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Black Box LR11xx Series Router Configurations Guide
118
Maximum hops is set to 32 and TTL is set to 127 in all mtrace packets as default.
For mtrace to work:
IGMP must be enabled in the router
IGMP should be enabled on at least one interface.
21.1.2 mtrace Example
Traceroute using mtrace from 192.168.0.0 to 192.168.2.22 through group 225.254.254.254
Blackbox> mtrace 192.168.0.0 192.168.2.22 239.254.254.254
mtrace from 192.168.2.0 to 192.168.2.22 through group 225.254.254.254
Querying full reverse path...
1 192.168.2.15 PIM thresh^ 0 0 ms
2 192.168.2.7 PIM thresh^ 0 2 ms
3 192.168.2.5 PIM thresh^ 0 674 ms
4 192.168.2.3 PIM thresh^ 0 673 ms
5 192.168.2.2 PIM thresh^ 0 674 ms
6 192.168.2.1 PIM thresh^ 0 673 ms
Where in the line 4 192.168.2.3 PIM thresh^ 0 673 ms:
192.168.2.3 is the intermediate router 4 hops away from the destination.
Multicast Protocol in use on this hop and TTL Threshold.
673 ms is the time taken to trace to be forwarded between hops.