All MIBs › MPLS-CEM-MIB
Organization: Multiprotocol Label Switching (MPLS) Working Group
Last Updated: 2001-02-21
Description: MPLS-CEM-MIB module
Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.
What Is MPLS-CEM-MIB?
MPLS-CEM-MIB is a vendor-neutral IETF draft standards MIB for Circuit Emulation over MPLS (CEM), covering managed objects for emulating SONET/SDH TDM circuits across an MPLS packet network per the Malis/Vogelsang/Martini encapsulation draft. It exposes configuration and status data for circuit emulation service instances that map TDM traffic onto MPLS pseudowires, including circuit setup parameters and operational state. Its monitoring value centers on service/circuit status and performance for emulated TDM circuits, such as detecting loss of TDM signal, jitter buffer underruns, or circuit administrative/operational state changes, rather than general device hardware health. This MIB explicitly depends on the MPLS Label Switching Router (LSR) MIB and MPLS Traffic Engineering (TE) MIB drafts referenced in its description, since CEM circuits ride over MPLS label-switched paths defined by those modules. It is deployed on carrier-grade MPLS edge routers and TDM-to-packet gateways providing legacy circuit emulation services over a packet-switched core. Engineers can download the MPLS-CEM-MIB file directly to load it into their MIB browser.
IPNetwork Monitor allows you to monitor SNMP objects defined in MPLS-CEM-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
- vendor-neutral, standards-based MIB, not tied to a specific manufacturer
- MPLS edge router / TDM-to-packet circuit emulation gateway
Monitoring Examples
An operator would poll the CEM circuit table (a *CircuitTable/*CircuitEntry structure implied by the module) to check each emulated circuit's operational status and defect indications, revealing conditions like TDM signal loss or excessive packet jitter affecting the emulated SONET/SDH payload. Correlating circuit state with the underlying MPLS-LSR-MIB label switched path status helps isolate whether a fault originates in the TDM interface or the MPLS transport.
What Can Be Monitored
- emulated circuit operational status
- TDM signal loss/defect indications
- jitter buffer performance
- circuit administrative state
- underlying MPLS LSP association
This MIB depends on
Related MIBs
Imported Objects
From IF-MIB
| InterfaceIndex | |
| InterfaceIndexOrZero |
From MPLS-LSR-MIB
| MplsLSPID | |
| MplsLabel |
From MPLS-TE-MIB
| MplsLsrId | |
| MplsTunnelIndex | |
| MplsTunnelInstanceIndex |
From SNMPv2-CONF
| MODULE-COMPLIANCE | |
| NOTIFICATION-GROUP | |
| OBJECT-GROUP |
From SNMPv2-SMI
| Counter32 | |
| Counter64 | |
| Gauge32 | |
| Integer32 | |
| MODULE-IDENTITY | |
| NOTIFICATION-TYPE | |
| OBJECT-TYPE | |
| Unsigned32 | |
| experimental |
From SNMPv2-TC
| DisplayString | |
| RowStatus | |
| StorageType | |
| TEXTUAL-CONVENTION | |
| TimeStamp | |
| TruthValue |
OIDs
| OID symbolic | OID numeric | Type | Access | Description |
|---|---|---|---|---|
| mplsCemMIB | 1.3.6.1.3.9999 | This MIB contains managed object definitions for Circuit Emulation over MPLS as in: Malis, A., Vogelsang, S., and Martini, L. 'SONET/SDH Circuit Emulation Service Over MPLS ces-mpls-02.txt>, February 2001. This MIB is dependant on the MIBs as defined by T. Nadeau, C. Srinivasan, and A. Viswanathan and | ||
| mplsCemNotifications | 1.3.6.1.3.9999.0 | |||
| mplsCemNotifyPrefix | 1.3.6.1.3.9999.0.0 | |||
| NTF mplsCemVcUp | 1.3.6.1.3.9999.0.0.1 | This notification is generated when a mplsCemVcOperStatus object for one of the configured CEM VC entries is about to leave the down state and transition into some other state (but not into the notPresent state). This other state is indicated by the included value of mplsCemVcOperStatus. | ||
