Re: Help with IGMP
- From: "Thrill5" <nospam@xxxxxxxxxxxxx>
- Date: Mon, 27 Oct 2008 19:27:55 -0400
IGMP is only one half of the equation when configuring multicast. IGMP is
the layer 2 protocol to allow switch interfaces to join multcast streams.
If the multicast source is on a different subnet/VLAN you must also have PIM
(Protocol Independent Multicast), and multicast routing enabled on your
layer 3 routers. You also need to configure an RP ("Rendezvous Point")
somewhere on your network. Without knowing more details of your network, I
can't offer any configurations, but is pretty simple to configure. Search
PIM, and auto-RP for more info.
"John Oliver" <joliver@xxxxxxxxxxxxxxx> wrote in message
news:slrnggcfm9.mb4.joliver@xxxxxxxxxxxxxxxxxxxxxxx
I'm facing some issues with IGMP, but unfortunately know next to nothing
about it. The extent of my knowledge is that adding and removing
verious iterations of 'ip igmp snooping' globally or per VLAN sometimes
results in a working config :-)
We have several 2960s that feed small streaming networks, with one or
more VOD or other streaming video server. Those servers have various
test clips, video sent by customers for troubleshooting, etc. We just
got in a big satellite dish that has feeds for several channels, and i'm
trying to reliably get the video from it.
Behind the receivers for the dish is a 48 port 2960. Someone added a
crossconnect from that switch to one of the streaming networks. It
looked like traffic from the streaming network was flooding onto the
satellite distribution switch... Wireshark showed a lot of stuff with
source addresses that I recognized as being on that streaming network.
I thought that, with IGMP, you had to specifically "join" a "channel",
so I'm not sure why this happened. All of that traffic seemed to bring
the satellite switch to it's knees... no hosts on it could ping each
other, and we could not play any video signals with VLC on a laptop
connected directly to that switch.
Once I removed that crossconnect, things improved. One laptop with VLC
was able to play Animal Planet HD, but it was extremely choppy...
horrible pixelation, short "freezes", etc.
I connected another laptop, and if I start to play Animal Planet HD, I
can see 8.9 Mb/s of traffic coming in, but it just sits on one frame. I
cannot play any othere channels. After a few minutes, VLC bombs out and
wants to send it's useless error report of into the ether.
I realize I'm not giving a lot of useful info here, but I have no idea
what else could be pertinent. I can find my way around IOS, but I know
nothing about multicast. I could use any suggestions on how to
correctly set up a Cisco switch for multicast, or any pointers to
material that might help.
--
* John Oliver http://www.john-oliver.net/ *
.
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