From: Gregory Gombas (ggombas@gmail.com)
Date: Mon Jul 16 2007 - 11:11:54 ART
Actually I think Antonio is right on the money because I had another
candidate RP advertising the 239.0.0.0/8 but you still only saw a
(-)239.0.0.0 mapping for the other RP when doing a show ip pim rp
mapping.
So effectively the one router that was denying the 239.0.0.0 was
overriding the other routers advertisement.
On 7/15/07, Antonio Soares <amsoares@netcabo.pt> wrote:
> Note: A 'deny' in the 'group-list' access-list has a different meaning
> beginning with IOS release 12.0(1.1).
>
> . Before 12.0.(1.1): Deny means "I'm not the RP for this group range."
>
> . After 12.0.(1.1): Deny means "Force this group range to always work in
> Dense mode.
>
> Note: Only a single C-RP needs to "deny" this group range to force this to
> happen. In other words, the 'deny' overrides any other router's "permit"
> advertisement.
>
>
> Source:
>
> ftp://ftp-eng.cisco.com/ipmulticast/training/Module6.pdf
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Gregory Gombas
> Sent: segunda-feira, 16 de Julho de 2007 1:19
> To: Group study
> Subject: Auto RP filtering
>
> I want my RP to announce the following groups using the least amount of
> lines:
> 226.0.0.0 - 238.255.255.255.
>
> Here is what my ACL looks like:
>
> access-list 1 deny 224.0.0.0 1.255.255.255
> access-list 1 deny 239.0.0.0 0.255.255.255
> access-list 1 permit 224.0.0.0 15.255.255.255
>
> ip pim send-rp-announce Loopback0 scope 16 group-list 1
>
> But when it advertises the groups I see following debug:
>
> *Mar 21 04:20:27.331: Auto-RP(0): Build announce entry for (-)(224.0.0.0/7)
> *Mar 21 04:20:27.331: Auto-RP(0): Build announce entry for (-)(239.0.0.0/8)
> *Mar 21 04:20:27.331: Auto-RP(0): Build announce entry for (224.0.0.0/4)
>
> Can someone tell me what the significance of the minus sign (-) that
> precedes the multicast address does?
>
> Thanks,
> Greg
>
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