| NTF mplsCemVcDown | 1.3.6.1.3.9999.0.0.2 | This notification is generated when a mplsCemVcOperStatus object for one of the configured CEM VC entries is about to enter the down state and transition into some other state (but not from the notPresent state). This other state is indicated by the included value of mplsCemVcOperStatus. | ||
| NTF mplsCemVcApsFrom | 1.3.6.1.3.9999.0.0.3 | This notification is generated when the CEM VC APS mechanism has initiated a switch from the specified Index/Instance to find a 'good' CEM VC within the same group. To reduce the number of Traps, it is recommended to only generate mplsCemVcApsFrom when first initiating attempt to find a good CEM VC instance. That is, do not generate Traps if the APS mechanism is continuing to switch looking for an CEM VC group member that is good. | ||
| NTF mplsCemVcApsTo | 1.3.6.1.3.9999.0.0.4 | This notification is generated when the CEM VC APS mechanism has switched to and settled on a CEM VC Index and Instance that is 'good' (whether from a bad VC or when reverting). | ||
| mplsCemObjects | 1.3.6.1.3.9999.1 | |||
| U32 mplsCemVcIndexNext | 1.3.6.1.3.9999.1.1 | Unsigned32 | read-only | This object contains an appropriate value to be used for mplsCemVcIndex when creating entries in the mplsCemVcTable. The value 0 indicates that no unassigned entries are available. To obtain the value of mplsCemVcIndex for a new entry in the mplsCemVcTable, the manager issues a management protocol retrieval operation to obtain the current value of mplsCemVcIndex. After each retrieval operation, the agent should modify the value to reflect the next unassigned index. After a manager retrieves a value the agent will determine through its local policy when this index value will be made available for reuse. |
| mplsCemVcTable | 1.3.6.1.3.9999.1.2 | not-accessible | This table specifies information for connecting SONET paths and MPLS Tunnels. | |
| mplsCemVcEntry | 1.3.6.1.3.9999.1.2.1 | not-accessible | A row in this table represents a connection for CEM. It is indexed by : - The mplsCemVcIndex. Uniquely identifying a singular CEM connection or a group. If a group, individual CEM connections are identified by the Instance. - The mplsCemVcInstance. | |
| U32 mplsCemVcIndex | 1.3.6.1.3.9999.1.2.1.1 | Unsigned32 | accessible-for-notify | Primary index for the conceptual row identifying a group of CEM VCs. |
| U32 mplsCemVcInstance | 1.3.6.1.3.9999.1.2.1.2 | Unsigned32 | accessible-for-notify | Uniquely identifies an instance of a CEM VC. It is useful to identify multiple instances for the purpose of backup VCs. |
| NUM mplsCemVcSonetPathIfIndex | 1.3.6.1.3.9999.1.2.1.3 | InterfaceIndexOrZero | accessible-for-notify | This is a unique index within the ifTable. It represents the interface index for the SONET path. A value of zero indicates an ifIndex that has yet to be configured or has since disappeared. |
| MPL mplsCemVcLabel | 1.3.6.1.3.9999.1.2.1.4 | MplsLabel | accessible-for-notify | The incoming and outgoing label for this VC. This value is placed in the Label field of the outgoing MPLS shim header. |
| U32 mplsCemVcPriority | 1.3.6.1.3.9999.1.2.1.5 | Unsigned32 | read-create | Used when resources on a tunnel or backup tunnel are overbooked. The agent (connection admission control) can sort CEM VC entries that share an overbooked tunnel. Lower mplsCemVcPriority values have higher priority. VCs dropped will be set 'dormant' (as indicated in mplsCemVcOperStatus). |
| STR mplsCemVcName | 1.3.6.1.3.9999.1.2.1.6 | DisplayString | read-create | The canonical name assigned to the CEM VC. This name can be used to refer to the CEM VC on the LSRs console port. |
