HP 316095-B21 - StorageWorks Edge Switch 2/24 User Manual page 96

Configuring the Switch
• Rerouting Delay
Placing a check mark in the check box to the left of the Rerouting Delay option
enables rerouting delay. This option is only applicable if the configured switch is
in a multi-switch fabric. The default state is disabled.
Enabling the rerouting delay ensures that frames are delivered in order through the
fabric to their destination. If there is a change to the fabric topology that creates a
new path (for example, a new switch is added to the fabric), frames may be routed
over this new path if its hop count is less than a previous path with a minimum hop
count. This may result in frames being delivered to a destination out of order since
frames sent over the new, shorter path may arrive ahead of older frames still in
route over the older path.
If rerouting delay is enabled, traffic ceases in the fabric for the time specified in
the E_D_TOV field of the dialog box. This delay allows frames sent on the old
path to exit to their destination before new frames begin traversing the new path.
• Domain RSCNs
Use this check box to enable Domain register for state change notifications
(domain RSCNs). Domain RSCNs are sent between end devices in a fabric to
provide additional connection information to host bus adapters (HBA) and storage
devices. As an example, this information might be that a logical path has been
broken because of a physical event, such as a fiber optic cable being disconnected
from a port. Consult with your HBA and storage device vendor to determine if
enabling Domain RSCNs will cause problems with your HBA or storage products.
If Enterprise Fabric Mode is enabled, this parameter is automatically enabled and
cannot be disabled unless the director or switch is offline. Disabling Domain
RSCNs also disables Enterprise Fabric Mode.
3–4 edge switch 2/24 product manager user guide