[c-nsp] 3750E to stack of 2960x.....

[Chuck Church]

Are the physical links up?  They see each other via CDP?   If so, are the
channels up (assuming LACP or PAgP)?  If those are up, check spanning tree
on both sides.  Could be a disagreement on channels or native VLAN, or
something err-disabled.

Chuck

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
Scott Voll
Sent: Tuesday, March 04, 2014 10:19 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] 3750E to stack of 2960x.....

I have a building that has a 3750E at the core and access layer with some
new 2960X's

I have both a stack of two and a single.

Both have a port channel up to the 3750E.

Both have now lost there uplinks to the 3750E within two days of being
installed.

Anyone have any ideas as to what to look for?

I see nothing in the syslogs of either the 2960x or the 3750E.

I'm thinking Spanning tree?  or VTP?  or ??????

Areas you would look at?

TIA

Scott
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