Re: Multicast issue

I don't think thats the issue here. It is a multiple access network all
switches can reach eachother directly.
The routers do reply to the traffic altough they configured the same. There
is some sort of difference in joining a group from a SVI interface and a
physical router interfice. I'm trying to find out what it is.
If I enable multicast routing with sparse mode on SW3 it will also reply to
226.1.1.1. But I don;t think that should be nessecary. Its is acting like a
client so I do not want to enable pim on SW3 just link on the oter routers I
have tested.

Anyone any idea what the issue could be here?

2010/8/5 Adrian Brayton <abrayton_at_gmail.com>

> Hey Maarten,
>
> From the looks of your topology, your going to have multiple paths to the
> same source... Have you looked into multicast multipath (I think that is for
> load balancing so it probably doesn't even relate to your issue)? I have
> never tried it myself so I cant say with any certainty whether that will
> help or not.
>
> This example doesn't relate to your specific situation but it might be a
> similar idea... When you set up FR Multipoint, you will run into an issue
> where the physical interface of the "HUB" wont send out multicast traffic to
> one or more of the spokes. So to resolve this issue you need to create
> another interface to send out the multicast traffic "insert tunnel here" so
> now the hub has another interface in which to send out the multicast
> traffic. You will also need to add a static mroute but hopefully you get the
> idea!
>
> Or maybe just a simple static mroute will fix your RPF issues!
>
> HTHs a little but its early and just woke up!
>
>
> On Aug 5, 2010, at 4:13 AM, Maarten Vervoorn wrote:
>
> > 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 - 13:45:27 ART