From: Gary Duncanson (gary.duncanson@googlemail.com)
Date: Tue Apr 15 2008 - 11:34:19 ART
In the lab you wont have much time for this type of thing but as an exercise
I think it's worthwhile.
I find books somewhat lacking when it comes to this sort of thing.
Have your tried configuring a working configuration from a book, baselining
the output before breaking things and seeing what you get when you do shows?
HTH
Gary
----- Original Message -----
From: "Matt Bentley" <mattdbentley@gmail.com>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Tuesday, April 15, 2008 3:17 PM
Subject: Multicast Routing Table Woes
> Hi GS:
>
> I understand the theory behind multicast and WHY things don't work, but it
> seems like the KEY to be ablle to fix a MCAST problem is to be able to
> look
> at the "debug ip mpacket" output, the MCAST routing table, understand
> what's
> going on, and then take appropriate action. Could someone help me to
> understand exactly how to decode the mcast routing table? I know that the
> entry with 224.0.1.39 is the RP and the 224.0.1.40 is the Mapping agent,
> but
> am having difficulty finding parallels any further than that. Any help
> would be greatly appreciated. I have included the Mcsat Table from one of
> my switches. Thanks very much in advance.
>
>
> THREE#sh ip mroute
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C -
> Connected,
> L - Local, P - Pruned, R - RP-bit set, F - Register flag,
> T - SPT-bit set, J - Join SPT, M - MSDP created entry,
> X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
> U - URD, I - Received Source Specific Host Report,
> Z - Multicast Tunnel, z - MDT-data group sender,
> Y - Joined MDT-data group, y - Sending to MDT-data group
> Outgoing interface flags: H - Hardware switched, A - Assert winner
> Timers: Uptime/Expires
> Interface state: Interface, Next-Hop or VCD, State/Mode
>
> (*, 225.0.0.1), 00:22:48/stopped, RP 15.15.15.15, flags: SJCLF
> Incoming interface: FastEthernet0/3, RPF nbr 3.3.3.1
> Outgoing interface list:
> FastEthernet0/2, Forward/Sparse, 00:19:41/00:03:16, H
>
> (2.2.2.2, 225.0.0.1), 00:00:06/00:02:53, flags: LFT
> Incoming interface: FastEthernet0/1, RPF nbr 0.0.0.0, Registering
> Outgoing interface list:
> FastEthernet0/2, Forward/Sparse, 00:00:06/00:02:53, H
>
> (3.3.3.2, 225.0.0.1), 00:00:07/00:02:52, flags: LFT
> Incoming interface: FastEthernet0/3, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/2, Forward/Sparse, 00:00:07/00:02:52, H
>
> (8.8.8.1, 225.0.0.1), 00:00:07/00:03:22, flags: PLT
> Incoming interface: FastEthernet0/2, RPF nbr 0.0.0.0
> Outgoing interface list: Null
>
> (13.13.13.13, 225.0.0.1), 00:00:08/00:03:21, flags: LFT
> Incoming interface: Loopback0, RPF nbr 0.0.0.0, Registering
> Outgoing interface list:
> FastEthernet0/2, Forward/Sparse, 00:00:08/00:02:51
>
> (*, 224.0.1.39), 2w2d/stopped, RP 0.0.0.0, flags: DC
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 2w2d/00:02:19
>
> (15.15.15.15, 224.0.1.39), 2w2d/00:02:51, flags: T
> Incoming interface: FastEthernet0/3, RPF nbr 3.3.3.1
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 2w2d/00:02:19
>
> (*, 224.0.1.40), 2w2d/stopped, RP 0.0.0.0, flags: DCL
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/1, Forward/Sparse, 2w2d/00:02:14
>
> (12.12.12.12, 224.0.1.40), 2w2d/00:02:31, flags: PLTX
> Incoming interface: FastEthernet0/1, RPF nbr 2.2.2.1
> Outgoing interface list: Null
>
>
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