> # Configuring Timer Across All VSANs

> You can modify Fibre Channel protocol related timer values for the switch.

> Caution | The D_S_TOV, E_D_TOV, and R_A_ TOV values cannot be globally changed unless all VSANs in the switch are suspended.

> Note If a VSAN is not specified when you change the timer value, the changed value is applied to all VSANs in the switch.

> To configure timers in DCNM-SAN, expand Switches > FC Services and then select Timers & Policies in the Physical Attributes pane. You see the timers for multiple switches in the Information pane. Click the Change Timeouts button to configure the timeout values.

> To configure timers in Device Manager, click FC > Advanced > Timers/Policies. You see the timers for a single switch in the dialog box.

> This section includes the following topics:

> - Task Flow for Configuring Time Across All VSANs
> - Configuring Timer Per-VSAN
> - Enabling fctimer Distribution
> - Committing fctimer Changes
> - Discarding fctimer Changes
> - Configuring a Secondary MAC Address
> - Configuring Interop Mode 1

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