Wired Intelligent Edge

Have a simple network, with core being stack of Comware based 4 x 5900AF, which does the routing

Each edge cabinet (with Aruba 2920 stacks with latest firmware WB_16_10_0011) connects via single direct fibre OM4 10Gb to the core

All works fine, but as I have some spare (different route between buildings) fibre links available between cabinets, I would like to connect edge cabs between themselves for redundancy.

Last time I did that, all hell broke lose, core lost communication to almost all the cabs, even one of the Hyper-V directly connected to the core dropped off. To get it all back to working state had to drastically reboot the edge cabs & even the core!

Spanning tree is enabled on all switches, as is loop protection (per Vlan)

Core is (and was) definitely a root bridge

What else am I missing (having a blackout, sorry) to have the links between (just in case the main one goes down)

Thanks

Seb

Hi Seb, how the Spanning Tree (both on Core and Edge) was exactly configured in your topology?

Using this:

https://community.hpe.com/t5/Comware-Based/Spanning-Tree-Problem/td-p/6175625#.YDOVyeigIuU

Procurve:

spanning-tree enable
spanning-tree mode mstp
spanning-tree force-version rstp-operation

Comware:

stp global enable
stp mode rstp
stp instance 0 root primary

stp pathcost-standard dot1t

Seb

Anybody?