Edge-Core ECS4810-12M Layer 2, Management Manual

Page: 453 / 1236

C
HAPTER
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| Basic Administration Protocols
Connectivity Fault Management
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Domains" ), Configure MA page (see "Configuring CFM Maintenance
Associations" ), and the Configure MEP page (see "Configuring
Maintenance End Points" ).
When CFM is enabled, hardware resources are allocated for CFM
processing.
◆
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: Disabled)
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" ).