jrhett at svcolo
Jan 30, 2008, 12:01 PM
Post #4 of 9
On Jan 20, 2008, at 7:29 AM, Marcin Kuczera wrote:
> I have a question about construction of BlackDiamond 6808 switch.
> Does it have passive or active backplane ?
Passive in theory, but keep in mind that the MSMs use a special
connector to talk to each other. In two different chassis we've seen
that connector part fail, and the MSMs stop communicating. When this
happens, both become "active" and the switch effectively segments
into two. But because the routing table is the same, it really just
bit-buckets all the outbound traffic that's on the other MSM's port.
> BD6808 may have 2 MSM modules - so, redundant.
> - but - is the "switch" also redundand (a part of MSM or port
> modules ?) ?
It's really redundant, except for the failures related to msm<->msm
> I know that BD6808 is not the best platform (based on ExtremeWare,
> not the
> ExtremeOS), however we use it just for L2 - and.. can't afford for
> new/expansive devices.
Heh, I have three or so of them fully stocked with G8Xi and 48Ti
cards I'd be happy to sell you, very cheap. Two of these had their
backplanes recently replaced to solve the msm communication failure I
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