From: Hobbs (deadheadblues@gmail.com)
Date: Tue Oct 21 2008 - 15:44:40 ARST
I believe you see the P anytime the OIL is null. I think I read this in the
Developing IP Multicast Networks book.
On Mon, Oct 20, 2008 at 9:40 AM, Morris, Jason L. <
Jasmorris@axcess-financial.com> wrote:
> 'S' just means its running sparse mode.
>
> 'J' means your using the STP (your hearing directly from the source not
> through the RP)
>
> 'P' means your not forwarding the information to anyone (which kind of
> confuses me but I'll get to that in a minute.)
>
> 'L' means your router is a member of that group and is processing
> information for the group.
>
> I am a little confused by the appearance of the P and the L flags
> together. I don't have time to lab it up this morning but, is that
> normal operation?
>
> Isn't the P flag going to send a prune message upstream which will cause
> the router to stop receiving the multicast for that group. Shouldn't
> what ever interface that's making it 'local' show up in the outgoing
> interface list?
>
> Jason Morris
>
>
>
>
>
>
> Protect 6000+ jobs and preserve financial freedom in Ohio!
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> yungli2008@gmail.com
> Sent: Monday, October 20, 2008 10:50 AM
> To: ccielab@groupstudy.com
> Subject: Flags in Multicast
>
> Hi experts
> Would you please anyone guide me to clarify the flags field in
> multicast?
>
> my doubt is what is exactly the "flags" field saying?
>
> here a simple example
> Router# show 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
>
> (*, 224.0.1.40), 00:07:04/00:02:49, RP 2.2.2.2, flags: SJPL
> Incoming interface: FastEthernet0/0, RPF nbr 10.0.12.2
> Outgoing interface list: Null
>
> the flags field is "flags:SJPL"
> S- Sparse
> J- Join SPT
> P- Pruned
> L- Local
>
> What can I understand from this field?
> Can anyone give some wonderful explanation for this?
>
> regards
> Li
>
>
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