Enable IGS Globally

By default, IGS is disabled globally. To enable IGS, GMRP must first be disabled.

1. Enter Global Configuration mode, and disable GMRP.

   SEFOS# configure terminal
   SEFOS(config)# set gmrp disable
   

2. Enable IGS globally.

   SEFOS(config)# ip igmp snooping
   SEFOS(config)# end
   

3. Review the configuration.

   SEFOS# show ip igmp snooping globals
    
   Snooping Configuration
   -----------------------------
   IGMP Snooping globally enabled
   IGMP Snooping is operationally enabled
   IGMP Snooping Enhanced mode is disabled
   Transmit Query on Topology Change globally disabled
   Multicast forwarding mode is MAC based
   Proxy globally disabled
   Proxy reporting globally enabled
   Filter is disabled
   Router port purge interval is 125 seconds
   Port purge interval is 260 seconds
   Report forward interval is 5 seconds
   Group specific query interval is 2 seconds
   Reports are forwarded on router ports
   Group specific query retry count is 2
   Multicast VLAN disabled
   Leave config level is Vlan based
   

4. Send an IGMP V2 report to group 227.2.2.2, which is learned on the switch.

   SEFOS# show ip igmp snooping forwarding-database
    
    Vlan  MAC-Address          Ports
    ----  -----------------    -----
       1  01:00:5e:02:02:02    Ex0/1