Sending Linktrace Messages And Responses; Caching Link Trace - Dell S4820T Configuration Manual

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Sending Linktrace Messages and Responses

Linktrace message and response (LTM, LTR), also called Layer 2 Traceroute, is an administratively sent

multicast frames transmitted by MEPs to track, hop-by-hop, the path to another MEP or MIP within the

maintenance domain.

All MEPs and MIPs in the same domain respond to an LTM with a unicast LTR. Intermediate MIPs forward

the LTM toward the target MEP.

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

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