| STR mplsCemVcDescr | 1.3.6.1.3.9999.1.2.1.7 | DisplayString | read-create | A textual string containing information about the CEM VC. If there is no description this object contains a zero length string. |
| TIM mplsCemVcCreateTime | 1.3.6.1.3.9999.1.2.1.8 | TimeStamp | read-create | System time when theis CEM VC was created. |
| TIK mplsCemVcUpTime | 1.3.6.1.3.9999.1.2.1.9 | TimeTicks | read-only | Number of consecutive ticks this CEM VC has been 'up' as observed in mplsCemVcOperStatus. |
| MPL mplsCemVcInTunnelIndex | 1.3.6.1.3.9999.1.2.1.10 | MplsTunnelIndex | read-create | Part of set of indexes for inbound tunnel |
| MPL mplsCemVcInTunnelInstance | 1.3.6.1.3.9999.1.2.1.11 | MplsTunnelInstanceIndex | read-create | Part of set of indexes for inbound tunnel |
| MPL mplsCemVcInTunnelIngLSR | 1.3.6.1.3.9999.1.2.1.12 | MplsLsrId | read-create | Part of set of indexes for inbound tunnel |
| MPL mplsCemVcInTunnelLclLSR | 1.3.6.1.3.9999.1.2.1.13 | MplsLsrId | read-create | Part of set of indexes for inbound tunnel |
| MPL mplsCemVcOutTunnelIndex | 1.3.6.1.3.9999.1.2.1.14 | MplsTunnelIndex | read-create | Part of set of indexes for outbound tunnel |
| MPL mplsCemVcOutTunnelInstance | 1.3.6.1.3.9999.1.2.1.15 | MplsTunnelInstanceIndex | read-create | Part of set of indexes for outbound tunnel |
| MPL mplsCemVcOutTunnelLclLSR | 1.3.6.1.3.9999.1.2.1.16 | MplsLsrId | read-create | Part of set of indexes for outbound tunnel |
| MPL mplsCemVcOutTunnelEgrLSR | 1.3.6.1.3.9999.1.2.1.17 | MplsLsrId | read-create | Part of set of indexes for outbound tunnel |
| U32 mplsCemVcPktLength | 1.3.6.1.3.9999.1.2.1.18 | Unsigned32 | read-create | This is the packet or payload length for this CEM VC. It is fixed and applies to inbound and outbound packets carrying user payload. Note: DBA packets have their own length and are not effected by this. |
| U32 mplsCemVcExpBits | 1.3.6.1.3.9999.1.2.1.19 | Unsigned32 | read-create | This value is placed in the EXP bit field of the outbound MPLS shim header (with the VC Label). These EXP bits convey to the LSR the PHB to be applied to these packets. |
| T/F mplsCemVcPktResequence | 1.3.6.1.3.9999.1.2.1.20 | TruthValue | read-only | Reports if implementation provides packet re-sequencing. With this, as inbound packets are queued in the jitter buffer, out of order packets are re-sequenced. The maximum sequence number differential (order correction can occur within) is dependant on the depth of the jitter buffer. See mplsCemVcJtrBfrDepth. |
| BIT mplsCemVcEnableDBA | 1.3.6.1.3.9999.1.2.1.21 | Bits | read-create | Any bits set here MUST enable the DBA (dynamic bandwidth allocation) feature for the specified condition. Setting allOnesOnAis will cause CEM packet payload suppression when AIS is detected on the associated SONET path. Similarly, allZerosOnUnequipped will cause payload suppression when the SONET path is un-equipped. During these conditions, CEM packets will continue to be sent, but with indicators set in the CEM header instructing the remote to play all ones or zeros onto its SONET path. Note: some implementations may not support this feature. |
| U32 mplsCemVcJtrBfrDepth | 1.3.6.1.3.9999.1.2.1.22 | Unsigned32 | read-create | This setting configures the number of packet buffers reserved for this CEM VC. (This object would not apply in implementations that support CEM VC groups, but cannot process inbound packets on CEM VCs that are currently in standby.) This object essentially sets the maximum amount of time allowed between CEM packets before the jitter buffer empties. This variable should be set based on the SONET path width (speed) and the amount of delay variation expected to be introduced by the network. Like bandwidth, jitter buffers are likely to be a limited resource to be managed. |
