Internet Draft David Zelig Expires: June 2004 Corrigent Systems Thomas D. Nadeau Cisco Systems, Inc. December 2003 Ethernet Pseudo Wire (PW) Management Information Base draft-ietf-pwe3-enet-mib-03.txt Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. 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. Copyright (C) The Internet Society (2001). All rights reserved. 1 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 et al. Expires June 2004 [page 1] Ethernet Pseudo Wire (PW) December 2003 Management Information Base Table of Contents 1 Abstract.......................................................1 2 Introduction...................................................2 3 Terminology....................................................3 4 The Internet-Standard Management Framework.....................3 5 Feature Checklist..............................................3 6 PW-MIB usage...................................................3 6.1 PW-ENET-MIB usage............................................4 6.2 PW-ENET management model.....................................5 6.3 Example of MIB usage.........................................6 7 Object definitions.............................................6 8 Security considerations.......................................16 9 IANA considerations...........................................18 10 References..................................................19 10.1 Normative references........................................19 10.2 Informative references......................................20 11 Author's Addresses..........................................20 12 Full Copyright Statement....................................20 2 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 [FRARCH], 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 is used to manage the generic PW parameters common to all service, including all supported PSN types. Conventions used in this document 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]. Zelig et al Expires June 2003 [page 2] Ethernet Pseudo Wire (PW) December 2003 Management Information Base 3 Terminology This document uses terminology from the document describing the PW architecture [FRARCH] and from [PW-ENET]. 4 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]. 5 Feature Checklist The PW Ethernet MIB module (PW-ENET-MIB) is designed to satisfy the following requirements and constraints: - The MIB module is designed to be work with the PW-MIB [PW-MIB]. - The MIB module is independent of the PSN type. - The MIB module supports various options for selecting Ethernet packets into the PW. 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. - 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 such as VPLS [VPLS]. - The MIB module allow modeling of the PW as an Ethernet virtual port to be managed via existing Ethernet MIBs like Etherlike-MIB [ENETLIKE]. 6 PW-MIB usage Zelig et al Expires June 2003 [page 3] Ethernet Pseudo Wire (PW) December 2003 Management Information Base The MIB module structure for defining a PW service is composed of three layers of MIB modules functioning together. This general model is defined in the PWE3 Framework [FRMWK]. 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 such as the one defined in this document. 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 ôgluesö the standard modules to the PWE MIB modules. The next layer of the PWE MIB framework is comprised of 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 defined in other documents. This module is used to ôglueö the PW service to the underlying PSN-specific MIB modules. In the case of MPLS, for example, the PW-MPLS MIB [PWMPLSMIB] is used to connect the PW service to either the MPLS-LDP [LDPMIB] or MPLS-TE [TEMIB] MIBs. [PWTC] defines some of the object types used in these modules. The Etherlike-MIB [ENETLIKE] 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 support an option to recognize the PW as an ifIndex, enabling standard use of the Etherlike-MIB to manage the PW. 6.1 PW-ENET-MIB usage - The PW table (pwVcTable) 