Set the Port-Purge Interval

1. Enter the Global Configuration mode.

   SEFOS# configure terminal
   

2. View the multicast forwarding table.

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

3. Set the port-purge interval.

   SEFOS(config)# ip igmp snooping port-purge-interval 130
   SEFOS(config)# end
   

   If an entry is learned on the forwarding database, then after an interval of 130 seconds, the entry is removed from the forwarding database.

4. 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 130 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