| INT mplsCemVcErrorAction | 1.3.6.1.3.9999.1.2.1.23 | INTEGER | read-create | These are the actions to take when inbound packets are missing due to gap in sequence numbers (uncorrectable via available re-sequencing), jitter buffer underruns, or packets with bad CEM headers. These patterns are sent (played) on the SONET path. These settings are used for immediate errors and (unless the mplsCemVcDownAction is 'none') are not in effect once the CEM VC is 'down'. |
| INT mplsCemVcDownAction | 1.3.6.1.3.9999.1.2.1.24 | INTEGER | read-create | These are the actions to take once the CEM VC has been declared 'down' (as observed in mplsCemVcOperStatus). These patterns are sent (played) on the SONET path. See Integration Timers for events causing CEM VC 'down'. If 'errorAction' is selected, then the mplsCemVcErrorAction settings stay in effect even after the CEM VC is 'down'. |
| U32 mplsCemVcIntegrateToDown1 | 1.3.6.1.3.9999.1.2.1.25 | Unsigned32 | read-create | See comment above - units are microseconds. |
| U32 mplsCemVcIntegrateToDown2 | 1.3.6.1.3.9999.1.2.1.26 | Unsigned32 | read-create | See comment above - units are microseconds. |
| U32 mplsCemVcIntegrateToUp1 | 1.3.6.1.3.9999.1.2.1.27 | Unsigned32 | read-create | See comment above - units are microseconds. |
| U32 mplsCemVcIntegrateToUp2 | 1.3.6.1.3.9999.1.2.1.28 | Unsigned32 | read-create | See comment above - units are microseconds. |
| T/F mplsCemVcApsEnable | 1.3.6.1.3.9999.1.2.1.29 | TruthValue | read-create | Enables this CEM VC (as part of a group) to be used for APS. A CEM VC group is created when a unique CEM VC index (in mplsCemVcTable) has multiple instances. Setting mplsCemVcApsEnable to 'false' may be useful when a CEM VC is suspect, being debugged, or not fully configured. Note: some implementations may not support APS. |
| BIT mplsCemVcApsCriteria | 1.3.6.1.3.9999.1.2.1.30 | Bits | read-create | Bits set here represent defects and modes for switching the SONET path from the active CEM VC to another within this VC's group. Defects include: CEM errors (jitter buffer errors, missing packets, bad CEM headers). Separating these CEM defects into individually selectable bits, or adding other types of defect indications (e.g. OAM status) is for future study. Modes: The 'cemErrorStbyOK' mode setting is useful in APS network configurations where CEM traffic is not present on standby inbound VCs. Therefore they are expected to have CEM errors, but are still to be considered as viable switch- over candidates. cemErrorStbyOK essentially masks CEM errors when this CEM VC is in standby. 'revertive' mode is useful for non-preferred CEM VCs where you may want to switch back to a preferred VC that has no defects while the currently active VC also has no defects (see mplsCemVcApsRevertTimer). 'revertive' should NOT be used when standby VCs have no defect indications available. If 'revertive' is not set, then manual reversion is possible by simply setting the active CEM VC's admin status 'down', then 'up'. Preferred should NOT have 'revertive' set. 'hunt' mode is useful when standby VCs offer no defect indications (see mplsCemVcApsHoldOffTimer). 'hunt' should not be used when standby VCs have available defect indications. Hunting assumes standby VCs are good, if not the down timers will determine it's bad, and hunting continues. 'hunt' and 'revertive' are mutually exclusive. |
| BIT mplsCemVcDefects | 1.3.6.1.3.9999.1.2.1.31 | Bits | read-only | Current state of these CEM VC defects. The cemError indicator is a summary of any error associated with processing inbound CEM packets. Separately displaying CEM errors types (buffer errors, missing packets, and header errors) are for future study. Also other bits here may be defined here to show results of error trend analysis. These bits MUST be aligned with mplsCemVcApsCriteria bits so mplsCemVcApsCriteria can be used as a mask. Note: other defect indications (e.g. from OAM) are for future study. |
