IGMP fast-leave|
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Posted by Mark on May 29, 2009, 3:28 am
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trying to understand how "fast-leave" works; I do realize it's related to IGMP Leave messages and how they are processed by IGMP aware switches, but no more. RFC2236 mentions this term only one time, without further explanations. As I understand, "fast-leave" (or as some manufacturers call it "immediate leave") isn't standard? Would someone be so kind to explain me the machinery of this procedure? -- Mark | |||||||||||||
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Posted by Stephen on May 29, 2009, 4:56 pm
Please log in for more thread options >RFC2236 mentions this term only one time, without further explanations. As I
>understand, "fast-leave" (or as some manufacturers call it "immediate >leave") isn't standard? RFC 2236 says a host"may" send a fast leave when leaving a group, so it isnt mandatory, but many client IP stacks always send it when exits a group. >
>Would someone be so kind to explain me the machinery of this procedure? a host sends a leave to "all routers" multicast. The router then sends a group specific query(s) to see if any hosts are left, and removes the group if there is no reply. AFAIR default is 1 sec timeout and 2 queries, so the group should get dropped after 2 sec or so. -- Regards stephen_hope@xyzworld.com - replace xyz with ntl | |||||||||||||
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Posted by Mark on June 3, 2009, 1:57 am
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>>Would someone be so kind to explain me the machinery of this procedure?
>
> a host sends a leave to "all routers" multicast. > The router then sends a group specific query(s) to see if any hosts > are left, and removes the group if there is no reply. So the gist of fast-leave is not to wait til group membership timers on multicast routers have expired, but quickly send a group-specific query and if not report were received, remove the group? Is it the same way how Layer2 devices implement fast leave (sometimes called immediate-leave) ? > AFAIR default is 1 sec timeout and 2 queries, so the group should get
> dropped after 2 sec or so. -- Mark | |||||||||||||
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>
>trying to understand how "fast-leave" works; I do realize it's related to
>IGMP Leave messages and how they are processed by IGMP aware switches, but
>no more.
>