ICX7450 switch STP Loop

[prasad_kawadkar]

We have ICX 7450 switch as distribution switch and below that we have 5 nos HP 5120 as access switches  in a Ring Topology. We have connected one port of 7450 to HP Access switch one and another is connected to access switch 5. If i connect both the link i found STP loop and if i disconnected one of the link, the network found stable. Earlier it was Cisco switch and now we are replacing the same with Brocade.
Please suggest.

[david_chavarria]

Did you make sure to enable 802.1w rapid spanning tree on the ICX 7450 and assigning the ports going to the HPs as "admin pt2pt mac"  ?

[david_ellis_h2n]

If you are running routing code, spanning-tree is not enabled by default. It is enabled by default on CIsco and HP switches.

[prasad_kawadkar]

Hi I have already configured the command but still has a issue...
interface ethernet 1/2/2
port-name ###UPLINK_TOWARD_10.11.64.21###
spanning-tree 802-1w admin-pt2pt-mac
dual-mode
!

[chris_hill_4zpl]

I'm assuming 1/2/2 is one port leading to one of the HP switches (1). Is the other port leading to switch 5 also configured with the same spanning-tree configuration?