Edge Switch 2/24 installation guide 47
CAUTION: If a switch with a duplicate domain ID exists in the fabric, both switches' E_Ports will
segment when they try to join.
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 multiswitch fabric. The default
state is enabled.
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 Configure Fabric Parameters dialog box. This delay allows frames sent on the old path to exit
to their destination before new frames begin traversing the new path.
NOTE: This option is required if you are using the HAFM appliance.
Domain RSCNs
Domain register for state change notifications (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. Note that this option is required if Enterprise Fabric Mode (optional SANtegrity
binding feature) is enabled.
Suppress RSCNs on zone set activations
Fabric format domain register for state change notifications (RSCNs) are sent to ports on the switch
following any change to the fabric's active zone set. These changes include activating and
deactivating the zone set, or enabling and disabling the default zone. When the Suppress RSCNs
on Zone Set Activations check box is selected, fabric format RSCNs are not sent for zone changes to
the attached devices on the switch. Click the check box to remove or add a checkmark.
This option is enabled (check box not selected) by default. In most cases this option should be
enabled so that attached devices can receive notification of zoning changes in the fabric. However,
some HBAs may log out, then log back into the fabric when they receive an RSCN, thereby
disrupting Fibre Channel traffic. Consult with your HBA and storage device vendor to determine if
disabling this option (and thereby enabling RSCN transmission) will cause problems with your HBA
or storage products.
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