Creating new uplinks from Fabric Interconnects

Hi Everyone,

This one has me scratching my head in a dumb founded way, I must be missing something very obvious. We have UCS Blades with FI 6454s connecting to 2 Cisco N5548up's via vpc.I am trying to replace the N5Ks with 2x Nexus C93180YC-EX. We have Pure Storage and was purchased as a Flashstack without the upstream switches from the FIs.

The design guide was followed to setup everything except the N5ks as they were already in production in out other virtual infrastructure environment. I am now following that guide to setup the N9Ks and when bringing the new uplink online to FI-B, Bridge Assurance/Spanning Tree immediately blocks the vlans on the port-channel (The other uplink from FI-B to the N5Ks is disabled before trying to bring the new link online). The same vlans are in use on the N5Ks with no issues.

Config of one of the ports and port-channel

interface Ethernet1/45 description vpc link to fryfi-b switchport mode trunk switchport trunk allowed vlan 130-135 spanning-tree port type normal channel-group 145 mode active no shutdown interface port-channel145 switchport mode trunk switchport trunk allowed vlan 130-135 vpc 145 

I have tried spanning-tree port type edge trunk as per the design guide as well. If I do a single uplink not in a port-channel it works and is not blocked, and if I put that single link in a port-channel it start blocking.

Link to diagram Image of diagram, the C3750X is the root bridge for all vlans except the 2 storage vlans (these are only on the 4 Nexus and FIs) they are all being blocked so don't think its the root bridge causing the issue.