From: kasturi cisco (kasturi_cisco@hotmail.com)
Date: Sat Feb 28 2004 - 20:16:12 GMT-3
Michael,
If u have Jeff Doyle Vol2 good explanation is provided on how to use them
in Mcast troubleshooting. I will try to explain in short, but better to
access the Doc CD or book for more info.
As the names suggest mtrace is Multicast trace and helps to trace the
Mcast path. I think it uses UDP packet. Mtrace is used to trace the RPF
path between the source and destination. It can be used on any router and
not necessarily on any router in the RPF path.
R7#mtrace 136.10.1.1
Type escape sequence to abort.
Mtrace from 136.10.1.1 to 136.10.56.7 via RPF
From source (?) to destination (?)
Querying full reverse path...
0 136.10.56.7
-1 136.10.56.7 PIM [136.10.1.0/24]
-2 136.10.56.6 PIM [136.10.1.0/24]
-3 136.10.100.2 PIM [136.10.1.0/24]
-4 136.10.12.1 PIM [136.10.1.0/24]
-5 136.10.1.1
Mstat is similar to Mtrace and provides statistics of the path in addition to path info.
R7#mstat 136.10.7.7 136.10.1.1
Type escape sequence to abort.
Mtrace from 136.10.7.7 to 136.10.1.1 via RPF
From source (?) to destination (?)
Waiting to accumulate statistics......
Results after 10 seconds:
Mrinfo is used to provide Mcast information about a router.
It can be issued on any router to get information about any other
router.
R7#R7#mrinfo
136.10.56.7 [version 12.2] [flags: PMA]:
136.10.56.7 -> 136.10.56.6 [1/0/pim]
136.10.56.7 -> 136.10.56.5 [1/0/pim]
136.10.7.7 -> 0.0.0.0 [1/0/pim/querier/leaf]
R7#mrinfo
136.10.56.7 [version 12.2] [flags: PMA]:
<<< Source address for Query ,IOS version and
Flags = P is Prune capable, M= Mtrace capable, A=Auto RP capable]
The next 3 lines how what interfaces are multicast enabled and
any peers the router may have on these interface.
136.10.56.7 -> 136.10.56.6 [1/0/pim]
<< The interface with 56.7 address and its neighour, 56.7 and 56.6
[metric/ttl threshold/pim enabled]
136.10.56.7 -> 136.10.56.5 [1/0/pim]
<<< The interface with 56.7 address and its neighour, 56.7 and 56.5
[1 metric/ttl threshold/pim enabled]
136.10.7.7 -> 0.0.0.0 [1/0/pim/querier/leaf]
<<< The interface with 7.7 address and its neighbor, 7.7 has
no neighbor [metric/ttl threshold/pim enabled/ this interface is
the IGMP querier on this subnet/there is no transit router
attached and it is the leaf subnet]
Hope that helps.Correct me if needed.
Good Luck,
Kasturi.
------------------------------------------------------------------------
Masterpieces made affordable! Buy art prints. MSN Shopping.
This archive was generated by hypermail 2.1.4 : Fri Mar 05 2004 - 07:13:59 GMT-3