> # Configuring Timer Per-VSAN

> You can also issue the fctimer for a specified VSAN to configure different TOV values for VSANs with special links like FC or IP tunnels. You can configure different E_D_TOV, R_A_TOV, and D_S_TOV values for individual VSANs. Active VSANs are suspended and activated when their timer values are changed.

> Caution | You cannot perform a nondisruptive downgrade to any earlier version that does not support per-VSAN FC timers.

> Note This configuration must be propagated to all switches in the fabric—be sure to configure the same value in all switches in the fabric.

> If a switch is downgraded to Cisco MDS SAN-OS Release 1.2 or 1.1 after the timer is configured for a VSAN, an error message is issued to warn against strict incompatibilities. Refer to the Cisco MDS 9000 Family Troubleshooting Guide.

> ## Detailed Steps

> To configure per-VSAN Fiber Channel timers using Device Manager, follow these steps:

> 1. Click FC > Advanced > VSAN Timers.

> You see the VSANs Timer dialog box.

> 2. Fill in the timer values that you want to configure.
> 3. Click Apply to save these changes.

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