Multicast:Is CGMP going to help me?

Answered Question
Jul 6th, 2009
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Currently 4507 L3 distribution switches are configured for igmp and respective vlan interfaces configured for igmp v3 as shown below.


Then access-layer switches are connected to L3 4507 distribution. Clients (multicast receivers) are then connected to access-layer 3750 24P switches.


Question:

Currently I have no multicast configured on switches. Do you see any direct benefit if I explore CGMP on the access-layer switches?


(...)

ip muticast-routing distributed

ip multicast multipath

ip multicast rpf interval 1

ip multicast rpf backoff 100 100

ip igmp ssm-map enable

ip igmp ssm-map static list 9.3.3.5

(...)


Correct Answer by Giuseppe Larosa about 7 years 9 months ago

Hello Marlon,

CGMP is legacy your 3750 access switches support IGMP snooping.


The point of attention is that IGMP snooping may be not able to support IGMPv3.


According to the following document IGMP snooping supports IGMPv3 on C3750


For example, if IGMP snooping is enabled on an IGMPv2 switch and the switch receives an IGMPv3 report from a host, the switch can forward the IGMPv3 report to the multicast router.


see

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/configuration/guide/swigmp.html#wp1118473


Hope to help

Giuseppe


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Correct Answer
Giuseppe Larosa Mon, 07/06/2009 - 23:25
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Hello Marlon,

CGMP is legacy your 3750 access switches support IGMP snooping.


The point of attention is that IGMP snooping may be not able to support IGMPv3.


According to the following document IGMP snooping supports IGMPv3 on C3750


For example, if IGMP snooping is enabled on an IGMPv2 switch and the switch receives an IGMPv3 report from a host, the switch can forward the IGMPv3 report to the multicast router.


see

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/configuration/guide/swigmp.html#wp1118473


Hope to help

Giuseppe


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