Web Management Guide

Chapter 12 | Basic Administration Protocols
Connectivity Fault Management
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◆ MEP Cross Check Start Delay – Sets the maximum delay that a device waits for
remote MEPs to come up before starting the cross-check operation. (Range: 1-
65535 seconds; Default: 10 seconds)
This parameter sets the time to wait for a remote MEP to come up, and the
switch starts cross-checking the list of statically configured remote MEPs in the
local maintenance domain (Configure Remote MEP page, see "Configuring
Remote Maintenance End Points") against the MEPs learned through continuity
check messages (CCMs).
The cross-check start delay should be configured to a value greater than or
equal to the continuity check message interval to avoid generating
unnecessary traps (see "Configuring CFM Maintenance Associations").
LInk Trace Cache Settings
◆ Link Trace Cache – Enables caching of CFM data learned through link trace
messages. (Default: Enabled)
A linktrace message is a multicast CFM frame initiated by a MEP, and forwarded
from MIP to MIP, with each MIP generating a linktrace reply, up to the point at
which the linktrace message reaches its destination or can no longer be
forwarded.
Use this command attribute to enable the link trace cache to store the results of
link trace operations initiated on this device. Use the CFM Transmit Link Trace
page (see "Transmitting Link Trace Messages") to transmit a linktrace message.
Linktrace responses are returned 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 (see "Displaying
Fault Notification Settings").
◆ 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 (see "Displaying Fault Notification Settings").
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.