3Com 5500G-EI Command Reference Guide - Page 246

246 CHAPTER 7: USING MULTICAST PROTOCOL COMMANDS mtracert Syntax mtracert { source-address } [ last-hop-address ] [ group-address ] View Any view Parameter source-address: Address of the multicast source. last-hop-address: Unicast address, which is the starting address of path tracing. This address must be an interface address of a hop router. By default, it is a physical interface address of the local router. group-address: Address of multicast group. By default, the value is 0.0.0.0. Description Using the mtracert command, you can 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. 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