User's Manual

User’s Manual of SGS-5240 Series Managed Switch
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from each MIP along the path and from the target MEP. Information stored in the cache includes the maintenance domain
name, MA name, MEPID, sequence number, and TTL value.
 Link Trace Cache Hold Time – The hold time for CFM link trace cache entries. (Range: 1-65535 minutes; Default: 100
minutes)
Before setting the aging time for cache entries, the cache must first be enabled in the Linktrace Cache attribute field.
 Link Trace Cache Size – The maximum size for the link trace cache. (Range: 1-4095 entries; Default: 100 entries)
If the cache reaches the maximum number of specified entries, or the size is set to a value less than the current number
of stored entries, no new entries are added. To add additional entries, the cache size must first be increased, or purged.
Continuity Check Errors
 Connectivity Check Config – Sends a trap if this device receives a continuity check message (CCM) with the same
maintenance end point identifier (MPID) as its own but with a different source MAC address, indicating that a CFM
configuration error exists.
 Connectivity Check Loop – Sends a trap if this device receives a CCM with the same source MAC address and MPID
as its own, indicating that a forwarding loop exists.
 Connectivity Check MEP Down – Sends a trap if this device loses connectivity with a remote maintenance end point
(MEP), or connectivity has been restored to a remote MEP which has recovered from an error condition.
 Connectivity Check MEP Up – Sends a trap if a remote MEP is discovered and added to the local database, the port
state of a previously discovered remote MEP changes, or a CCM is received from a remote MEP which as an expired
entry in the archived database. MEP Up traps are suppressed when cross-checking of MEPs is enabled11 because
cross-check traps include more detailed status information. Cross-check Errors
 Cross Check MA Up – Sends a trap when all remote MEPs in an MA come up. An MA Up trap is sent if cross-checking is
enabled, and a CCM is received from all remote MEPs configured in the static list for this maintenance association
 Cross Check MEP Missing – Sends a trap if the cross-check timer expires and no CCMs have been received from a
remote MEP configured in the static list. A MEP Missing trap is sent if cross-checking is enabled
11, and no CCM is
received for a remote MEP configured in the static list
12.
 Cross Check MEP Unknown – Sends a trap if an unconfigured MEP comes up. A MEP Unknown trap is sent if
cross-checking is enabled11, and a CCM is received from a remote MEP that is not configured in the static list12.