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Scenario
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.
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.
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.
524
Multicast Features
Output
103.103.103.0/24
-3
2.2.2.1
103.103.103.0/24
-4
103.103.103.3
--------------------------------------------------------------
----
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
Mask|
--------------------------------------------------------------
---
0
1.1.1.1
-1
1.1.1.1
tree
-2
12.12.12.1
tree
--------------------------------------------------------------
----
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
Mask|
--------------------------------------------------------------
---
0
4.4.4.5
-1
4.4.4.4
6.6.6.0/24
-2
20.20.20.2
-3
10.10.10.1
--------------------------------------------------------------
----
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
Mask|
--------------------------------------------------------------
---
0
4.4.4.5
-1
4.4.4.4
6.6.6.0/24
-2
20.20.20.2
PIM
-
-->
Source
|Proto| Forwarding Code |Source Network/
-->
Destination
PIM
-
PIM
Reached RP/Core
|Proto| Forwarding Code |Source Network/
-->
Destination
PIM
-
PIM
-
PIM
No route
|Proto| Forwarding Code |Source Network/
-->
Destination
PIM
-
PIM
-
shared
shared
6.6.6.0/24
default
6.6.6.0/24
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- Accessing the Command Line
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Troubleshooting
