From: Morris, Jason L. (Jasmorris@axcess-financial.com)
Date: Tue Oct 21 2008 - 16:15:41 ARST
My confusion came more from seeing the 'L' flag with the OIL as null.
I'm not sure why it's considering it local with no outgoing interfaces.
Jason Morris
Protect 6000+ jobs and preserve financial freedom in Ohio!
VOTE No on Issue 5 in Ohio
_____
From: Hobbs [mailto:deadheadblues@gmail.com]
Sent: Tuesday, October 21, 2008 1:45 PM
To: Morris, Jason L.
Cc: yungli2008@gmail.com; ccielab@groupstudy.com
Subject: Re: Flags in Multicast
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!
VOTE No on Issue 5 in Ohio
-----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
Blogs and organic groups at http://www.ccie.net
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