From: Jonathan V Hays (jhays@jtan.com)
Date: Wed Jun 25 2003 - 18:38:35 GMT-3
The 3550 does *not* have the capability to run CGMP as a client, like
the Catalyst 5000 and other layer 2 switches.
This document
http://www.cisco.com/univercd/cc/td/doc/pcat/ca3550.htm
states the 3550's CGMP capabilities rather nicely:
"Cisco Group Management Protocol (CGMP) server functionality enables a
switch to serve as the CGMP router for CGMP client switches-requires
EMI."
The lack of CGMP client functionality on the 3550 has been replaced with
"IGMP snooping" which "provides for fast client joins and leaves of
multicast streams and limits bandwidth-intensive video traffic to only
the requestors."
And as a layer 3 device the 3550 is fully capable of IGMP functions just
like any other router.
HTH
Jonathan
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Connie Nie
> Sent: Wednesday, June 25, 2003 4:11 PM
> To: 'Hunt Lee'; 'James.Jackson@broadwing.com'
> Cc: 'ccielab@groupstudy.com'
> Subject: RE: 3550:CGMP server vs. client
>
>
> I am not so sure about that:
>
> cat2(config)#int vlan 30
> cat2(config-if)#ip cgmp ?
> proxy CGMP for hosts and proxy for multicast routers
> router-only CGMP proxy for multicast routers only
> <cr>
> Or
> cat2(config)#ip igmp snooping vlan 30 mrouter learn ?
> cgmp Learn the multicast router snooping CGMP packets
> pim-dvmrp Learn the multicast router snooping PIM-DVMRP packets
>
> I am a little confused about the terminology----server vs.
> client, but it
> looks like 3550 can be configured both ways.
>
> Connie
>
>
> -----Original Message-----
> From: Hunt Lee [mailto:huntl@webcentral.com.au]
> Sent: Wednesday, June 25, 2003 12:15 AM
> To: 'James.Jackson@broadwing.com'
> Cc: 'ccielab@groupstudy.com'
> Subject: RE: 3550:CGMP server vs. client
>
> Hi James,
>
> That's correct ;) 3550 only supports CGMP client.
>
> Regards,
> Hunt
>
> -----Original Message-----
> From: James.Jackson@broadwing.com [mailto:James.Jackson@broadwing.com]
> Sent: Wednesday, 25 June 2003 3:09 PM
> To: ccielab@groupstudy.com
> Subject: 3550:CGMP server vs. client
>
>
> I'm trying to understand the level of CGMP support in the
> 3550. Firstly, I'm
> assuming that the CGMP server side refers to the router part
> and the client
> side refers to the switch part. The first statement below
> indicates that
> only the router part is supported. The second statement
> mentions "listening"
> to CGMP - since CGMP messages would typically be sent from
> the router to the
> switch, this tends to imply CGMP client functionality. I'd
> appreciate any
> insight from either authorities or non-authorities :-)
>
> "This software release provides CGMP-server support on your multilayer
> switches; no client-side functionality is provided. The
> multilayer switch
> serves as a CGMP server for devices that do not support IGMP
> snooping but
> have CGMP-client functionality." from:
> http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1211
> 3ea1/3550scg/s
> wmcast.htm
>
> "You can configure the switch either to snoop on IGMP queries
> and PIM/DVMRP
> packets or to listen to CGMP self-join or proxy-join packets" from:
> http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1211
3ea1/3550scg/s
wigmp.htm
Thanks,
James E. Jackson
Data Services Engineering
Broadwing Communications
1212 Capital of Texas Highway South
Austin TX 78746
512.742.1389
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