246 CHAPTER 7: USING MULTICAST PROTOCOL COMMANDS
mtracert Syntax
mtracert
{ source-address } [ last-hop-address ] [ group-address ]
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Parameter
source-address
: Address of the multicast source.
l
ast-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.
<SW5500>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
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