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Page 64 | AlliedWare™ OS How To Note: IGMP
IGMP fast leave > Explanation of IGMP fast leave
When fast leave is disabled
The IGMP Snooper sees the Membership Query from the Querier and accordingly sets its
expiry time to match the Querier. Output of the command show igmpsnooping on
switch 3 shows that the timeout for the group 224.
1
2.
1
3.
1
4 has dropped to 2 seconds and
that port 3 is still attached to the group. Likewise, output of the command show ip igmp on
switch
1
shows a timeout of 2 seconds.
If no Membership Report is received by the time the counters go to zero, then the client’s
entry is dropped from both the IGMP Querier and Snooper.
Manager Switch 3> show igmpsnooping
IGMP Snooping
------------------------------------------------------------------------
Status ........................... Enabled
Disabled All-groups ports ........ None
Vlan Name (vlan id) ..... default (1)
Fast Leave .............. Off
Group List ..............
No group memberships.
Vlan Name (vlan id) ..... vlan100 (100)
Fast Leave .............. Off
Group List ..............
Group. 224.12.13.14 Entry timeout 2 secs
Ports 3
All Groups Entry timeout 258 secs
Ports 26
------------------------------------------------------------------------
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. 224.12.13.14 Last Adv. 172.31.0.222 Refresh time 2 secs
Ports 49
------------------------------------------------------------------------