From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Sun Jun 22 2008 - 11:35:08 ART
Hi Mujeeb,
The mapping agent should not filter all groups simply because you denied
a particular group in an "ip pim send-rp-announce <int> <acl>" command.
Instead it should advertise the permitted and denied groups together;
"show ip pim rp map" should see a minus in front of the denied range.
If you use a deny statement then, assuming no other C-RP offers to
service the group, the specified group is treated as a dense mode
group. If you add a second candidate RP which is willing to act as RP
for the group, then I think the behaviour you see may depend on the
router ios versions used. Recent versions accept the second C-RP's
announcement, but I don't think that used to happen in old 12.2 versions
(may be wrong though).
There seems to be a little confusion here about what you have
configured, perhaps if you post your configs and results it may make
things a little clearer.
Paul.
Sadiq Yakasai wrote:
> Mujeeb,
>
> What you are seeing it the expected normal behaviour there.
>
> Sadiq
>
>
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>
Puneet Kathpalia wrote:
> Deny statements in an acl associated with the group-list option of ip pim
> send-rp-announce command does not work. It is well documented in the IEWB
> COD. Therefore, yes this is normal behavior as deny statements not "allowed"
> with the group-list option.
>
> HTH :)
>
> Puneet
>
Geert Nijs wrote:
> All i know is that this command behaves very strangly - against intuition.
>
> Use this command with caution. RPs that are matched by rp-list (allowed by a permit statement) have their multicast groups filtered by group-list. RPs that are denied (either by an explicit or implicit deny) are not subject to the filtering of their multicast groups and are "blindly" accepted as candidate RPs for all of their groups. In other words, only RPs that are permitted by rp-list have their multicast-groups filtered by group-list. All other RPs are accepted without examination.
>
>
> regards,
> Geert
> CCIE #13729
>
Mujeeb Sarwar wrote:
> Dear Group,
>
> I have a query regarding filtering of RP to Group mapping. Let suppose
> following is the topology,
>
>
> R3 ------- R2 -------- R1
>
> R3 & R2 are candidate RPs and R1 is the mapping agent. We have to filter RP
> to Group mapping at R1 which we can do using rp-announce-filter with rp-list
> and group-list options at mappping agent and parallely using
> send-rp-announce with group-list option at candidate RPs.
>
> Problem is that if I use deny statement in ACL on candidate RP to filter
> some specific group and announce all other groups then mapping agent filters
> all groups regardless of what is pemited/denied on candidate RP.
>
> But on the other hand if I use permit statement in ACL on candidate RP to
> allow specific groups then mapping agent works fine and do specific group
> mappings.
>
> Is this normal behavior or I am missing something ?
>
>
> Regards,
>
> Mujeeb
>
>
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