Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 1 Multicast Common Configuration
Commands
3Com Corporation
1-7
Description
Use the mtracert command to trace the network path from the multicast source to the
destination receiver along Multicast Distribution Tree, according to either the multicast
kernel routing table or RPF rule to the source. This command can help to locate the
faults, such as information loss and configuration error.
The trace mode to the group address of 0.0.0.0 is called weak trace mode.
Example
# Trace the path reversely from the local hop router 18.110.0.1 to the multicast source
10.10.1.2 in weak trace mode.
<3Com> mtracert 10.10.1.2
Type Ctrl+C to abort
Mtrace from 10.10.1.2 to 18.110.0.1 via RPF
Querying full reverse path...
-1 18.110.0.1
Incoming Interface Address: 18.110.0.1
Previous-Hop Router Address: 18.110.0.2
Input packet count on incoming interface: 0
Output packet count on outgoing interface: 0
Total number of packets for this source-group pair: 0
Protocol: PIM
Forwarding TTL: 0
Forwarding Code: No error
-2 18.110.0.2
Incoming Interface Address: 11.110.0.2
Previous-Hop Router Address: 11.110.0.4
Input packet count on incoming interface: 0
Output packet count on outgoing interface: 0
Total number of packets for this source-group pair: 0
Protocol: PIM
Forwarding TTL: 0
Forwarding Code: No error
-3 11.110.0.4
Incoming Interface Address: 10.10.1.3
Previous-Hop Router Address: 0.0.0.0
Input packet count on incoming interface: 0
Output packet count on outgoing interface: 0
Total number of packets for this source-group pair: 0
Protocol: PIM
Forwarding TTL: 0
Forwarding Code: No error