[Xorp-users] Newbie struggling with Multicast routing

[Roger Truitt]

With my limited Linux skills, I don't know if I'm deciphering the
ip_mr_cache correctly, but if Iif is the vif index, it does not match
the physical index of eth1.

xorp at st-linux1.hatteras.com> show interfaces 
eth1/eth1: Flags:<ENABLED,BROADCAST,MULTICAST> mtu 1500 speed 100 Mbps
        inet 10.10.10.10 subnet 10.10.10.0/24 broadcast 10.10.10.255
        physical index 3 <<<<
        ether 0:e:c:83:12:c7
eth2/eth2: Flags:<ENABLED,BROADCAST,MULTICAST> mtu 1500 speed 100 Mbps
        inet 10.20.20.20 subnet 10.20.20.0/24 broadcast 10.20.20.255
        physical index 2
        ether 0:4:2e:1:e1:9c
xorp at st-linux1.hatteras.com>

If this is the case, how would one correct this mismatch?

I do not have igmp snooping switches in my simple setup yet.  That was
the next step.  I wanted to get just the xorp router working between the
video server and client  before adding a igmp snooping switch to the mix
(baby steps).
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-----Original Message-----
From: Bruce Simpson [mailto:bms at incunabulum.net] 
Sent: Tuesday, September 01, 2009 11:39 AM
To: Roger Truitt; xorp users
Subject: Re: [Xorp-users] Newbie struggling with Multicast routing

Roger Truitt wrote:
> Here's the ip_mr_cache while streaming video into eth1:
>
> [root at st-linux1 rtrmgr]# cat //proc//net/ip_mr_cache
> Group    Origin   Iif     Pkts    Bytes    Wrong Oifs
> 010101EF 010A0A0A 0       3428  4607232        0  1:1  
> [root at st-linux1 rtrmgr]# cat //proc//net/ip_mr_cache
> Group    Origin   Iif     Pkts    Bytes    Wrong Oifs
> 010101EF 010A0A0A 0       6994  9399936        0  1:1  
> [root at st-linux1 rtrmgr]# cat //proc//net/ip_mr_cache
> Group    Origin   Iif     Pkts    Bytes    Wrong Oifs
> 010101EF 010A0A0A 0       9343 12556992        0  1:1  
>
>   

OK, so the MFC looks sane. can you double check these if indexes are 
sane with 'show interfaces' ? Generally the vif indexes should be the 
same as for physical interfaces, however this is not guaranteed.

Do you have any IGMP snooping switches?

Suggest strongly picking up a copy of 'Interdomain Multicast Routing', 
it explains how PIM and IGMP work in great detail.

I have to run. Please Cc: xorp traffic to the lists, I can't respond to 
support requests personally. Thanks.