Sending Linktrace Messages And Responses - Dell S4048T Configuration Manual

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 6. 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. There is no need to specify a destination, as the LTM is a Multicast message
sent to the entire ME.
EXEC Privilege
traceroute ethernet domain
802.1ag 109