From: Brian McGahan (brian@cyscoexpert.com)
Date: Tue Sep 17 2002 - 20:59:59 GMT-3
This new search engine really rocks...
http://www.groupstudy.com/archives/ccielab/200209/msg00021.html
"3550 does not support client side CGMP like the Cat5k, however
it does support CGMP on the server side when acting as a multicast
router. See this link for details:
http://cisco.com/univercd/cc/td/doc/product/lan/c3550/1219ea1/3550scg/sw
mcast.htm#xtocid16
For L2 client functionality, 3550 uses IGMP snooping and
Multicast VLAN Registration (MVR). IGMP snooping is enabled by default.
See this link for more detail:
http://cisco.com/univercd/cc/td/doc/product/lan/c3550/1219ea1/3550scg/sw
igmp.htm"
Edward,
Throw your preconceived notions about switches out the window.
Think of this "switch" as a multiport router. CGMP is supported from
the server side, the same as saying "ip cgmp" on your router's Ethernet
interface. If you were to connect this switch to another access layer
switch such as a Cat5k, and run CGMP, the 3550 would be acting as the
multicast router in this model.
Host A sends IGMP join to 3550 about group X
3550 sends CGMP message to 5000 about host A joining group X
5000 adds group X to the cam table of host A's corresponding port
3550 == multicast router
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Edward Monk
> Sent: Tuesday, September 17, 2002 11:34 AM
> To: ccielab@groupstudy.com
> Subject: CGMP compatibility mode on 3550?
>
> Group,
>
>
>
> I was going over the 3550 documentation to make sure I was familiar
with
> the similar functionality between it and a 5000.
>
>
>
> I thought in order to make the 3550 act like a layer 2 device with
only
> CGMP all I had to do was enable it at the interface I wanted CGMP to
run
> on. After reading the documentation on this I am not so sure. I don't
> have a 3550 to test this on so I am looking for someone to help me out
> to either confirm or disprove what I was thinking.
>
>
>
> The documentation says to only enable it on a layer 3 interface
> connected to a layer 2 Catalyst switch? This is what has lead me to
> question what I was thinking would be a compatible mode of operation.
>
>
>
> This is found under the URL that follows in subsection "Enabling CGMP
> Server Support".
>
>
>
> Anyone have any ideas on this?
>
>
>
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1218ea1/3550sc
> g/swmcast.htm#97077
>
>
>
>
>
> Thanks,
>
>
>
> Ed
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