| U32 mplsCemVcApsHoldoffTimer | 1.3.6.1.3.9999.1.2.1.32 | Unsigned32 | read-create | Used to hold-off an APS switch after the CEM VC has been determined 'down'. The purpose is to allow potential recovery schemes within lower communications layers a chance to recover. Also useful in 'hunt' mode to hold off switching to the next CEM VC (slows oscillation when all VCs are down). |
| U32 mplsCemVcApsRevertTimer | 1.3.6.1.3.9999.1.2.1.33 | Unsigned32 | read-create | If this CEM VC is active and 'up', then this timer is used in conjunction with 'revertive' (if set above). The reversion would be delayed for this time. |
| INT mplsCemVcApsStatus | 1.3.6.1.3.9999.1.2.1.34 | INTEGER | read-only | If part of a CEM VC group, this indicates if the CEM VC has been selected (via APS algorithm/protocol) to connect the associated Tunnel to the SONET path. If not part of a group, then always 'active'. |
| U32 mplsCemVcLdpVcIdLength | 1.3.6.1.3.9999.1.2.1.35 | Unsigned32 | read-create | For use by LDP signaling |
| U32 mplsCemVcLdpGroupId | 1.3.6.1.3.9999.1.2.1.36 | Unsigned32 | read-create | For use by LDP signaling |
| U32 mplsCemVcLdpOptParam1 | 1.3.6.1.3.9999.1.2.1.37 | Unsigned32 | read-create | For use by LDP signaling |
| U32 mplsCemVcLdpOptParam2 | 1.3.6.1.3.9999.1.2.1.38 | Unsigned32 | read-create | For use by LDP signaling |
| T/F mplsCemVcTrapEnable | 1.3.6.1.3.9999.1.2.1.39 | TruthValue | read-write | If this object is true, generation of mplsCemVcUp and mplsCemVcDown traps aare enabled for this CEM VC, otherwise these traps are not emitted. |
| INT mplsCemVcAdminStatus | 1.3.6.1.3.9999.1.2.1.40 | INTEGER | read-create | The desired operational status of this CEM VC. |
| INT mplsCemVcOperStatus | 1.3.6.1.3.9999.1.2.1.41 | INTEGER | read-only | Indicates the actual operational status of this CEM VC. |
| ROW mplsCemVcRowStatus | 1.3.6.1.3.9999.1.2.1.42 | RowStatus | read-create | For creating, modifying, and deleting this row. |
| STO mplsCemVcStorageType | 1.3.6.1.3.9999.1.2.1.43 | StorageType | read-create | This variable indicates the storage type for this object. |
| mplsCemVcPerfTable | 1.3.6.1.3.9999.1.3 | not-accessible | This table provides per CEM VC performance information. Note: outbound errors are not being considered. It is assumed (at this time) that CEM packets will be forwarded as they are generated. i.e., it is assumed that there are no local outbound packet congestion issues. HC (high capacity) counters are needed for packet counts due to the high speeds expected with CEM. A SONET path of width 48 can rollover a non-HC counter in a few minutes. | |
| mplsCemVcPerfEntry | 1.3.6.1.3.9999.1.3.1 | not-accessible | An entry in this table is created by the agent for every mplsCemVcEntry. It is an extension to mplsCemVcEntry. | |
| C64 mplsCemVcPerfTotalInPacketsHC | 1.3.6.1.3.9999.1.3.1.1 | Counter64 | read-only | Number of inbound packets received. |
| C64 mplsCemVcPerfTotalOutPacketsHC | 1.3.6.1.3.9999.1.3.1.2 | Counter64 | read-only | Number of outbound packets sent. |
| C64 mplsCemVcPerfDbaInPacketsHC | 1.3.6.1.3.9999.1.3.1.3 | Counter64 | read-only | Number of DBA packets received. |
| C64 mplsCemVcPerfDbaOutPacketsHC | 1.3.6.1.3.9999.1.3.1.4 | Counter64 | read-only | Number of DBA packets sent. |
| C64 mplsCemVcPerfInNegPtrAdjustHC | 1.3.6.1.3.9999.1.3.1.5 | Counter64 | read-only | Number of negative pointer adjustments made on the SONET path based on CEM pointer adjustments received. |
| C64 mplsCemVcPerfInPosPtrAdjustHC | 1.3.6.1.3.9999.1.3.1.6 | Counter64 | read-only | Number of postive pointer adjustments made on the SONET path based on CEM pointer adjustments received. |
