Welcome to Dell Technologies Connectrix Brocade B-Series - Break Fix Series.
ISL segments with "Incompatible Long distance mode" reason. Reference Dell Knowledge Article number 064075. This video was created to demonstrate how to find out a mismatch in the fabric parameter Long distance mode between two switches and rectify it on the switch that is merging into the existing fabric.
This video presents the following: An inter-switch link is a link between two switches, E_Port-to-E_Port. The ports of the two switches automatically come online as E_Ports once the login process finishes successfully.
When connecting two switches together, Brocade recommends the best practice that the following parameters are differentiated: Domain ID. Switch name. Chassis name.
You must also verify the following fabric parameters are identical on each switch for a fabric to merge: Resource Allocation TimeOut Value. Error Detect TimeOut Value.
Data Field Size. Sequence Level Switching. Disable Device Probing. Suppress Class F Traffic. Per-frame Route Priority. When to do this: Switch is segmented due to Incompatible Long distance mode.
Fabric parameters mismatch between switches. The following can be observed in the outputs. Before you begin: Verify the Long distance fabric setting on both the switches.
On the switch that is merging into the existing fabric, perform the following: switchdisable. configure. Input "yes" at Fabric parameters. Set the Long Distance Fabric to match the peer switch.
And then, switchenable. Switch-1 and Switch-2 are segmented due to Incompatible Long distance mode. Run "islshow" and "switchshow" to check the error message.
Search the error stream "incompatible Long distance fabric" in error dump output. Check the Long distance fabric parameter on both the switches.
Note the Long distance parameter is not the same on both of the switches. On the switch that is merging into the existing fabric, perform the following: Disable the switch. Run the configure command. Input "yes" at the Fabric parameters. And then answer as prompted.
Set the "Long Distance Fabric" value to zero to match the peer switch. Enable the switch. Run "switchshow" to verify that E_Ports have come back online. Run "fabricshow" to verify that the switches are merged into the same fabric.
Refer to the following for more information.
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