Hi all,
I am deaing with a situation where two 3810M "spine" switches are uplinking to Cisco. The spine(s) have a number of VLANs configured which are serving only downstream clients of the switches (ports 1-15, tagged on all VLANS).
Downstream, we have three 3810M(s), each uplinked with two ports (1/15,1/16) to the spine switch with all VLANs tagged on those two ports and the remaining ports on each switch untagged for client devices.
Port 16 on each spine switch is uplinking to a Cisco switch of unspecified type and it is set as untagged on only the VLAN which needs to uplink.
Aruba network is functioning perfectly. All clients on downstream switches maintain connectivity.
On the uplinks, For years, no collisions, no problems and connecitvity could be established through either spine. That is to say, if one spine went down or was powered off, connectivity would switch gracefully to the other spine.
All of a sudden, after a sequential reboot of both spine switches, colissions, dropped packets and loss of connecticity between Cisco and Aruba. What could cause this?
Here is the relevent config for the switches, each is set with a decending Spanning-Tree priority, with the Spine 0&1 and the client 2-4:
vlan 10
name "Uplink"
untagged 16
tagged 1-15
no ip address
exit
spanning-tree
spanning-tree priority 0