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:[email protected]] On Behalf Of Scott Voll Sent: Tuesday, March 04, 2014 10:19 AM To: [email protected] 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 _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