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 created by the operator 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 pwVcTable by a common PW index. Zelig et al Expires June 2003 [page 4] Ethernet Pseudo Wire (PW) December 2003 Management Information Base - If the PW type is Ethernet, EthernetVLAN or EthernetVPLS a row is created in pwVcEnetTable. - When using a MPLS PSN, it may be required to separate the same Ethernet services to multiple PW in order to support multiple COS on the same service. In this case, multiple PWs, each with the appropriate COS will be created to the same destination, and classification will be based also on the Ethernet PRI bits marking. The MIB allow any combinations of multiple PRI setting to PSN COS mapping (The exact PSN marking (EXP bits, DSCP etc.) is out of scope of this MIB). In these cases, pwVcEnetTable will hold multiple rows with the same Ethernet port and VLAN mapping, each PW will need to be created separately by the signaling process. 6.2 PW-ENET management model The management model for the Ethernet PW is shown in figure 1, and is based on the PW proposed layering [PWARCH]. +--------------------------------------+ | PE Device | +--------------------------------------+ Single | | | PWES | | 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 pwVcEnetPortIfIndex associate the physical CE-bound PE port ('o') to the PW (it is allowed to have multiple PWs associated to the same physical port). The operations of the forwarder are also managed by this MIB module. In some models it is convenient to model the forwarder virtual interface to a PW IWF instance ('+') as an ifIndex. As discussed in Zelig et al Expires June 2003 [page 5] Ethernet Pseudo Wire (PW) December 2003 Management Information Base the [PWMIB], this is possible by using the PW ifType in the ifTable and indicating the ifIndex in the main pwVcTable. 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, but the details are yet FFS. 6.3 Example of MIB usage TBD 7 Object definitions -- -- Ethernet PW MIB -- PW-ENET-DRAFT03-MIB DEFINITIONS ::= BEGIN IMPORTS OBJECT-TYPE, MODULE-IDENTITY, Counter64 FROM SNMPv2-SMI MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF StorageType, RowStatus, TruthValue FROM SNMPv2-TC InterfaceIndexOrZero FROM IF-MIB pwVcIndex FROM PW-DRAFT04-MIB pwStdMIB, PwVcVlanCfg, PwVcFragSize FROM PW-TC-DRAFT04-MIB; pwVcEnetMIB MODULE-IDENTITY LAST-UPDATED "200312161200Z" -- 16 December 2003 12:00:00 GMT ORGANIZATION "IETF PWE3 Working group" CONTACT-INFO "David Zelig Postal: Corrigent Systems 126, Yigal Alon St. Tel-Aviv, ISRAEL Zelig et al Expires June 2003 [page 6] Ethernet Pseudo Wire (PW) December 2003 Management Information Base Tel: +972-3-6945273 E-mail: davidz@corrigent.com Thomas D. Nadeau Postal: Cisco Systems, Inc. 250 Apollo Drive Chelmsford, MA 01824 Tel: +1-978-497-3051 Email: tnadeau@cisco.com " DESCRIPTION "This MIB describes a model for managing Ethernet point-to-point pseudo wire services over a Packet Switched Network (PSN)." -- Revision history. REVISION "200312161200Z" -- 16 December 2003 12:00:00 GMT DESCRIPTION " Changes from as draft-pwe3-enet-mib-03. 1) Module identity under the PW MIB tree. " REVISION "200307291200Z" -- 29 July 2003 12:00:00 GMT DESCRIPTION " Changes from as draft-pwe3-enet-mib-01. 1) Added Control Word status and fragmentation status. " REVISION "200209221200Z" -- 22 September 2002 12:00:00 GMT DESCRIPTION " Submitted as draft-pwe3-enet-mib-00. Changes from previous version: 1) Alignment with draft-pwe3-ethernet-encap-00.txt: removing 'rangeVLAN' mode and the associated objects. 2) Relaxing requirement on value of pwVcEnetPortVlan in port mode. " REVISION "200208201200Z" -- 20 August 2002 12:00:00 GMT DESCRIPTION "Changes from previous version: 1) Add pwVcEnetVcIfIndex - Option for VC as ifIndex. 2) Change counters to 64 bits. 3) Add mode for adding/removing VLAN fields between PW and CE bound interface. 4) Referencing draft-martini instead of draft-so. Zelig et al Expires June 2003 [page 7] Ethernet Pseudo Wire (PW) December 2003 Management Information Base 5) Editorial changes for some description clauses. 