Loop on access sw is Affecting distribution switch uplink

[amir2019]

Hi 

we have a branch office  ( 2  Avaya  ERS4826GTS-pwr+ in stack) connected to our HQ .

here the Toplogy 

HQ -----Avaya  ERS4826GTS-pwr+ in stack 1/25---------VLAN238-------1/2/8    ICX7250-24P in stack 

             Avaya  ERS4826GTS-pwr+in stack 2/25--------VLAN238----------2/2/8    ICX7250-24P in stack 

then 

ICX7250-24P in stack1/2/26---------VLAN238-----1/2/1 ICX7250-24P  -------VLAN 237

                                                                                                             ------VLAN 80

                                                                                                             ------VLAN 238

we have multiple loop issue on VLAN 237  but the problem is that UPLINK on Avaya  ERS4826GTS-pwr to HQ goes down  due to this loop !

can you PLease help preventing the loop to affect the Avaya ERS4826GTS as it put down all the site 

[Chandini]

Hi Amir2019

Thank you for reaching us. 

Could you please help me with below details

1. Could you help us with output of "show version" ?
2. When you mean you are seeing loop on access switch is that being received from a end device or could you help us with more details which makes you map the problem to be a loop Issue on access switch ?
3. Are you seeing a specific logs from "show logging" which says more about the issue you are seeing ?

Below are few links you can refer and they help address loop related issues in the network. 

Configuring RSTP (802.1w) and Spanning Tree Best Practices on ICX Switches

• https://community.ruckuswireless.com/t5/RUCKUS-Self-Help/Configuring-RSTP-802-1w-and-Spanning-Tree-B...

How to Enable Loose Loop Detection on ICX

• https://community.ruckuswireless.com/t5/RUCKUS-Self-Help/How-to-Enable-Loose-Loop-Detection-on-ICX/m...

Thanks

[inphobia]

can you perhaps also add a network diagram? it's not clear to me why vlan 237 loops on your avaya's when i don't even see how it's arriving there.
or are the icx devices flooding traffic to all ports during a loop and overloading the avaya's? while not ideal you can use storm control to err-disable the ports until you figure out the loop.