[126567] in North American Network Operators' Group
RE: IPv4 Multicast
daemon@ATHENA.MIT.EDU (Jamie Sobczyk)
Fri May 21 10:52:24 2010
Date: Fri, 21 May 2010 10:52:02 -0400 (EDT)
From: Jamie Sobczyk <lanson9@cox.net>
To: rens@autempspourmoi.be
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Make sure you have
"ip multicast-routing"
on both routers.
On the router interfaces, make sure you have
"ip pim sparse-mode"
On both routers, make sure you have the same rp address assigned and
that you can ping this ip address from both routers. (I prefer to make
it a loopback interface)
"ip pim rp-address w.x.y.z"
Also, make sure that routing is setup on your routers so that your
receiver can ping your sender.
On your routers you should be able to see the source unicast address and
multicast address by typing "show ip mroute"
you should see something like this:
(*, 239.192.3.47), 7w0d/00:02:59, RP 10.31.0.1, flags: S
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Port-channel15, Forward/Sparse, 7w0d/00:02:59, H
(10.5.9.51, 239.192.3.47), 4w5d/00:03:27, flags: TA
Incoming interface: Port-channel15, RPF nbr 10.7.193.138
Outgoing interface list:
Port-channel17, Forward/Sparse, 4w5d/00:02:49, H
On your switches, with igmp snooping enabled, you should be able to
type:
"show ip igmp snooping group" and see something like
Vlan Group Type Version Port List
-----------------------------------------------------------------------
24 239.192.3.47 igmp v2 Gi1/0/21
That port listed is the port of the requester.
-----Original Message-----
I have setup a lab for this multicast.
VLC receiver - 3560G - 1841 - 1841 - 4503 - VLC sender
The 2 switches only provide L2 access, they have IGMP snooping active
On both 1841's I have pim parse-mode & sap listen on all interfaces +
configured a static RP, the one closest to the sender.
With my VLC receiver I can see the channels via SAP, but when I join the
multicast group I don't receive anything.
Could someone help me to troubleshoot this?
Thanks in advance,
Rens