| C64 mplsCemVcPerfOutNegPtrAdjustHC | 1.3.6.1.3.9999.1.3.1.7 | Counter64 | read-only | Number of negative pointer adjustments seen on the SONET path and encoded onto sent CEM packets. |
| C64 mplsCemVcPerfOutPosPtrAdjustHC | 1.3.6.1.3.9999.1.3.1.8 | Counter64 | read-only | Number of positive pointer adjustments seen on the SONET path and encoded onto sent CEM packets. |
| C32 mplsCemVcPerfCrctHdrErrors | 1.3.6.1.3.9999.1.3.1.9 | Counter32 | read-only | Number of correctable CEM header errors detected on inbound CEM packets. |
| C32 mplsCemVcPerfUncrctHdrErrors | 1.3.6.1.3.9999.1.3.1.10 | Counter32 | read-only | Number of uncorrectable CEM header errors detected on inbound CEM packets. |
| C32 mplsCemVcPerfMissingPkts | 1.3.6.1.3.9999.1.3.1.11 | Counter32 | read-only | Number of missing packets (as detected via CEM header sequence number gaps). |
| C32 mplsCemVcPerfPktsOoseq | 1.3.6.1.3.9999.1.3.1.12 | Counter32 | read-only | Number of packets detected out of sequence (via CEM header sequence numbers), but were able to be re-sequenced. That is, the differential in sequence numbers was less than the jitter buffer depth. Note: some implementations may not support this feature (see mplsCemVcPktResequence). Any packets so far out of sequence that a re-sequencer can not correct for would be counted as missing packet. |
| C32 mplsCemVcPerfJtrBfrUnderruns | 1.3.6.1.3.9999.1.3.1.13 | Counter32 | read-only | Number of times the jitter buffer transitioned to empty. |
| C32 mplsCemVcPerfJtrBfrOverruns | 1.3.6.1.3.9999.1.3.1.14 | Counter32 | read-only | Number of packets received while jitter buffer is full. |
| TIM mplsCemVcPerfDiscontinuityTime | 1.3.6.1.3.9999.1.3.1.15 | TimeStamp | read-only | The value of sysUpTime on the most recent occasion at which any one or more of this segment's Counter32 or Counter64 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. |
| mplsCemMappingTable | 1.3.6.1.3.9999.1.4 | not-accessible | This table maps an inbound Tunnel/VcLabel to a CEM VC. | |
| mplsCemMappingEntry | 1.3.6.1.3.9999.1.4.1 | not-accessible | A row in this table represents the inbound connection between a Tunnel/VcLabel and CEM VC/instance. It is indexed by the same 4 indexes that index the inbound Tunnel, then adds the VC Label as a 5th index. The Tunnel referenced here is in the mplsTunnelTable. - The mplsCemMappingInTunnelIndex uniquely identifies a singular Tunnel or a group. If a group, individual Tunnels are identified by the Instance. - The mplsCemMappingInTunnelInstance. - ID (normally an IP address) for the ingress LSR, mplsCemMappingInTunnelIngressLSR. - ID (normally an IP address) of the Local (egress) LSR, mplsCemMappingInTunnelLocalLSR, - and the VC Label, mplsCemMappingVcLabel. | |
| MPL mplsCemMappingInTunnelIndex | 1.3.6.1.3.9999.1.4.1.1 | MplsTunnelIndex | accessible-for-notify | Primary index for the conceptual row identifying a group of Tunnel/VcLabel to CEM VC mappings. |
| MPL mplsCemMappingInTunnelInstance | 1.3.6.1.3.9999.1.4.1.2 | MplsTunnelInstanceIndex | accessible-for-notify | Uniquely identifies an instance of a mapping |
| MPL mplsCemMappingInTunnelIngressLSR | 1.3.6.1.3.9999.1.4.1.3 | MplsLsrId | accessible-for-notify | Uniquely identifies an ingress LSR |
| MPL mplsCemMappingInTunnelLocalLSR | 1.3.6.1.3.9999.1.4.1.4 | MplsLsrId | accessible-for-notify | Uniquely identifies the local LSR |
| MPL mplsCemMappingVcLabel | 1.3.6.1.3.9999.1.4.1.5 | MplsLabel | accessible-for-notify | Identifies a unique label on this tunnel |
| I32 mplsCemMappingVcIndex | 1.3.6.1.3.9999.1.4.1.6 | Integer32 | read-create | Index for entry (or group of entries, in the case of backup VCs) in the mplsCemVcTable. This value can also be thought of as the Circuit ID. |