6) MPLS PRI mapping table to be independent (not augmented). 7) Adapt descriptions and rules of use to dratf-ietf-pwe3-Ethernet-encap-00. " REVISION "200202031200Z" -- 03 February 2002 12:00:00 GMT DESCRIPTION "initial revision as -00 draft" ::= { pwStdMIB 5 } -- To be assigned by IANA pwVcEnetObjects OBJECT IDENTIFIER ::= { pwVcEnetMIB 1 } pwVcEnetConformance OBJECT IDENTIFIER ::= { pwVcEnetMIB 2 } -- -- Ethernet PW table -- pwVcEnetTable OBJECT-TYPE SYNTAX SEQUENCE OF PwVcEnetEntry 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." ::= { pwVcEnetObjects 1 } pwVcEnetEntry OBJECT-TYPE SYNTAX PwVcEnetEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table is indexed by the same index that was created for the associated entry in the PW Table in the PW-STD-MIB. The PwVcIndex and the pwVcEnetPwVlan 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 pwVc table with a VcType of 'ethernetVLAN', 'ethernet' or 'ethernetVPLS'. Additional rows may be created by the operator or the agent if multiple entries are required for the same PW. This table provides Ethernet port mapping and VLAN configuration for each Ethernet PW." INDEX { pwVcIndex, pwVcEnetPwVlan } ::= { pwVcEnetTable 1 } Zelig et al Expires June 2003 [page 8] Ethernet Pseudo Wire (PW) December 2003 Management Information Base PwVcEnetEntry ::= SEQUENCE { pwVcEnetPwVlan PwVcVlanCfg, pwVcEnetVlanMode INTEGER, pwVcEnetPortVlan PwVcVlanCfg, pwVcEnetPortIfIndex InterfaceIndexOrZero, pwVcEnetVcIfIndex InterfaceIndexOrZero, pwVcEnetFragSize PwVcFragSize, pwVcEnetCwStatus TruthValue, pwVcEnetRowStatus RowStatus, pwVcEnetStorageType StorageType } pwVcEnetPwVlan OBJECT-TYPE SYNTAX PwVcVlanCfg MAX-ACCESS not-accessible STATUS current DESCRIPTION "This Object defines the VLAN on the PW. The value of 4097 is used if the object is not applicable, for example when mapping all packets from an Ethernet port to this PW. The value of 4096 is used to indicate untagged frames (at least from the PW point of view), for example if pwVcEnetVlanMode is equal 'removeVLAN' or when pwVcEnetVlanMode equal 'noChange' and pwVcEnetPortVlan is equal 4096." ::= { pwVcEnetEntry 1 } pwVcEnetVlanMode OBJECT-TYPE SYNTAX INTEGER { other(0), portBased(1), noChange(2), changeVlan(3), addVlan(4), removeVlan(5) } MAX-ACCESS read-create STATUS current DESCRIPTION "Indicate the mode of VLAN handling between the port associated to the PW and the PW encapsulation itself. - 'other' indicate operation that is not defined by this MIB. - 'portBased' indicates that the forwarder will forward packets between the port and the PW independent of their Zelig et al Expires June 2003 [page 9] Ethernet Pseudo Wire (PW) December 2003 Management Information Base structure. - 'noChange' indicates that the PW contains the original user VLAN, as specified in pwVcEnetPortVlan. - 'changeVlan' indicates that the VLAN field on the PW may be different than the VLAN field on the user's port. - 'removeVlan' indicates that the encapsulation on the PW does not include the original 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. pwVcEnetPwVlan indicate the value that will be added. - 'removeVlan', 'addVlan' and 'changeVlan' implementation is not required. " DEFVAL { noChange } ::= { pwVcEnetEntry 2 } pwVcEnetPortVlan OBJECT-TYPE SYNTAX PwVcVlanCfg MAX-ACCESS read-create STATUS current DESCRIPTION "This object define the VLAN value on the physical port (or VPLS virtual port) if a change is required to the VLAN value between the PW and the physical/virtual port. The value of this object can be ignored if the whole traffic from the port is forwarded to one PW independent of the tagging on the port, but it is RECOMENDED that the value in this case will be '4097' indicating not relevant. It MUST be equal to pwVcEnetPwVlan if 'noChange' mode is used. The value 4096 indicate that no VLAN (i.e. untagged frames) on the port are associated to this PW. This allows the same behaviors as assigning 'Default VLAN' to un-tagged frames. " DEFVAL { 4097 } ::= { pwVcEnetEntry 3 } pwVcEnetVcIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create Zelig et al Expires June 2003 [page 10] Ethernet Pseudo Wire (PW) December 2003 Management Information Base STATUS current DESCRIPTION "It is sometimes convenient to model the PW as a virtual interface in the ifTable. In these cases this object hold the value of the ifIndex in the ifTable representing this PW. A value of zero indicate no such association or association is not yet known." ::= { pwVcEnetEntry 4 } pwVcEnetPortIfIndex 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: 1) It is required to support multiple COS on a MPLS PSN for the same service (i.e.: a combination of ports and VLANs) by the use of multiple PW, each with a different COS. 2) There is no overlap of VLAN values specified in pwVcEnetPortVlan that are associated with this port. A value of zero indicate that association to an ifIndex is not yet known." ::= { pwVcEnetEntry 5 } pwVcEnetFragSize OBJECT-TYPE SYNTAX PwVcFragSize MAX-ACCESS read-only STATUS current DESCRIPTION "This object represent the status of the frgamantation negotiation (or manula configuration) for this PW. Value of zero indicate no fragmantation. If the value is not zero, recieved packets greater than pwVcEnetFragSize should be fragmented to the specified length. " ::= { pwVcEnetEntry 6 } pwVcEnetCwStatus OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only Zelig et al Expires June 2003 [page 11] Ethernet Pseudo Wire (PW) December 2003 Management Information Base STATUS current DESCRIPTION "This object represent the status of the control word usage for this PW. " ::= { pwVcEnetEntry 7 } pwVcEnetRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Enable creating, deleting and modifying this row." ::= { pwVcEnetEntry 8 } pwVcEnetStorageType OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "Indicates the storage type of this row." ::= { pwVcEnetEntry 9 } -- -- Ethernet Primary Mapping Table -- pwVcEnetMplsPriMappingTable OBJECT-TYPE SYNTAX SEQUENCE OF PwVcEnetMplsPriMappingTableEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table may be used for MPLS PSNs if there is a need to hold multiple PW, each with different COS, for the same user service (port + PW VLAN). Such a need may arise if the MPLS network is capable of L-LSP or E-LSP without multiple COS capabilities. Each row is indexed by the pwVcIndex and indicate the PRI bits on the packet recieved from the user port (or VPLS virtual port) that are classified to this PW. Note that the EXP bit value of the PW is configured in the PW-MPLS-STD-MIB." ::= { pwVcEnetObjects 2 } pwVcEnetMplsPriMappingTableEntry OBJECT-TYPE SYNTAX PwVcEnetMplsPriMappingTableEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Each entry is created if special classification based on the PRI bits is required for this PW." Zelig et al Expires June 2003 [page 12] Ethernet Pseudo Wire (PW) December 2003 Management Information Base INDEX { pwVcIndex } ::= { pwVcEnetMplsPriMappingTable 1 } PwVcEnetMplsPriMappingTableEntry ::= SEQUENCE { pwVcEnetMplsPriMapping BITS, pwVcEnetMplsPriMappingRowStatus RowStatus, pwVcEnetMplsPriMappingStorageType StorageType } pwVcEnetMplsPriMapping OBJECT-TYPE SYNTAX BITS { pri000 (0), pri001 (1), pri010 (2), pri011 (3), pri100 (4), pri101 (5), pri110 (6), pri111 (7), untagged (8) } MAX-ACCESS read-create STATUS current DESCRIPTION "This object defines the groups of user PRI mapped into this PW. Each bit set indicates that this user priority is assigned to this PW. The value 'untagged' is used to indicate that untagged frames are also associated to this PW. This object allow the use of different PSN COS based on user marking of PRI bits in MPLS PSN with L-LSP or E-LSP without multiple COS support. In all other cases, the default value MUST be used. It is REQUIRED that there is no overlap on this object between rows serving the same service (port+ PW VLAN). In case of missing BIT configuration between rows to the same service, incoming packets with PRI marking not configured should be handled by the PW with the lowest COS. " REFERENCE "See