From: Heiko Liedtke (Heiko.Liedtke@gmx.net)
Date: Wed Jul 19 2006 - 05:16:04 ART
Have you tried to enable RIP for the Interface FastEthernet 0/0 on your router (network 192.168.2.0).
Maybe there is a problem, that the switch will not get any pakets, because
routing fails...
-------- Original-Nachricht --------
Datum: Wed, 19 Jul 2006 12:18:30 +1000
Von: "Alex De Gruiter (AU)" <Alex.deGruiter@didata.com.au>
An: Cisco certification <ccielab@groupstudy.com>
Betreff: Auto-RP messages not received
> Hi,
>
> I am having an issue with PIM Auto-RP in the lab that I can't solve,
> that hopefully someone will be able to shed some light on.
>
> I have a 2600 router connected to a 3750 switch. The relevant
> configuration follows. The problem is that the 3750 switch will not
> install an RP for any multicast groups. When I replace the 3750 switch
> with a router (3800 series, 2600), the RP's are installed as you
> expected.
>
> What I find particularly unusual is that "debug ip pim autorp" on the
> 3750 doesn't indicate any messages, although I can see the RP-Announce
> and RP-Discovery packets being built by the 2600 router:
>
> *Mar 5 20:00:50.448: Auto-RP(0): Build RP-Announce for 172.16.2.1,
> PIMv2/v1, ttl 31, ht 181
> *Mar 5 20:00:50.448: Auto-RP(0): Build announce entry for
> (224.0.0.0/4)
> *Mar 5 20:00:50.448: Auto-RP(0): Send RP-Announce packet on
> FastEthernet0/0
> *Mar 5 20:00:50.448: Auto-RP: Send RP-Announce packet on Loopback0
> *Mar 5 20:00:50.448: Auto-RP(0): Received RP-announce, from 172.16.2.1,
> RP_cnt 1, ht 181
> *Mar 5 20:00:50.448: Auto-RP(0): Added with (224.0.0.0/4,
> RP:172.16.2.1), PIMv2 v1
> *Mar 5 20:00:50.448: Auto-RP(0): Build RP-Discovery packet
> *Mar 5 20:00:50.448: Auto-RP: Build mapping (224.0.0.0/4,
> RP:172.16.2.1), PIMv2 v1,
> *Mar 5 20:00:50.452: Auto-RP: Build mapping (224.9.9.9/32,
> RP:172.16.2.1), PIMv2 v1.
> *Mar 5 20:00:50.452: Auto-RP: Build mapping (224.9.9.10/32,
> RP:172.16.2.1), PIMv2 v1.
> *Mar 5 20:00:50.452: Auto-RP: Build mapping (224.9.9.11/32,
> RP:172.16.2.1), PIMv2 v1.
> *Mar 5 20:00:50.452: Auto-RP(0): Send RP-discovery packet on
> FastEthernet0/0 (1 RP entries)
> *Mar 5 20:00:50.452: Auto-RP: Send RP-discovery packet on Loopback0 (1
> RP entries)
>
> Has anyone seen this before? I know the 3750s aren't part of the lab
> exam, however they're what I have available as part of my studies, so
> I'd like to know if there is something I am doing wrong.
>
> Configuration follows -->
>
> 2600_Router#
>
> !
> ip multicast-routing
> ip pim send-rp-announce Loopback0 scope 31
> ip pim send-rp-discovery Loopback0 scope 31
> !
> interface FastEthernet0/0
> ip address 192.168.2.2 255.255.255.0
> ip pim sparse-dense-mode
> !
> interface Loopback0
> ip address 172.16.2.1 255.255.255.0
> ip pim sparse-dense-mode
> ip igmp join-group 224.9.9.9
> ip igmp join-group 224.9.9.10
> ip igmp join-group 224.9.9.11
> !
> router rip
> version 2
> network 10.0.0.0
> network 172.16.0
>
> 2600_Router#show ip pim rp
> Group: 224.9.9.9, RP: 172.16.2.1, v2, v1, next RP-reachable in 00:00:51
> Group: 224.9.9.10, RP: 172.16.2.1, v2, v1, next RP-reachable in 00:00:51
> Group: 224.9.9.11, RP: 172.16.2.1, v2, v1, next RP-reachable in 00:00:51
>
> 3750_Switch#
>
> !
> ip multicast-routing distributed
> !
> interface Loopback0
> ip address 10.0.0.1 255.255.255.0
> ip pim sparse-dense-mode
> ip igmp join-group 224.9.9.11
> !
> interface FastEthernet1/0/48
> no switchport
> ip address 192.168.2.3 255.255.255.0
> ip pim sparse-dense-mode
> spanning-tree portfast
> !
> router rip
> version 2
> network 10.0.0.0
> network 192.168.2.0
>
> 3750_Switch#show ip pim rp
>
>
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