Clear ethernet cfm linktrace-cache, Show ethernet cfm linktrace-cache, Clear ethernet – Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) User Manual
Page 604: Cfm linktrace-cache
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Brocade 6910 Ethernet Access Switch Configuration Guide
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25
CFM Commands
number – The time to live of the linktrace message. (Range: 1-255 hops)
Default Setting
None
Command Mode
Privileged Exec
Command Usage
•
Link trace messages can be targeted to MEPs, not MIPs. Before sending a link trace message,
be sure you have configured the target MEP for the specified MA.
•
If the MAC address of target MEP has not been learned by any local MEP, then the linktrace
may fail. Use the
show ethernet cfm maintenance-points remote crosscheck
command to verify
that a MAC address has been learned for the target MEP.
•
Link trace messages (LTMs) are sent as multicast CFM frames, and forwarded from MIP to MIP,
with each MIP generating a link trace reply, up to the point at which the LTM reaches its
destination or can no longer be forwarded.
•
Link trace messages are used to isolate faults. However, this task can be difficult in an
Ethernet environment, since each node is connected through multipoint links. Fault isolation is
even more challenging since the MAC address of the target node can age out in several
minutes. This can cause the traced path to vary over time, or connectivity lost if faults cause
the target MEP to be isolated from other MEPs in an MA.
•
When using the command line or web interface, the source MEP used by to send a link trace
message is chosen by the CFM protocol. However, when using SNMP, the source MEP can be
specified by the user.
Example
This example sends a link trace message to the specified MEP with a maximum hop count of 25.
Console#linktrace ethernet dest-mep 2 md voip ma rd ttl 25
Console#
clear ethernet cfm linktrace-cache
This command clears link trace messages logged on this device.
Command Mode
Privileged Exec
Example
Console#clear ethernet cfm linktrace-cache
Console#
show ethernet cfm linktrace-cache
This command displays the contents of the link trace cache.
Command Mode
Privileged Exec