Multicast Helper-map issue

I am having an issue getting the ip helper-map to work and after going over
my configs 3 or 4 times am still not sure what the problem is. Any hints or
pointers in the right direction would be greatly appreciated. I am trying
to get one router to send a RIPv2 broadcast which should be picked up by
another router, translated using the multicast helper-map to 224.1.1.1 and
then sent across an OSPF domain where it is converted back to a broadcast at
the other side and received by another RIP router.

*The setup:*

I have 5 routers setup in a straight line R1 <> R2 <> R3 <> R4 <> R5.
Multicast routing is enabled on R2, R3 and R4.

R2, R3 and R4 are all running PIM sparse mode on their loopbacks and their
interfaces facing each other.

R1 and R5 are speaking RIPv2 and R2, R3 and R4 are using OSPF. I am trying
to get R5 to receive RIP routes from R1.

R1 has the v2-broadcast turned on on its interface facing R2. R2 is able to
see these broadcasts with a packet debug.

R2 is the BSR and RP for the three routers running OSPF, multicast routing
is not enabled on R1 or R5.

The helper map is configured on R2's interface fa0/0 which is facing R1 and
should take RIP broadcasts and convert them to the 224.1.1.1 group.

There is another helper-map on R4's fa0/1 interface which faces R3 and is
configured to receive the 224.1.1.1 group and send a broadcast to
10.1.45.255.

IP Directed-broadcast is enabled on R4's fa0/0 interface facing R5.

R5 is configured with no validate-update-source to prevent it from dropping
any packets that appear from R1's 10.1.12.1 address.

*The problem:*

When I debug IP mpacket and debug IP packet on R2, I am able to see the RIP
broadcasts from R1, but it appears that they are never sent out as the
224.1.1.1 multicast address

R5 never receives any packets from R1, a debug IP mpacket on R2 R3 and R4
show no packets to 224.1.1.1 ever being sent anywhere.

*The configs:
*
R1:

interface FastEthernet0/0
 ip address 10.1.12.1 255.255.255.0
 ip rip v2-broadcast

router rip
 version 2
 network 1.0.0.0
 network 10.0.0.0
 no auto-summary

R2:

interface FastEthernet0/0
 ip address 10.1.12.2 255.255.255.0
 ip multicast helper-map broadcast 224.1.1.1 100 ttl 4
!
interface FastEthernet0/1
 ip address 10.1.23.2 255.255.255.0
 ip pim sparse-mode
!
router ospf 100
 network 2.2.2.2 0.0.0.0 area 0
 network 10.1.23.2 0.0.0.0 area 0
!
ip forward-protocol udp rip
!
ip pim bsr-candidate Loopback0 0
ip pim rp-candidate Loopback0
!
access-list 100 permit udp any any eq rip

R3:

interface FastEthernet0/0
 ip address 10.1.23.3 255.255.255.0
 ip pim sparse-mode
!
interface FastEthernet0/1
 ip address 10.1.34.3 255.255.255.0
 ip pim sparse-mode
!
router ospf 100
 network 0.0.0.0 255.255.255.255 area 0

R4:

interface FastEthernet0/0
 ip address 10.1.45.4 255.255.255.0
 ip directed-broadcast
 ip igmp join-group 224.1.1.1
!
interface FastEthernet0/1
 ip address 10.1.34.4 255.255.255.0
 ip pim sparse-mode
 ip multicast helper-map 224.1.1.1 10.1.45.255 100
!
router ospf 100
 network 4.4.4.4 0.0.0.0 area 0
 network 10.1.34.4 0.0.0.0 area 0
!
ip forward-protocol nd
ip forward-protocol udp rip

R5:

interface FastEthernet0/0
 ip address 10.1.45.5 255.255.255.0
!
router rip
 version 2
 no validate-update-source
 network 10.0.0.0
 no auto-summary

*The shows and debugs:

*
From R2 with debug ip packet and mpacket enabled, notice no packets to
224.1.1.1 are ever sent:

*Mar 1 01:29:53.599: IP: s=10.1.12.1 (FastEthernet0/0), d=255.255.255.255,
len 52, rcvd 2
*Mar 1 01:29:53.603: UDP src=520, dst=520

From R4:

R4(config-if)#*do sh ip mroute*

IP Multicast Routing Table
<output omitted>

(*, 224.1.1.1), 01:21:43/00:02:57, RP 2.2.2.2, flags: SJCL
  Incoming interface: FastEthernet0/1, RPF nbr 10.1.34.3
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse, 00:41:58/00:02:54

(*, 224.0.1.40), 01:24:27/00:02:52, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Loopback0, Forward/Sparse, 01:24:27/00:02:52

R4(config-if)#*do sh ip pim rp map 224.1.1.1*

PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4
  RP 2.2.2.2 (?), v2
    Info source: 2.2.2.2 (?), via bootstrap, priority 0, holdtime 150
         Uptime: 01:24:07, expires: 00:01:48

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Received on Sat Nov 14 2009 - 12:51:07 ART