Re: Multicast issue

Its seems it has something to do with the SW3 client switch. When I
configure a client router on the same segment (VLAN10) it does respond to
the 226.1.1.1,
but what are all those RPF failures?
Why is SW3 not responing?
it almost the same configuration SW3 has configured a IGMP join on the SVI
interface and the router on a physical interface.

Can anyone help me clarify this

Kind regards,

Maarten Vervoorn

2010/8/5 Maarten Vervoorn <mr.vervoorn_at_gmail.com>

> 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

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Received on Thu Aug 05 2010 - 10:13:54 ART