pwEnetPortIfIndex MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT pwEnetPwIfIndex MIN-ACCESS read-only Zelig & Nadeau Expires August 30, 2007 [Page 18] Internet-Draft PW ENET MIB February 2007 DESCRIPTION "Write access is not required. Values other than zero are required only for implementations that support modeling the Ethernet PW in the Etherlike-MIB." OBJECT pwEnetRowStatus SYNTAX RowStatus { active(1), notInService(2), notReady(3) } MIN-ACCESS read-only DESCRIPTION "Write access is not required. Support of notReady is not required for implementations that do not support signaling." OBJECT pwEnetStorageType MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { pwEnetCompliances 2 } -- Units of conformance. pwEnetGroup OBJECT-GROUP OBJECTS { pwEnetPwVlan, pwEnetVlanMode, pwEnetPortVlan, pwEnetPortIfIndex, pwEnetPwIfIndex, pwEnetRowStatus, pwEnetStorageType } STATUS current DESCRIPTION "Collection of objects for basic Ethernet PW configuration." ::= { pwEnetGroups 1 } pwEnetStatsGroup OBJECT-GROUP OBJECTS { pwEnetStatsIllegalVlan, pwEnetStatsIllegalLength } STATUS current DESCRIPTION "Collection of objects counting various PW level errors." ::= { pwEnetGroups 2 } END Zelig & Nadeau Expires August 30, 2007 [Page 19] Internet-Draft PW ENET MIB February 2007 11. Security Considerations It is clear that this MIB module is potentially useful for monitoring of PW capable PEs. This MIB module can also be used for configuration of certain objects, and anything that can be configured can be incorrectly configured, with potentially disastrous results. There are 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: o the pwEnetTable contains objects to provision Ethernet PWs. Unauthorized access to objects in these tables, could result in disruption of traffic on the network. The use of stronger mechanisms such as SNMPv3 security should be considered where possible. Specifically, SNMPv3 VACM and USM MUST be used with any v3 agent which implements this MIB module. Administrators should consider whether read access to these objects should be allowed, since read access may be undesirable under certain circumstances. Some of the readable objects in this MIB module, i.e., objects with a MAX-ACCESS other than not-accessible, may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability: o the pwEnetTable shows the Ethernet PW service configuration. If an Administrator does not want to reveal this information, then these tables should be considered sensitive/vulnerable. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure, for example by using IPSec, even then, there is no control as to who on the secure network is allowed to access and GET/SET "read/change/create/delete" the objects in this MIB module. It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework "see [RFC3410], section 8", including full support for the SNMPv3 cryptographic mechanisms "for authentication and privacy". Further, deployment of SNMP versions prior to SNMPv3 is NOT Zelig & Nadeau Expires August 30, 2007 [Page 20] Internet-Draft PW ENET MIB February 2007 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 ---------- ----------------------- pwEnetStdMIB { transmission XXXX } Editor's Note (to be removed prior to publication): The IANA is requested to assign a value for "XXXX" under the 'transmission' subtree and to record the assignment in the SMI Numbers registry. When the assignment has been made, the RFC Editor is asked to replace "XXXX" (here and in the MIB module) with the assigned value and to remove this note. 13. References 13.1. Normative References [BCP14] Bradner, S., "Key words for use in RFCs to Indicate requirement Levels", BCP 14, RFC 2119, March 1997. [PWMIB] Zelig, D. and T. Nadeau, "Pseudo-Wire (PW) Management Information Base", work-in-progress . [PWTC] Nadeau, T. and D. Zelig, "Definitions for Textual Conventions and OBJECT-IDENTITIES for Pseudo-Wires Management", work-in-progress . [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. Zelig & Nadeau Expires August 30, 2007 [Page 21] Internet-Draft PW ENET MIB February 2007 [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. [RFC3635] Flick, J., "Definitions of Managed Objects for the Ethernet-like Interface Types", RFC 3635, September 2003. [RFC4448] Martini, L., Rosen, E., El-Aawar, N., and G. Heron, "Encapsulation Methods for Transport of Ethernet over MPLS Networks", RFC 4448, April 2006. [RFC4502] Waldbusser, S., "Remote Network Monitoring Management Information Base Version 2", RFC 4502, May 2006. 13.2. Informative References [PWMPLSMIB] Zelig, D. and T. Nadeau, "Pseudo-Wire (PW) Over MPLS PSN Management Information Base", work-in-progress . [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. [RFC3916] Xiao, X., McPherson, D., and P. Pate, "Requirements for Pseudo-Wire Emulation Edge-to-Edge (PWE3)", RFC 3916, September 2004. [RFC3985] Bryant, S. and P. Pate, "Pseudo Wire Emulation Edge-to- Edge (PWE3) Architecture", RFC 3985, March 2005. [RFC4664] Andersson, L. and E. Rosen, "Framework for Layer 2 Virtual Private Networks (L2VPNs)", RFC 4664, September 2006. Zelig & Nadeau Expires August 30, 2007 [Page 22] Internet-Draft PW ENET MIB February 2007 Authors' Addresses David Zelig (editor) Corrigent Systems 126, Yigal Alon St. Tel Aviv, Israel Phone: +972 3 6945 273 Email: davidz@corrigent.com Thomas D. Nadeau (editor) Cisco Systems, Inc. 250 Apollo Drive Chelmsford, MA 01824 USA Email: tnadeau@cisco.com Zelig & Nadeau Expires August 30, 2007 [Page 23] Internet-Draft PW ENET MIB February 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. 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Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgment Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Zelig & Nadeau Expires August 30, 2007 [Page 24]