[c-nsp] PIM and network redundancy

[Jean-Francois.Dube at videotron.com]

Hi Rob,

Did you mean to say you have IGMP static-groups on the 7600_3 to attract
multicast traffic toward your distribution switches?

If you meant 7600_1 then I'm not sure what your topology is but the
redundancy issue made me think of a similar issue I faced in the past.


Are you using any static routes (or mroutes) on 7600_3 to the multicast
source?

I think your multicast trafic must have failed RPF check when the link
between 7600_1 and 7600_2 failed.

Using "show ip mroute count" you can maybe check your "Other counts"
counters to confirm this. The RPF failed counter should be high.


WS-C6506#show ip mroute 232.32.1.1 10.154.128.58 count
IP Multicast Statistics
785 routes using 396312 bytes of memory
362 groups, 1.16 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: 232.32.1.1, Source count: 1, Packets forwarded: 630315119, Packets
received: 630659870
  Source: 10.154.128.58/32, Forwarding: 630315119/393/1344/4230, Other:
630659870/0/344751


PIM is protocol independent and depends on CEF/RIB so if OSPF converges
then PIM should converge as well.

Hope this helps.

Cheers,

JF

Jean-François Dubé
Technicien, Opérations Réseau IP
Ingénierie Exploitation des Réseaux
Vidéotron

"cisco-nsp" <cisco-nsp-bounces at puck.nether.net> a écrit sur 2014-02-03
17:39:44 :

> De : Robert Hass <robhass at gmail.com>
> A : "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>,
> Date : 2014-02-03 17:47
> Objet : [c-nsp] PIM and network redundancy
> Envoyé par : "cisco-nsp" <cisco-nsp-bounces at puck.nether.net>
>
> Hi
> I have project where network looks like this:
>
> IPTV source
> |
> 7600_1------------
> |                      |
> |                      |
> 7600_2            |
> |                      |
> |                      |
> 7600_3-------------
> |
> IPTV distribution switches (~20 VLANs)
>
> I'm currently using PIM static joins on first 7600 next to the source and
> classic PIM spare-mode (ip pim spare-mode) sessions between rest 7600 and
> 'pim passive' from 7600 to IPTV distribution switches. First 7600 is my
RP.
>
> My question is how I can provide redundancy in this network. I had issue,
> when link between 7600_1 and 7600_2 was down, and traffic switched to
link
> 7600_1--7600_3. IPv4 works without problem as OSPF use backup path.
>
> But how deal with PIM and multicasts ? Intergrate MSDP or other
protocol ?
> Any recommendations ? I think about creating xconnect (L2VPN over MPLS)
> from first 7600_1 to 7600_3 and put additional Cat6500 on the end as PIM
> box.
>
> Rob
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