From: Alex De Gruiter \(AU\) (Alex.deGruiter@didata.com.au)
Date: Tue Jul 18 2006 - 23:18:30 ART
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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