Cross-Check Function - Cisco ASR 920 Series Configuration Manual Ethernet Router

Cross-Check Function

Cross-Check Function
The cross-check function is a timer-driven postprovisioning service verification between dynamically discovered
MEPs (via continuity check messages CCMs)) and expected MEPs (via configuration) for a service. The
cross-check function verifies that all endpoints of a multipoint or point-to-point service are operational. The
function supports notifications when the service is operational; otherwise it provides alarms and notifications
for unexpected or missing endpoints.
The cross-check function is performed one time. You must initiate the cross-check function from the CLI
every time you want a service verification.
SNMP Traps
The support provided by the Cisco IOS XE software implementation of Ethernet CFM traps is Cisco proprietary
information. MEPs generate two types of Simple Network Management Protocol (SNMP) traps, continuity
check (CC) traps and cross-check traps.
CC Traps
• MEP up--Sent when a new MEP is discovered, the status of a remote port changes, or connectivity from
• MEP down--Sent when a timeout or last gasp event occurs.
• Cross-connect--Sent when a service ID does not match the VLAN.
• Loop--Sent when a MEP receives its own CCMs.
• Configuration error--Sent when a MEP receives a continuity check with an overlapping MPID.
Cross-Check Traps
• Service up--Sent when all expected remote MEPs are up in time.
• MEP missing--Sent when an expected MEP is down.
• Unknown MEP--Sent when a CCM is received from an unexpected MEP.
How to Configure Ethernet CFM
Designing CFM Domains
Note To have an operator, service provider, or customer domain is optional. A network may have a single
domain or multiple domains. The steps listed here show the sequence when all three types of domains
will be assigned.
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
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a previously discovered MEP is restored after interruption.
Configuring Ethernet CFM