appendix A of for mapping rules of the PRI bits to PSN COS." ::= { pwVcEnetMplsPriMappingTableEntry 1 } Zelig et al Expires June 2003 [page 13] Ethernet Pseudo Wire (PW) December 2003 Management Information Base pwVcEnetMplsPriMappingRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "Enable creating, deleting and modifying this row." -- TBD: Need to specify exact interaction with other tables, and -- when rows can/cannot be created/deleted/modified. ::= { pwVcEnetMplsPriMappingTableEntry 2 } pwVcEnetMplsPriMappingStorageType OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "Indicates the storage type of this row." ::= { pwVcEnetMplsPriMappingTableEntry 3 } -- -- Ethernet PW Statistics Table -- pwVcEnetStatsTable OBJECT-TYPE SYNTAX SEQUENCE OF PwVcEnetStatsEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains statistical counters specific for Ethernet PW." ::= { pwVcEnetObjects 3 } pwVcEnetStatsEntry OBJECT-TYPE SYNTAX PwVcEnetStatsEntry 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 pwVcEnetTable." INDEX { pwVcIndex } ::= { pwVcEnetStatsTable 1 } PwVcEnetStatsEntry ::= SEQUENCE { pwVcEnetStatsIllegalVlan Counter64, pwVcEnetStatsIllegalLength Counter64 } pwVcEnetStatsIllegalVlan OBJECT-TYPE SYNTAX Counter64 Zelig et al Expires June 2003 [page 14] Ethernet Pseudo Wire (PW) December 2003 Management Information Base MAX-ACCESS read-write 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 is not relevant if the PW type is 'ethernet' (i.e. raw mode), and should be set to 0 by the agent to indicate this." ::= { pwVcEnetStatsEntry 1 } pwVcEnetStatsIllegalLength OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-write 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 maximum MTU supported, or shorter than the allowed Ethernet packet size." ::= { pwVcEnetStatsEntry 2 } --- --- Conformance description --- In this version of the draft, only objects level conformance is --- defined. More detailed conformance specifications is FFS. --- pwVcEnetGroups OBJECT IDENTIFIER ::= { pwVcEnetConformance 1 } pwVcEnetCompliances OBJECT IDENTIFIER ::= { pwVcEnetConformance 2 } pwVcEnetModuleCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for agent that support Ethernet PW." MODULE -- this module MANDATORY-GROUPS { pwVcEnetGroup, pwVcStatsGroup } GROUP pwVcEnetMplsPriGroup DESCRIPTION "Collection of objects defining classification to different PW based on the user's PRI bits mapping. This group is optional, and should be implemented only for MPLS PSN where only L-LSP or single OA E-LSP, exists, and different PSN COS is required based on the PRI mapping." Zelig et al Expires June 2003 [page 15] Ethernet Pseudo Wire (PW) December 2003 Management Information Base ::= { pwVcEnetCompliances 1 } -- Units of conformance. pwVcEnetGroup OBJECT-GROUP OBJECTS { pwVcEnetVlanMode, pwVcEnetPortVlan, pwVcEnetPortIfIndex, pwVcEnetVcIfIndex, pwVcEnetFragSize, pwVcEnetCwStatus, pwVcEnetRowStatus, pwVcEnetStorageType } STATUS current DESCRIPTION "Collection of objects for basic Ethernet PW config." ::= { pwVcEnetGroups 1 } pwVcStatsGroup OBJECT-GROUP OBJECTS { pwVcEnetStatsIllegalVlan, pwVcEnetStatsIllegalLength } STATUS current DESCRIPTION "Collection of objects counting various PW level errors." ::= { pwVcEnetGroups 2 } pwVcEnetMplsPriGroup OBJECT-GROUP OBJECTS { pwVcEnetMplsPriMapping, pwVcEnetMplsPriMappingRowStatus, pwVcEnetMplsPriMappingStorageType } STATUS current DESCRIPTION "Collection of objects defining classification to different PW based on the user's PRI bits mapping. This group is optional, and should be implemented only for MPLS PSN where only L-LSP or single OA E-LSP exists, and different PSN COS is required based on the PRI mapping." ::= { pwVcEnetGroups 3 } END 8 Security considerations Zelig et al Expires June 2003 [page 16] Ethernet Pseudo Wire (PW) December 2003 Management Information Base It is clear that this MIB module is potentially useful for monitoring of PW capable PEs. This MIB can also be used for configuration of certain objects, and anything that can be configured can be incorrectly configured, with