How to calculate the expiry time of IGMPSNP/MVR entry on ECS4100 series ?

Steven_zhang • Created at：Dec 11, 2019 11:20:14 • Updated at：Dec 11, 2019 11:20:18

When a group's timer expires then it will be removed from IGMPSNP group table /MVR member table, therefore, this group's multicast traffic will stop forwarding.

Once the switch received the group’s IGMP report packet, then the timer will start to calculate or renew. 

 

IGMP snooping:

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IGMPSNP Expire time = Last Member Query Count x Query Interval + Query Response Interval

 

For Example:

Default: 125 x 2 + 10 = 260 seconds = 4 minutes and 20 seconds 

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MVR:

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MVR Expire time = MVR Robustness Value x MVR Proxy Query Interval + 10 seconds (static)

 

For Example:

Default: 125 x 2 + 10 = 260 seconds = 4 minutes and 20 seconds

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Notice: Enable/Disable "MVR Proxy Switching" will not affect to expire time.


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