Multicast issue

Hi group,

I have set up a simple multicast network. But somethings seems to be
failing. I think its a silly mistake but I can;t find it. Maybe you can help
me out here?
Setup:
           SW3
             |
---------------------------vlan10 (10.10.10.0/24)
   | |
 SW1 SW2
   | |
----------------------------vlan20 (10.10.20.0/24)
             |
           SW4

SW1 and SW2 are multicast routers, SW1 is the RP and mapping agent
(loopback, 10.10.110.1)
SW3 on vlan 10 is the multicast client (226.1.1.1)
SW4 in vlan 20 is the multicast source
Only the vlan interfaces of SW1 and SW2 are configured sparse mode (with ip
pim autorp listener)

When I ping from SW4 to group 226.1.1.1 it is failing.
On SW1 I see RPF failures
show ip mroute count
Group: 226.1.1.1, Source count: 1, Packets forwarded: 136, Packets received:
231
  RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
  Source: 10.10.20.40/32, Forwarding: 136/1/1/0, Other: 231/230/0
Group: 224.0.1.39, Source count: 1, Packets forwarded: 0, Packets received:
15
  Source: 10.10.110.1/32, Forwarding: 0/0/0/0, Other: 15/15/0
Group: 224.0.1.40, Source count: 1, Packets forwarded: 0, Packets received:
15
  Source: 10.10.110.1/32, Forwarding: 0/0/0/0, Other: 15/15/0

It looks like SW2 has a RPF failure to the RP but I can't see what it is

(*, 226.1.1.1), 00:32:16/stopped, RP 10.10.110.1, flags: SJCF
  Incoming interface: Vlan20, RPF nbr 10.10.20.10
  Outgoing interface list:
    Vlan10, Forward/Sparse, 00:01:26/00:02:35
(10.10.20.40, 226.1.1.1), 00:24:28/00:02:54, flags: FT
  Incoming interface: Vlan20, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan10, Forward/Sparse, 00:24:28/00:02:35
(*, 224.0.1.39), 00:40:50/stopped, RP 0.0.0.0, flags: DC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan20, Forward/Sparse, 00:40:50/00:00:00
    Vlan10, Forward/Sparse, 00:40:50/00:00:00
(10.10.110.1, 224.0.1.39), 00:01:53/00:02:14, flags: PTX
  Incoming interface: Vlan20, RPF nbr 10.10.20.10
  Outgoing interface list:
    Vlan10, Prune/Sparse, 00:00:54/00:02:06
(*, 224.0.1.40), 00:40:58/stopped, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan20, Forward/Sparse, 00:40:58/00:00:00
    Vlan10, Forward/Sparse, 00:40:58/00:00:00
(10.10.110.1, 224.0.1.40), 00:36:11/00:02:33, flags: PLT
  Incoming interface: Vlan20, RPF nbr 10.10.20.10
  Outgoing interface list:
    Vlan10, Prune/Sparse, 00:01:26/00:01:34
SW2 has rp mappings
SW2#sh ip pim rp map
PIM Group-to-RP Mappings
Group(s) 224.0.0.0/4
  RP 10.10.110.1 (?), v2v1
    Info source: 10.10.110.1 (?), elected via Auto-RP
         Uptime: 00:45:27, expires: 00:02:10
!
SW2# show ip mroute count
Group: 226.1.1.1, Source count: 1, Packets forwarded: 31, Packets received:
2
  RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
  Source: 10.10.20.40/32, Forwarding: 31/1/4/0, Other: 2/1/0
Group: 224.0.1.39, Source count: 1, Packets forwarded: 2, Packets received:
4
  Source: 10.10.110.1/32, Forwarding: 2/0/48/0, Other: 4/2/0
Group: 224.0.1.40, Source count: 1, Packets forwarded: 3, Packets received:
7
  Source: 10.10.110.1/32, Forwarding: 3/-1/48/0, Other: 7/2/2
SW2# show ip route
Gateway of last resort is not set
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C 10.10.10.0/24 is directly connected, Vlan10
C 10.10.20.0/24 is directly connected, Vlan20
O 10.10.110.1/32 [110/2] via 10.10.20.10, 00:00:01, Vlan20
                       [110/2] via 10.10.10.10, 00:00:01, Vlan10

Blogs and organic groups at http://www.ccie.net
Received on Thu Aug 05 2010 - 09:46:23 ART