Re: Multicast Routing Issue

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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>>
>
>
> --
> 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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