[c-nsp] Simultaneous drops - 2 upstream providers

[Blake Dunlap]

You don't give too much information here, so its hard to speculate.

My guess as to the first thing to check would be out of buffer drops on the
37x, but like I said above, it's only really a wild guess, since you don't
specify port layout or link speeds. You can verify by looking at the ASIC
stats, as the interface stats can be unreliable for that type of drop.

-Blake


On Mon, Aug 19, 2013 at 9:11 PM, CiscoNSP List <cisconsp_list at hotmail.com>wrote:

> Hi - bit of a strange one - We have 3 interpop links (3 different
> carriers) terminating on a 3750X+ASR at one of our POPs, and are seeing
> intermittent drops on 2 of the links(And ospf loses adjancency) at the same
> time
> Carrier A - POPA -> POPB - We see drops/ospf adjancency issues once/twice
> a dayCarrier B - POPA -> POPC - We see drops/ospf adjancency issues
> once/twice a dayCarrier C - POPA -> POPB - No issues at all
> All links terminate on the same 3750, and then are trunked to an ASR1006
> for L3 - There are no errors/physical link issues on the 3750, and both
> carriers also do not see any errors/link drops.
> It would be improbable that both carriers have issues on there networks at
> precisely the same time, so it is either our switch(3750), or something
> weird happening with the x-connects that doesnt cause the links to drop,
> doesnt cause any errors etc, but causes ospf to lose adjacency (but only
> for 2 providers, not the third?)
> Any suggestions/assistance is greatly appreciated
>
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