| I32 mplsCemMappingVcInstance | 1.3.6.1.3.9999.1.4.1.7 | Integer32 | read-create | Identifies a unique member within a CEM VC group. (This could of course be a group of one.) |
| ROW mplsCemMappingRowStatus | 1.3.6.1.3.9999.1.4.1.8 | RowStatus | read-create | For creating, modifying, and deleting this row. |
| STO mplsCemMappingStorageType | 1.3.6.1.3.9999.1.4.1.9 | StorageType | read-create | This variable indicates the storage type for this object. |
| mplsCemTunnelExtTable | 1.3.6.1.3.9999.1.5 | not-accessible | This table is an extension to the mplsTunnelTable. This table exists to configure parameters useful for CEM APS. | |
| mplsCemTunnelExtEntry | 1.3.6.1.3.9999.1.5.1 | not-accessible | A row in this table represents a Tunnel used for CEM VCs. The Tunnel referenced here is in the mplsTunnelTable. It is indexed by the same 4 indexes of the inbound Tunnel: - The mplsCemTunnelExtIndex uniquely identifies a singular Tunnel or a group. If a group, individual Tunnels are identified by the Instance. - The mplsCemTunnelExtInstance. - ID (normally an IP address) for the ingress LSR, mplsCemTunnelExtIngressLSR. - ID (normally an IP address) of the Local (egress) LSR, mplsCemTunnelExtLocalLSR. In the mplsTunnelTable, this index would be referred to as the Egress LSR ID. Since CEM is always at a tunnel termination, the egress LSR is always the local (edge) LSR. The local agent creates an entry here for every entry created in the mplsCemMappingTable. | |
| T/F mplsCemTunnelExtApsEnable | 1.3.6.1.3.9999.1.5.1.1 | TruthValue | read-create | Enables this Tunnel (as part of a group) to be used for APS. Remember a Tunnel group is created when a unique Tunnel index (in mplsTunnelTable) has multiple instances. Tunnel disabling may be useful when a Tunnel is suspect, being debugged, or not fully configured. Note: some implementations may not support APS. |
| BIT mplsCemTunnelExtApsCriteria | 1.3.6.1.3.9999.1.5.1.6 | Bits | read-write | Bits set here represent defects and modes for switching all VCs within this Tunnel to another Tunnel that has no APS defects. Currently, only CEM defects are available. Separating and individually selecting CEM defects (buffer errors, header errors, etc.) is for future study. Also, for future study: determining a Tunnel's state of usefulness via other indications (such as OAM). If 'cemVcCriteria' is set, mplsCemTunnelExtApsViaCemVc is used to index the CEM VC for which defects are included. The purpose of this is in situations when CEM VCs can generate better defects than Tunnels (for example: buffer errors). Revertive and Hunt modes: 'revertive' is useful for non-primary Tunnels where you may want to switch back to a primary Tunnel that has no defects while the currently active also has no defects (see mplsCemTunnelExtApsRevertTimer). 'revertive' should NOT be used when standby Tunnels have no available defect indications. If 'revertive' is not set, then manual reversion is possible by simply setting the active Tunnel's admin status 'down', then 'up'. 'hunt' is useful when standby Tunnels offer no defect indications (see mplsCemTunnelExtApsHoldOffTimer). 'hunt' should not be used when standby Tunnels have available defect indications. Hunting assumes standby Tunnels are good, if not the down timers will determine it's bad, and hunting continues. 'hunt' and 'revertive' are mutually exclusive. Note: criteria defect bits here MUST align with mplsCemTunnelExtDefects so it can be used as a mask. |
| BIT mplsCemTunnelExtDefects | 1.3.6.1.3.9999.1.5.1.7 | Bits | read-only | Current state of Tunnel defect indications. Other bits here may be defined here to show results of error trend analysis. Note: These bits MUST be aligned with mplsCemTunnelExtApsCriteria bits so mplsCemTunnelExtApsCriteria can be used as a mask. Note: other defect indications (e.g. from OAM) are for future study. |
