From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu Aug 23 2007 - 10:12:22 ART
Another workaround for this is to force the auto-rp groups to be
sparse by configuring a default RP. For example in this particular design
you could set R1 to be the RP for both of these groups by doing the
following on all devices running PIM:
access-list 1 permit 224.0.1.39
access-list 1 permit 224.0.1.40
!
ip pim rp-address 192.1.1.1 1
If you then look at the "show ip mroute" output on R1 you should see
that 224.0.1.39 and 224.0.1.40 are running in sparse-mode, which will allow
them to be affected by NBMA mode, which effectively allows the incoming
interface to be the same as the outgoing interface in the multicast routing
table.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Sadiq Yakasai
> Sent: Thursday, August 23, 2007 4:21 AM
> To: NET HE
> Cc: tohsoon28@gmail.com; ccielab@groupstudy.com
> Subject: Re: Auto-RP Issues with NBMA Mode
>
> Hi Toh,
>
> Net He is right there. The C-RP and MA (.39 & .40) traffic will always
> remain a dense mode traffic and as such, this traffic will not be sent
> back out the FR interface in the Hub router when it is received,
> AFAIK, even when you enable NBMA mode on the Hub. Enabling NBMA mode
> on the Hub only caters for the split horizon issue for the sparse mode
> traffic coming in that FR interface.
>
> Workaround to this, I would configure a tunnel between every spoke
> router and the router that is bringing this dense mode traffic into
> the FR cloud.
>
> I have done this in the past, and it was the only solution I could use
> at the time.
>
> HTH
>
> Sadiq
>
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