potentially disastrous results. There are a number of management objects defined in this MIB module with a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These are the tables and objects and their sensitivity/vulnerability: o the pwVcEnetTable and pwVcEnetMplsPriMappingTable contains objects to configure Ethernet PW parameters on a Provider Edge (PE) device. Unauthorized access to objects in this table, 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 pwVcEnetTable and pwVcEnetMplsPriMappingTable collectively show the pseudo wire connectivity topology and its performance characteristics. If an Administrator does not want to reveal this information, then these tables should be considered sensitive/vulnerable. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure "for example by using IPSec", even then, there is no control as to who on the secure network is allowed to access and GET/SET "read/change/create/delete" the objects in this MIB module. It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework "see [RFC3410], section 8", including full support for the SNMPv3 cryptographic mechanisms "for authentication and privacy". Zelig et al Expires June 2003 [page 17] Ethernet Pseudo Wire (PW) December 2003 Management Information Base 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. 9 IANA considerations As requested in the PW TC MIB [PWTCMIB], PWE3 related standards track MIB modules should be rooted under the pwStdMIB subtree. The IANA is requested to assign { pwStdMIB 5 } to the PW ENET MIB module specified in this document. Zelig et al Expires June 2003 [page 18] Ethernet Pseudo Wire (PW) December 2003 Management Information Base 0 References 10.1 Normative references [ENETPW] Martini et al, "Encapsulation Methods for Transport of Ethernet Frames Over IP/MPLS Networks", work-in- progress. [PWARCH] Bryant et al, ôPWE3 Architectureö, work-in-progress. [PWREQ] Xiao et al, "Requirements for Pseudo Wire Emulation Edge-to-Edge (PWE3)", work-in-progress. [PWLAYER] Bryant, et al., "Protocol Layering in PWE3", work-in- progress. [VPLS] Augustyn et al, "Requirements for Virtual Private LAN Services (VPLS)", work-in-progress. [PWTC] Nadeau, T., et al, "Definitions for Textual Conventions and OBJECT-IDENTITIES for Pseudo-Wires Management", work-in-progress. [PWMIB] Zelig et al, ôPseudo Wire (PW) Management Information Baseö, work-in-progress. [PWMPLSMIB] Zelig et al, ôPseudo Wire (PW) Over MPLS PSN Management Information Baseö, work-in-progress. [ENETLIKE] Flick, J., "Definitions of Managed Objects for the Ethernet-like Interface Types", work-in-progress. [IANAFamily] Internet Assigned Numbers Authority (IANA), ADDRESS FAMILY NUMBERS, (http://www.isi.edu/in- notes/iana/assignements/address-family-numbers), for MIB see: ftp://ftp.isi.edu/mib/ianaaddressfamilynumbers.mib [IFMIB] McCloghrie, K., and F. Kastenholtz, "The Interfaces Group MIB using SMIv2", RFC 2863, January 2000. [RFC2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP: 26, RFC 2434, October 1998. [BCP14] Bradner, S., "Key words for use in RFCs to Indicate requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,Rose, M. and S. Waldbusser, "Structure of Management Zelig et al Expires June 2003 [page 19] Ethernet Pseudo Wire (PW) December 2003 Management Information Base Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. 10.2 Informative references [RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart, Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. 1 Author's Addresses David Zelig Corrigent Systems 126, Yigal Alon st. Tel Aviv, ISRAEL Phone: +972-3-6945273 Email: davidz@corrigent.com Thomas D. Nadeau Cisco Systems, Inc. 250 Apollo Drive Chelmsford, MA 01824 Email: tnadeau@cisco.com 2 Full Copyright Statement Copyright (C) The Internet Society (2000). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be Zelig et al Expires June 2003 [page 20] Ethernet Pseudo Wire (PW) December 2003 Management Information Base followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. 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