| U32 mplsCemTunnelExtApsHoldoffTimer | 1.3.6.1.3.9999.1.5.1.8 | Unsigned32 | read-create | Primarily used to hold-off an APS switch after the Tunnel has been determined 'down'. The purpose is to allow potential recovery schemes within lower communications layers a chance to recover. Also useful in 'hunt' mode to hold off switching to the next Tunnel (slows oscillation when all Tunnels are down). |
| U32 mplsCemTunnelExtApsRevertTimer | 1.3.6.1.3.9999.1.5.1.9 | Unsigned32 | read-create | If this Tunnel is active and 'up', then this timer is used in conjunction with 'revertive' (if set above). The reversion would be delayed for this time. |
| U32 mplsCemTunnelExtApsViaCemVcIndex | 1.3.6.1.3.9999.1.5.1.10 | Unsigned32 | read-write | Index of the CEM VC from which APS defect criteria are included with this Tunnel's APS criteria. |
| U32 mplsCemTunnelExtApsViaCemVcInstance | 1.3.6.1.3.9999.1.5.1.11 | Unsigned32 | read-write | Instance of the CEM VC from which APS defect criteria are included with this Tunnel's APS criteria. |
| STO mplsCemTunnelExtStorageType | 1.3.6.1.3.9999.1.5.1.12 | StorageType | read-write | This variable indicates the storage type for this object. |
| mplsCemTunnelExtPerfTable | 1.3.6.1.3.9999.1.6 | not-accessible | This table is an extension to the mplsTunnelTable. It provides per Tunnel performance information. | |
| mplsCemTunnelExtPerfEntry | 1.3.6.1.3.9999.1.6.1 | not-accessible | An entry in this table is created by the agent for every mplsCemTunnelExtEntry. It is an extension to mplsCemTunnelExtEntry. | |
| C32 mplsCemTunnelExtPerfFailedLabelLookups | 1.3.6.1.3.9999.1.6.1.1 | Counter32 | read-only | Number of packets with unexpected labels received. This count is based on inbound VC labels seen that are not configured for this Tunnel. |
| MPL mplsCemTunnelExtPerfLastFailedLookup | 1.3.6.1.3.9999.1.6.1.2 | MplsLabel | read-only | Contains label from the packet that last failed a label lookup on this Tunnel. |
| mplsCemSonetPathExtTable | 1.3.6.1.3.9999.1.7 | not-accessible | This table associates a SONET path with a CEM VC (or CEM VC group) and provides the starting time-slot of the SONET path. It as assumed that the transmit and receive sides of the SONET path have the same starting time-slots. It is also assumed that STSn paths have contiguous time-slots. | |
| mplsCemSonetPathExtEntry | 1.3.6.1.3.9999.1.7.1 | not-accessible | This table is indexed by the SONET path ifIndex. An entry to this table is created by the agent when an entry is created in the mplsCemVcTable. | |
| U32 mplsCemSonetPathExtVcIndex | 1.3.6.1.3.9999.1.7.1.1 | Unsigned32 | read-write | Index to entry in the mplsCemVcTable. |
| U32 mplsCemSonetPathExtTimeSlot | 1.3.6.1.3.9999.1.7.1.2 | Unsigned32 | read-write | Starting time-slot for this SONET path within the SONET line and section. For OC-48, this value could range from 1 to 48. The SONET path width must be taken into consideration here, for example, in an OC-48 an STS-3c could not start at time-slot 47. |
| STO mplsCemSonetPathExtStorageType | 1.3.6.1.3.9999.1.7.1.3 | StorageType | read-write | This variable indicates the storage type for this object. |
| T/F mplsCemTrapEnable | 1.3.6.1.3.9999.1.8 | TruthValue | read-write | If this object is true, then it enables the generation of mplsCemVcUp and mplsCemVcDown traps, otherwise these traps are not emitted. These traps are also individually enabled for each CEM VC. |
RFC description
Manages MPLS Circuit Emulation (CEM) services providing configuration and status for emulated TDM circuits over MPLS networks.
Start monitoring MPLS edge routers and circuit emulation gateways with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.