Multicast - AutoRP and NBMA problem.

Hello everyone,
 I been stuck trying to figure out this one problem i have in the lab. I
have a FR cloud where the mapping agent is one of the spokes and a cRP are
behind the hub. I have ip pim nbma-mode configured on the hub (R5), i've
tried to disable all other spokes except the mapping agent, i'm running ip
pim autorp listener on all interfaces and ip sparse-mode (except loopbacks)
.No one is able to get any RP mappings. What is interesting is when I clear
the mroute on the FR hub, everything works but for only 30 sec until the
mappings expire. I've been trying to figure this out for a while but i'm
getting no where and I need to get this one before I can move on to the next
lab.

Below are some details and troubleshooting steps i've taken.

Topology
[R1] (MA) s0/0/0.1 ----FR----> s0/0/0 [R5] gi0/0 -----> vlan58 [SW2] (cRP)

1. Pim Neighbors - looks ok.
------------------------------------------------------------

R1#sh ip pim neighbor | i 5
155.1.0.5 Serial0/0/0.1 12:35:27/00:01:30 v2 1 / S

R5#sh ip pim neighbor
..
155.1.58.8 GigabitEthernet0/0 13:02:33/00:01:21 v2 1 / DR S
155.1.0.1 Serial0/0/0 12:35:48/00:01:26 v2 1 / S

SW2#sh ip pim neighbor
..
155.1.58.5 Vlan58 13:03:00/00:01:43 v2 1 / S

2. IP Mroute for 224.0.1.39
------------------------------------------------------------
For R5 looks ok to me.

*R5*#sh ip mroute 224.0.1.39 | b \(
(*, 224.0.1.39), 00:15:23/stopped, RP 0.0.0.0, flags: D
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial0/0/1, Forward/Sparse, 00:15:23/00:00:00
    Serial0/0/0, Forward/Sparse, 00:15:23/00:00:00
    GigabitEthernet0/0, Forward/Sparse, 00:15:23/00:00:00

(150.1.8.8, 224.0.1.39), 00:15:17/00:02:59, flags: T
  Incoming interface: GigabitEthernet0/0, RPF nbr 155.1.58.8
  Outgoing interface list:
    Serial0/0/0, Forward/Sparse, 00:15:17/00:00:00 <------- FR interface
    Serial0/0/1, Prune/Sparse, 00:02:37/00:00:22

When I checked the mroute for 224.0.1.39 on the mapping agent R1, that's
where things look little bit off, it doesn't see any of the cRP joining the
224.0.1.39.

*R1*#sh ip mroute 224.0.1.39 | b \(
(*, 224.0.1.39), 12:07:34/00:02:50, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial0/0/0.1, Forward/Sparse, 12:07:34/00:00:00
    Loopback0, Forward/Sparse-Dense, 12:07:34/00:00:00

I checked RPF for SW1 from R1 and it looks ok
*R1*#sh ip rpf 150.1.8.8
RPF information for ? (150.1.8.8)
  RPF interface: Serial0/0/0.1
  RPF neighbor: ? (155.1.0.5)
  RPF route/mask: 150.1.8.0/24
  RPF type: unicast (ospf 1)
  RPF recursion count: 0
  Doing distance-preferred lookups across tables

I even check using mtrace and it looks ok to me
*R1*#mtrace 150.1.8.8
Type escape sequence to abort.
Mtrace from 150.1.8.8 to 155.1.0.1 via RPF
From source (?) to destination (?)
Querying full reverse path...
 0 155.1.0.1
-1 155.1.0.1 PIM [150.1.8.0/24]
-2 155.1.0.5 PIM [150.1.8.0/24]
-3 155.1.58.8 PIM [150.1.8.0/24]
-4 150.1.8.8

I'm really stuck here without any ideas, been working on this for a while
and still can't come up with any solutions, any help would be appreciated.

thank you,

Tom K.

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Received on Sat Jun 05 2010 - 10:46:44 ART