3Com 3031 Command Reference Manual page 692

692 C 7: M
HAPTER ULTICAST
C C C
OMMON ONFIGURATION OMMANDS
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.
<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
Trace reversely the path information of multicast group 225.1.1.1 from the
multicast source 10.10.1.3 to the destination address 12.110.0.2.
<3Com>mtracert 10.10.1.3 12.110.0.2 225.1.1.1
Type Ctrl+C to abort
Mtrace from 10.10.1.3 to 12.110.0.2 via group 225.1.1.1
Querying full reverse path...