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802.1ag | 89
Figure 5-4. Linktrace Message and Response
Link trace messages carry a unicast target address (the MAC address of an MIP or MEP) inside a multicast
frame. The destination group address is based on the MD level of the transmitting MEP
(01:80:C2:00:00:3[8 to F]). The MPs on the path to the target MAC address reply to the LTM with an LTR,
and relays the LTM towards the target MAC until the target MAC is reached or TTL equals 0.
Link Trace Cache
After a Link Trace command is executed, the trace information can be cached so that you can view it later
without retracing.
Task Command Syntax Command Mode
Send a Linktrace message. Since the
LTM is a Multicast message sent to the
entire ME, there is no need to specify a
destination.
traceroute ethernet domain
EXEC Privilege
Task Command Syntax Command Mode
Enable Link Trace caching.
traceroute cache
CONFIGURATION
Set the amount of time a trace result is cached. traceroute cache hold-time minutes
Default: 100 minutes
Range: 10-65535 minutes
ETHERNET CFM
Set the size of the Link Trace Cache. traceroute cache size entries
Default: 100
Range: 1 - 4095 entries
ETHERNET CFM
Display the Link Trace Cache.
show ethernet cfm traceroute-cache
EXEC Privilege
MPLS Core
MEP
MIP MIP
MIP
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