I am trying to interconnect a pair of Nexus 5548 at adjacent sites, using 2 2960-S switches at each site, the reason being that the Multimode Fiber between the sites will only support 100mb and I need this up while I finish having SMF laid.
I have attached a diagram, just debating whether to use etherchannel or vPC - would like to hear some opinions...
Assume the interconnect between the 5548's needs to be 802.1q trunk
I am actually in the middle of a data center conversion, in which we have just installed dual 5548UP's and they are currently trunking to stacked 3750's. In my case since they were stacked I configured a vPC on the 5K side and a Port-channel on the 3750's side. Since your's are not stacked I would suggest not configuring the vPC links and instead configuring typical ether-channel. If it were me I would treat the 5K's as if they were just standalone 2960's. The whole concept behind vPC was to prevent the blocking of source ports on seperate switches because of spanning-tree. In your case that is not coming into play; if you had 2 5K's into a single 2960 that would have a configured port -channel then i would use a vPC. If you want to control which port on the 2960's is not blocked use port priority with spanning tree and you will keep the quickest route to distribution or core layers (not sure what the rest of your topology looks like) while also maintaining failover in the event the primary link fails.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
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