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When fast leave is disabled – Allied Telesis AR400 User Manual

Page 64

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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 224.12.13.14 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

------------------------------------------------------------------------

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