nanog mailing list archives
RE: IPv4 Multicast
From: Tony Bunce <tonyb () go-concepts com>
Date: Wed, 19 May 2010 00:44:34 +0000
I can see that IGMP is enabled on all interfaces but do I need enable something else?
You need to have a multicast router or enable IGMP querier on one of your switches. For IGMP snooping to work something on the network has to be sending out PIM hellos or IGMP query messages. Without that the switch will flood multicast traffic to all ports "The reason for this issue is that IGMP snooping is not really supported on any Catalyst platform without an mrouter." http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml#understand Note if you go the router method ALL multicast traffic will be sent to the router, so don't expect it to work if you have 5Gbps of multicast connected to a router with a 1Gbps interface. If all your multicast traffic is on the same layer2 network then the IGMP querier feature should work fine. -Tony
Current thread:
- IPv4 Multicast Rens (May 11)
- Re: IPv4 Multicast Mikael Abrahamsson (May 11)
- RE: IPv4 Multicast Rens (May 12)
- Re: IPv4 Multicast Colby Glass (May 18)
- RE: IPv4 Multicast Tony Bunce (May 18)
- RE: IPv4 Multicast Rens (May 21)
- RE: IPv4 Multicast Rens (May 12)
- <Possible follow-ups>
- RE: IPv4 Multicast Jamie Sobczyk (May 21)
- Re: IPv4 Multicast Anton Kapela (May 21)
- Re: IPv4 Multicast Jared Mauch (May 25)
- RE: IPv4 Multicast Rens (May 26)
- Re: IPv4 Multicast Everton Marques (May 26)
- RE: IPv4 Multicast Rens (May 26)
- RE: IPv4 Multicast Rens (May 26)
- txt.att.net operators Mike Walter (May 26)
- Re: txt.att.net operators Christopher Morrow (May 26)
- Re: IPv4 Multicast Mikael Abrahamsson (May 11)