CISCO-IETF-PW-ENET-MIB

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Organization: IETF PWE3 Working group

Last Updated: 2002-09-22

Category: Cisco Devices, Pseudowire

Description: Manages Ethernet pseudowire emulation over packet-switched networks for Ethernet service transport.

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What Is CISCO-IETF-PW-ENET-MIB?

CISCO-IETF-PW-ENET-MIB models Ethernet pseudowire emulation, describing how Ethernet frames are carried point-to-point over a packet-switched network (PSN) as part of the pseudowire emulation edge-to-edge (PWE3) framework, building on the base CISCO-IETF-PW-MIB. Although no specific sample objects were available for this entry, a MIB of this kind typically exposes per-pseudowire Ethernet-service attachment-circuit and forwarding attributes plus the operational/administrative status of each Ethernet PW. Its monitoring purpose is to confirm the operational state of Ethernet pseudowires — whether a given PW is up, down, or in a signaling/negotiating state — which is critical for detecting L2VPN service outages between attachment circuits. It explicitly depends on and extends CISCO-IETF-PW-MIB, which provides the base pseudowire object model this MIB specializes for Ethernet. It is deployed on Cisco provider-edge routers offering Ethernet-over-MPLS/PSN pseudowire (VPWS/EoMPLS) services. Engineers implementing or auditing this functionality typically reference the CISCO-IETF-PW-ENET-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-IETF-PW-ENET-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco provider-edge router (Ethernet pseudowire/L2VPN)

Monitoring Examples

No specific sample objects were provided for this MIB, so a concrete object-level polling scenario cannot be described honestly; based on its description, an operator would typically poll per-pseudowire operational/administrative status objects to confirm an Ethernet pseudowire between two attachment circuits is up, with a transition to a down or non-forwarding state indicating an L2VPN service outage.

What Can Be Monitored

Ethernet pseudowire operational status (per module scope)
attachment circuit state (per module scope)
PW admin state up/down (per module scope)

Imported Objects

From CISCO-IETF-PW-MIB

cpwVcIndex

OBJECT-TYPE

From CISCO-IETF-PW-TC-MIB

CpwVcVlanCfg

From CISCO-SMI

ciscoExperiment

OBJECT-IDENTITY

From IF-MIB

InterfaceIndexOrZero

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
OBJECT-TYPE
experimental

From SNMPv2-TC

RowStatus
StorageType

How to Use in IPNetwork Monitor

Example using cpwVcEnetStatsIllegalVlan OID:

Select a Cisco provider-edge router (Ethernet pseudowire/L2VPN) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cpwVcEnetStatsIllegalVlan into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of packets received (from the PSN) on this VC with an illegal VLAN field, missing VLAN field that was expected, or A VLAN field when it was not expected. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
cpwVcEnetMIB	1.3.6.1.4.1.9.10.108			This MIB describes a model for managing Ethernet point-to-point pseudo wire services over a Packet Switched Network (PSN).
cpwVcEnetNotifications	1.3.6.1.4.1.9.10.108.0
cpwVcEnetObjects	1.3.6.1.4.1.9.10.108.1
cpwVcEnetTable	1.3.6.1.4.1.9.10.108.1.1		not-accessible	This table contains the index to the Ethernet tables associated with this ETH VC, the VLAN configuration and VLAN mode.
cpwVcEnetEntry	1.3.6.1.4.1.9.10.108.1.1.1		not-accessible	This table is indexed by the same index that was created for the associated entry in the PW VC Table in the CISCO-IETF-PW-MIB. The CpwVcIndex and the cpwVcEnetPwVlan 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 cpwVc 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 VC. This table provides Ethernet port mapping and VLAN configuration for each Ethernet VC.
CPW cpwVcEnetPwVlan	1.3.6.1.4.1.9.10.108.1.1.1.1	CpwVcVlanCfg	not-accessible	This Object defines the VLAN on the VC. The value of 4097 is used if the object is not applicable, for example when mapping all packets from an Ethernet port to this VC. The value of 4096 is used to indicate untagged frames (at least from the PW point of view), for example if cpwVcEnetVlanMode is equal 'removeVLAN' or when cpwVcEnetVlanMode equal 'noChange' and cpwVcEnetPortVlan is equal 4096.
INT cpwVcEnetVlanMode	1.3.6.1.4.1.9.10.108.1.1.1.2	INTEGER	read-create	Indicate the mode of VLAN handling between the port associated to the VC and the VC 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 structure. - 'noChange' indicates that the VC contains the original user VLAN, as specified in cpwVcEnetPortVlan. - 'changeVlan' indicates that the VLAN field on the VC may be different than the VLAN field on the user's port. - 'removeVlan' indicates that the encapsulation on the VC 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. cpwVcEnetPwVlan indicate the value that will be added. - 'removeVlan', 'addVlan' and 'changeVlan' implementation is not required.
CPW cpwVcEnetPortVlan	1.3.6.1.4.1.9.10.108.1.1.1.3	CpwVcVlanCfg	read-create	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 VC and the physical/virtual port. The value of this object can be ignored if the whole traffic from the port is forwarded to one VC 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 cpwVcEnetPwVlan if 'noChange' mode is used. The value 4096 indicate that no VLAN (i.e. untagged frames) on the port are associated to this VC. This allows the same behaviors as assigning 'Default VLAN' to un-tagged frames.
NUM cpwVcEnetVcIfIndex	1.3.6.1.4.1.9.10.108.1.1.1.4	InterfaceIndexOrZero	read-create	It is sometimes convenient to model the VC PW as a virtual interface in the ifTable. In these cases this object hold the value of the ifIndex in the ifTable representing this VC PW. A value of zero indicate no such association or association is not yet known.
NUM cpwVcEnetPortIfIndex	1.3.6.1.4.1.9.10.108.1.1.1.5	InterfaceIndexOrZero	read-create	This object is used to specify the ifIndex of the ETHERNET port associated with this VC 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 VC, each with a different COS. 2) There is no overlap of VLAN values specified in cpwVcEnetPortVlan that are associated with this port. A value of zero indicate that association to an ifIndex is not yet known.
ROW cpwVcEnetRowStatus	1.3.6.1.4.1.9.10.108.1.1.1.6	RowStatus	read-create	Enable creating, deleting and modifying this row.
STO cpwVcEnetStorageType	1.3.6.1.4.1.9.10.108.1.1.1.7	StorageType	read-create	Indicates the storage type of this row.
cpwVcEnetMplsPriMappingTable	1.3.6.1.4.1.9.10.108.1.2		not-accessible	This table may be used for MPLS PSNs if there is a need to hold multiple VC, 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 cpwVcIndex and indicate the PRI bits on the packet recieved from the user port (or VPLS virtual port) that are classified to this VC. Note that the EXP bit value of the VC is configured in the CISCO-IETF-PW-MPLS-MIB.
cpwVcEnetMplsPriMappingTableEntry	1.3.6.1.4.1.9.10.108.1.2.1		not-accessible	Each entry is created if special classification based on the PRI bits is required for this VC.
BIT cpwVcEnetMplsPriMapping	1.3.6.1.4.1.9.10.108.1.2.1.1	Bits	read-create	This object defines the groups of user PRI mapped into this VC. Each bit set indicates that this user priority is assigned to this VC. The value 'untagged' is used to indicate that untagged frames are also associated to this VC. 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 VC with the lowest COS.
ROW cpwVcEnetMplsPriMappingRowStatus	1.3.6.1.4.1.9.10.108.1.2.1.2	RowStatus	read-create	Enable creating, deleting and modifying this row.
STO cpwVcEnetMplsPriMappingStorageType	1.3.6.1.4.1.9.10.108.1.2.1.3	StorageType	read-create	Indicates the storage type of this row.
cpwVcEnetStatsTable	1.3.6.1.4.1.9.10.108.1.3		not-accessible	This table contains statistical counters specific for Ethernet PW.
cpwVcEnetStatsEntry	1.3.6.1.4.1.9.10.108.1.3.1		not-accessible	Each entry represents the statistics gathered for the VC carrying the Ethernet packets since this VC was first created in the cpwVcEnetTable.
C64 cpwVcEnetStatsIllegalVlanEx	1.3.6.1.4.1.9.10.108.1.3.1.1	Counter64	read-only	The number of packets received (from the PSN) on this VC 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 VC type is 'ethernet' (i.e. raw mode), and should be set to 0 by the agent to indicate this.
C64 cpwVcEnetStatsIllegalLength	1.3.6.1.4.1.9.10.108.1.3.1.2	Counter64	read-only	The number of packets that were received with an illegal Ethernet packet length on this VC. 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.
cpwVcEnetConformance	1.3.6.1.4.1.9.10.108.2
cpwVcEnetGroups	1.3.6.1.4.1.9.10.108.2.1
cpwVcEnetGroup	1.3.6.1.4.1.9.10.108.2.1.1			Collection of objects for basic Ethernet PW config.
cpwVcStatsGroup	1.3.6.1.4.1.9.10.108.2.1.2			Collection of objects counting various PW level errors.
cpwVcEnetMplsPriGroup	1.3.6.1.4.1.9.10.108.2.1.3			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.
cpwVcEnetCompliances	1.3.6.1.4.1.9.10.108.2.2
cpwVcEnetModuleCompliance	1.3.6.1.4.1.9.10.108.2.2.1			The compliance statement for agent that support Ethernet PW.

RFC description

Manages Ethernet point-to-point pseudo wire services over Packet Switched Networks.

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Download CISCO-IETF-PW-ENET-MIB