Caching Link Trace - Dell S4820T Configuration Manual

Figure 5. MPLS Core
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.
• Send a Linktrace message. Because the LTM is a Multicast message sent to the entire ME, there is no
need to specify a destination.
EXEC Privilege
traceroute ethernet domain

Caching Link Trace

After you execute a Link Trace command, the trace information can be cached so that you can view it
later without retracing.
To enable, set, display, and delete link trace caching, use the following commands.
• Enable Link Trace caching.
CONFIGURATION mode
traceroute cache
• Set the amount of time a trace result is cached.
ETHERNET CFM mode
traceroute cache hold-time minutes
The default is 100 minutes.
The range is from 10 to 65535 minutes.
802.1ag
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