While working on my VMware NSX implementation I wanted to operate the solution in Multicast mode, to do so we need IGMP support and addresses on the switches.
The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships.
Enter the following in configure mode on the VLANs you want IGMP enabled on:
vlan 8
ip address [enter.switch.ip.here]
ip igmp high-priority-forward
Allow some time for queirier to converge, then to verify:
sh ip igmp
Output:
VLAN ID : 8
VLAN Name : NSX
Querier Address : 10.0.8.2
Active Group Addresses Reports Queries Querier Access Port
---------------------- ------- ------- -------------------
224.0.1.140 2 1 Trk4
And also:
sh ip igmp [VLAN ID] config
Output:
Lab-2824-Top(config)# sh ip igmp 8 config
IGMP Service
VLAN ID : 8
VLAN NAME : NSX
IGMP Enabled [No] : Yes
Forward with High Priority [No] : Yes
Querier Allowed [Yes] : Yes
Port Type | IP Mcast
---- --------- + --------
3 | Auto
4 | Auto
5 | Auto
6 | Auto
7 | Auto
8 | Auto
9 | Auto
10 | Auto
11 | Auto
12 | Auto
13 | Auto
14 | Auto
15 | Auto
16 | Auto
17 | Auto
18 | Auto
19 | Auto
20 | Auto
21 | Auto
22 | Auto
23 | Auto
24 | Auto
Trk4 | Auto
Don’t forget to wr mem to save your changes!
Reference: http://ftp.hp.com/pub/networking/software/AdvTraff-Oct2005-59908853-Chap04-IGMP.pdf ↗