White Papers

Table Of Contents
Table 72. Mtrace Scenarios (continued)
Scenario Output
You invoke a weak mtrace request
by specifying only the source without
specifying the mulicast tree or multicast
group information for the source. Mtrace
traces a path towards the source by
using the RPF neighbor at each node.
R1>mtrace 103.103.103.3
Type Ctrl-C to abort.
Querying reverse path for source 103.103.103.3 via RPF
From source (?) to this node
---------------------------------------------------------
--------
|Hop| OIF IP |Proto| Forwarding Code |Source
Network/Mask|
---------------------------------------------------------
--------
0 0.0.0.0* --> Destination
-1 0.0.0.0* PIM -
103.103.103.0/24
-2 2.2.2.1 PIM -
103.103.103.0/24
-3 103.103.103.3 --> Source
---------------------------------------------------------
---------
* - Any PIM enabled interface on this node
R1>mtrace 103.103.103.3 1.1.1.1
Type Ctrl-C to abort.
Querying reverse path for source 103.103.103.3 to
destination 1.1.1.1 via RPF
From source (?) to destination (?)
---------------------------------------------------------
--------
|Hop| OIF IP |Proto| Forwarding Code |Source
Network/Mask|
---------------------------------------------------------
--------
0 1.1.1.1 --> Destination
-1 1.1.1.1 PIM -
103.103.103.0/24
-2 101.101.101.102 PIM -
103.103.103.0/24
-3 2.2.2.1 PIM -
103.103.103.0/24
-4 103.103.103.3 --> Source
---------------------------------------------------------
---------
You can issue the mtrace command
by providing the source and multicast
information. However, if the multicast
group is a shared group (*,G), then
mtrace traces the path of the shared tree
until it reaches the RP. The source mask
field reflects the shared tree that is being
used to trace the path. The shared tree
is used even in case where the source
provided is not valid.
R1>mtrace 3.3.3.3 1.1.1.1 226.0.0.3
Type Ctrl-C to abort.
Querying reverse path for source 3.3.3.3 to destination
1.1.1.1 via group 226.0.0.3
From source (?) to destination (?)
---------------------------------------------------------
--------
|Hop| OIF IP |Proto| Forwarding Code |Source
Network/Mask|
---------------------------------------------------------
--------
0 1.1.1.1 --> Destination
-1 1.1.1.1 PIM - shared
tree
-2 12.12.12.1 PIM Reached RP/Core shared
tree
---------------------------------------------------------
---------
566 Multicast Features