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Page 38 | AlliedWare™ OS How To Note: IGMP
IGMP filtering (controlling multicast distribution) > Explanation of IGMP filtering (controlling multicast distribution)
Explanation of IGMP filtering (controlling multicast
distribution)
Immediately after applying the filter, we check the group entries on switch
1
by using the
command show ip igmp, and see that the switch still has an entry for the group we are
filtering out.
This entry is still there because the switch had previously received a report for the group.
Since applying the filter, there have not been any messages for the group, so the switch has
not yet filtered the group out. We can see this by using the command show igmp filter to
check the number of processed messages.
Manager Switch 1> show ip igmp
IGMP Protocol
------------------------------------------------------------------------
Status ........................... Enabled
Default Query Interval ........... 125 secs
Default Timeout Interval ......... 260 secs
Last Member Query Interval ....... 10 (1/10secs)
Last Member Query Count .......... 2
Robustness Variable .............. 2
Query Response Interval .......... 100 (1/10secs)
Disabled All-groups ports ........ None
Interface Name .......... vlan100 (DR)
Group List ..............
Group. 224.0.1.22 Last Adv. 172.31.0.99 Refresh time 192 secs
Ports 1
------------------------------------------------------------------------
Manager Switch 1> show igmp filter=1
IGMP Filters
------------------------------------------------------------------
No. Entry Group Address Action Matches
------------------------------------------------------------------
1 1 224.0.1.22 224.0.1.22 Exclude 0
2 224.0.0.0 224.255.255.255 Include 0
Received: 0 Passed: 0 Dropped: 0
------------------------------------------------------------------------