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Re: Auto RP filtering posted 07/16/2007
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Eric

You've lost me. I understood the command "ip pim rp-accept" to be for
filtering pim join/prune messages from downstream PIM routers to the RP (RP
is already known). How does it fit in with the RP selection process?

Ben



On 7/16/07, Eric Dobyns <eric_dobyns@xxxxxxxxx> wrote:
>
> This command might give you what you need:
> no ip pim accept-rp {rp-address | auto-rp} [access-list]
>
>
> -----Original Message-----
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
> Gregory Gombas
> Sent: Monday, July 16, 2007 9:12 AM
> To: Antonio Soares
> Cc: Group study
> Subject: Re: Auto RP filtering
>
> 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@xxxxxxxxxx> 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@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] 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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