> # Configuring Interop Mode 1

> The interop mode1 in Cisco MDS 9000 Family switches can be enabled disruptively or nondisruptively.

> Note Brocade’s `msplmgmtdeactivate` command must explicitly be run prior to connecting from a Brocade switch to either Cisco MDS 9000 Family switches or to McData switches. This command uses Brocade proprietary frames to exchange platform information, which Cisco MDS 9000 Family switches or McData switches do not understand. Rejecting these frames causes the common E ports to become isolated.

> ## Detailed Steps

> To configure interop mode 1 for a VSAN, follow these steps:

> 1. Choose VSAN xxx > VSAN Attributes from the Logical Domains pane.
> 2. Select Interop-1 from the Interop drop-down menu.
> 3. Click Apply Changes to save this interop mode.
> 4. Expand VSAN xxx and then select Domain Manager from the Logical Domains pane.

> You see the Domain Manager configuration in the Information pane.

> 5. Set the Domain ID in the range of 97 (0x61) through 127 (0x7F).
> 1. Click the Configuration tab.
> 2. Click in the Configure Domain ID column under the Configuration tab.
> 3. Click the Running tab and check that the change has been made.

> Note This is a limitation imposed by the McData switches.

> Note When changing the domain ID, the FC IDs assigned to N ports also change.

> 6. Change the Fibre Channel timers (if they have been changed from the system defaults).

> Note The Cisco MDS 9000, Brocade, and McData FC error detect (ED_TOV) and resource allocation (RA_TOV) timers default to the same values. They can be changed if needed. The RA_TOV default is 10 seconds, and the ED_TOV default is 2 seconds. Per the FC-SW2 standard, these values must be the same on each switch within the fabric.

> 1. Expand Switches > FC Services, and then select Timers and Policies. You see the timer settings in the Information pane.
> 2. Click Change Timeouts to modify the time-out values.
> 3. Click Apply to save the new time-out values.
> 7. (Optional) Choose VSAN xxx > Domain Manager> Configuration and select disruptive or nonDisruptive in the Restart column to restart the domain.

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