Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 1074)

1018 Brocade 6910 Ethernet Access Switch Configuration Guide
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Connectivity Fault Management
3. Select Configure Dual-Ended LM from the Action list.
4. Select the index for the MD, MA and MEP, and then click Query.
5. Mark the Status box to enable periodic transmission of loss-measure messages.
6. Specify the target MEP identifier.
7. Click Apply.
FIGURE 311 Transmitting Dual-Ended Loss-Measure Messages
Transmitting Link Trace Messages
Use the Administration > CFM (Transmit Link Trace) page to transmit link trace messages (LTMs).
These messages can isolate connectivity faults by tracing the path through a network to the
designated target node (i.e., a remote maintenance end point).
CLI References
• “CFM Commands” on page 517
Command Usage
• LTMs 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 (see
“Configuring Remote Maintenance
End Points” on page 1008).
• If the MAC address of a target MEP has not been learned by any local MEP, then the linktrace
may fail. Use the Show Remote MEP page (see
"Displaying Remote MEPs" ) to verify that a MAC
address has been learned for the target MEP.
• 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.
• LTMs 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.