07-26-2009 09:59 AM - edited 03-06-2019 06:56 AM
after reading a few pdfs, the rule of thumb is, if using legacy switches use CGMP otherwise IGMP snooping is the way to go. Is that correct?
07-26-2009 10:24 AM
Hi Alex,
Yes,Older boxes like 2900XL/3500XL, 2948 and 1900 support CGMP.
Here is a metrix of Cat switches that support IGMP and CGMP:
http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080122a70.shtml
HTH
Reza
07-26-2009 01:00 PM
Reza,
Thanks, that is a very useful link!
Also, it should be stressed that the CGMP is Cisco-proprietary protocol and must be supported both by switch AND router. In CGMP, it is the router that controls the switch using CGMP. Without a CGMP-compliant router, the switch will not provide any optimized multicast delivery, and will flood all multicast packets out every port except the inbound port.
Best regards,
Peter
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