C
HAPTER
14
| Basic Administration Protocols
Connectivity Fault Management
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CLI REFERENCES
â—† "CFM Commands" on page 1319
PARAMETERS
These parameters are displayed:
Global Configuration
◆ CFM Status – Enables CFM processing globally on the switch.
(Default: Enabled)
To avoid generating an excessive number of traps, the complete CFM
maintenance structure and process parameters should be configured
prior to enabling CFM processing globally on the switch. Specifically, the
maintenance domains, maintenance associations, and maintenance
end-points (MEPs) should be configured on each participating bridge
using the Configure MD page (see "Configuring CFM Maintenance
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: 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").
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