Re: Multicast Routing Issue

Your outgoing interface is NULL, this is why the P flag shows up.

On Mon, Aug 3, 2009 at 4:28 AM, Federico Cossu <federico.cossu_at_gmail.com>wrote:

> the "oif-null" multicast troubleshooting is the one i hate,
> imho it's really difficult to debug this, i prefer to found myself in
> the "RPF-like" problems.
>
> /R
>
>
> 2009/8/3 Joe Astorino <jastorino_at_ipexpert.com>:
> > Try a "debug ip mpacket" on that device and see what you can find out.
> That
> > will help diagnose the problem.
> >
> > On Fri, Jul 31, 2009 at 11:53 AM, <quinton_at_flowtraders.com> wrote:
> >
> >> Morning All,
> >>
> >> I am trying to determine why a PIM-SM RP is pruning a m/cast group from
> the
> >> m/cast routing table. PIM neighbor relationships are established and
> there
> >> is
> >> no problem with RPF. I have the following output from "sh ip mroute
> >> 239.33.42.1
> >> count.
> >>
> >> pcoresw01#sh ip mroute 239.33.42.1 count
> >> IP Multicast Statistics
> >> 7 routes using 3826 bytes of memory
> >> 6 groups, 0.16 average sources per group
> >> Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per
> >> second
> >> Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
> >>
> >> Group: 239.33.42.1, Source count: 1, Packets forwarded: 0, Packets
> >> received:
> >> 70758
> >> RP-tree: Forwarding: 0/0/0/0, Other: 67595/0/67595
> >> Source: 10.33.42.134/32, Forwarding: 0/-1/0/0, Other: 3163/0/3163
> >>
> >> AND
> >>
> >> pcoresw01#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
> >> 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
> >>
> >> (*, 239.33.42.1), 1d06h/stopped, RP 10.254.254.9, flags: SP
> >> Incoming interface: Null, RPF nbr 0.0.0.0
> >> Outgoing interface list: Null
> >>
> >> (10.33.42.134, 239.33.42.1), 02:22:33/00:02:53, flags: PT
> >> Incoming interface: Vlan42, RPF nbr 0.0.0.0, RPF-MFD
> >> Outgoing interface list: Null
> >>
> >> My question is this: what does the Other: 3163/0/3163 represent. I
> >> understand
> >> that these are multicast packet which have been dropped but I need to
> find
> >> out
> >> why the drops occurred.
> >>
> >> Many thanks
> >>
> >> Quinton
> >>
> >>
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> >>
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> >>
> >>
> >>
> >>
> >
> >
> > --
> > Regards,
> >
> > Joe Astorino - CCIE #24347 R&S
> > Technical Instructor - IPexpert, Inc.
> > Cell: +1.586.212.6107
> > Fax: +1.810.454.0130
> > Mailto: jastorino_at_ipexpert.com
> >
> >
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>
> --
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net