How Do I Fix an MCT Cluster Problem in SLX OS?

onghyr — Wed, 11 Mar 2026 04:30:18 GMT

I am having trouble with the MCT cluster configuration in SLX OS. The cluster does not seem to work correctly and I am not sure if the issue comes from the configuration, synchronization, or the connection between the switches. If anyone has experience setting up or fixing MCT clusters in SLX OS, please share some advice or troubleshooting steps.

Re: How Do I Fix an MCT Cluster Problem in SLX OS?

Nithisha — Fri, 13 Mar 2026 08:08:16 GMT

Hello onghyr,

Please check folowing:
1. ICL port-channel is UP.
2. Keep alive is up.

Sample config of cluster,

#show running-config cluster
cluster Test-cluster-1
peer 10.20.20.4
peer-interface Port-channel 64
peer-keepalive
auto
!
member vlan all
member bridge-domain all
!

#show cluster
Cluster Test-cluster-1
================
Cluster State: Active
Bringup Delay: 90 seconds
Local Bias mode for LVTEP Broadcast: No
Configured Member Vlan Range: All
Active Member Vlan Range: 1
Configured Member BD Range: All
Active Member BD Range:
No. of Clients: 0

Peer Info:
==========
Peer IP: 10.20.20.4, State: Up
Peer Interface: Port-channel 64, Source IP: 10.20.20.5

Keep-Alive:
==========
IP: 10.53.10.20, State: Up
Interface: Management 0 (mgmt-vrf), Source IP: 10.53.10.21
Client-Isolation Role: Primary

Client Info:
============
Interface Id Description Local/Remote State Exceptions
--------- -- ----------- ------------------ ----------

For more information and cluster client, please check section : Configuring MCT
Page 111 onwards
https://documentation.extremenetworks.com/Extreme%20SLX-OS%2020.7.1%20Layer%202%20Switching%20Confi…

Please create a support ticket if further assistance is needed.

Regards,

Nithisha K

topic How Do I Fix an MCT Cluster Problem in SLX OS? in Data Center (MLX & CER/CES)

How Do I Fix an MCT Cluster Problem in SLX OS?

Re: How Do I Fix an MCT Cluster Problem in SLX OS?