Users Guide

Table 68. Mtrace Scenarios (continued)
Scenario Output
-2 12.12.12.1 PIM Reached RP/Core shared
tree
---------------------------------------------------------
---------
When you issue the mtrace command
with the source and multicast group
information, if a multicast route is not
present on a particular node, then the NO
ROUTE error code is displayed on the
node. In this scenario, the Source
Network/Mask column for that particular
node displays the the value as default.
R1>mtrace 6.6.6.6 4.4.4.5 234.1.1.1
Type Ctrl-C to abort.
Querying reverse path for source 6.6.6.6 to destination
4.4.4.5 via group 234.1.1.1
From source (?) to destination (?)
---------------------------------------------------------
--------
|Hop| OIF IP |Proto| Forwarding Code |Source
Network/Mask|
---------------------------------------------------------
--------
0 4.4.4.5 --> Destination
-1 4.4.4.4 PIM -
6.6.6.0/24
-2 20.20.20.2 PIM - 6.6.6.0/24
-3 10.10.10.1 PIM No route
default
---------------------------------------------------------
---------
If you invoke a weak mtrace query
(without the multicast group details) and
the RPF neighbor on one of the nodes to
the source is not PIM enabled, the output
of the command displays a NO ROUTE
error code in the Forwarding Code
column. In the command output, the
entry for that node in the Source
Network/Mask column displays the value
as default.
R1>mtrace 6.6.6.6 4.4.4.5
Type Ctrl-C to abort.
Querying reverse path for source 6.6.6.6 to destination
4.4.4.5 via group 234.1.1.1
From source (?) to destination (?)
---------------------------------------------------------
--------
|Hop| OIF IP |Proto| Forwarding Code |Source
Network/Mask|
---------------------------------------------------------
--------
0 4.4.4.5 --> Destination
-1 4.4.4.4 PIM -
6.6.6.0/24
-2 20.20.20.2 PIM - 6.6.6.0/24
-3 10.10.10.1 PIM No route
default
---------------------------------------------------------
---------
If a multicast tree is not formed due to a
configuration issue (for example, PIM is
not enabled on one of the interfaces on
the path), you can invoke a weak mtrace
to identify the location in the network
where the error has originated.
R1>mtrace 6.6.6.6 4.4.4.5
Type Ctrl-C to abort.
Querying reverse path for source 6.6.6.6 to destination
4.4.4.5 via RPF
From source (?) to destination (?)
---------------------------------------------------------
--------
|Hop| OIF IP |Proto| Forwarding Code |Source
Network/Mask|
---------------------------------------------------------
--------
0 4.4.4.5 --> Destination
-1 4.4.4.4 PIM
Multicast Features 607