IGMP (v3) older version querier timer on OSX
IGMP (v3) older version querier timer on OSX
- Subject: IGMP (v3) older version querier timer on OSX
- From: Brandon Applegate <email@hidden>
- Date: Thu, 30 Oct 2014 16:13:04 -0400
* I didn’t see my first attempt at posting show up on the archive - so sending again...
FYI - I first posted this on NANOG but someone recommended I try posting here...
I’m trying to figure out how OSX is behaving with regard to downgrading sent IGMP messages in the presence of “older” queriers. I.e. if a query is heard from a router (querier) that is v2, start a timer and only speak (IGMP) in v2 until it expires. From the definitions I’ve found of how to calculate this timer - that should be 260 seconds. After this time, assuming we haven’t heard any further v2 queries - we can start speaking v3 again. From my testing (using 10.9 Mavericks and the newest VLC) - this doesn’t happen. From the network side, I’m using a Cisco 3750 with snooping and querier turned on (i.e. not a real mcast router).
If I turn these off and reboot, VLC causes IGMP v3 to be sent. If I turn querier back on on my switch - OSX drops down to IGMP v2. It just never seems to bounce back to v3. I think I waited ~ 10 minutes on my last test, and it was still v2.
Thanks in advance for any info.
--
Brandon Applegate - CCIE 10273
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830B 4802 1DD4 F4F9 63FE B966 C0A7 189E 9EC0 3A74
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