Brocade Fabric OS Administrator's Guide Supporting Fabric OS v6.3.0 (53-1001336-02, November 2009)

Fabric OS Administrator’s Guide 67
53-1001336-02
Frame Redirection
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1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the appropriate iodSet command to enable or disable dynamic load sharing.
switch:admin>iodset --enable lossLessDLS
switch:admin>iodset --disable lossLessDLS
Lossless dynamic load sharing in Virtual Fabrics
Enabling load sharing is optional on logical switches in a Virtual Fabric. If you enable this feature, it
must be on a per logical switch basis and can affect other logical switches in the fabric.
Example of how DLS affects other logical switches in the fabric
On a Brocade DCX platform, logical switch 1 consists of ports 0 through 5 in slot 1. Logical switch 2
consists of ports 6–10 in slot 1. The lossless DLS feature is turned ON on logical switch 1. Because
ports 0–10 in slot 1 belong to a logical switch where lossless DLS is turned on, the traffic in logical
switch 2 is affected whenever traffic for logical switch 1 is rebalanced.
ATTENTION
Although, this feature is enabled for a specific logical switch, you must have chassis-level
permissions to use this feature.
This effect on logical switch 2 is based on the configuration on logical switch 2:
• If logical switch 2 has IOD ON (iodSet only), then IOD is enforced.
• If logical switch 2 has lossless DLS ON, traffic will be paused and resumed.
• If logical switch 2 has no IOD (iodReset), traffic will be paused and resumed.
For more information on Virtual Fabrics and chassis-level permissions, see the “Managing Virtual
Fabrics”chapter.
NOTE
Downgrading from Fabric OS v6.2.0 is not supported if lossless DLS is enabled.
Frame Redirection
Frame Redirection provides a means to redirect traffic flow between a host and a target that use
virtualization and encryption applications, such as SAS and DMM, so that those applications can
perform without having to reconfigure the host and target. You can use this feature if the hosts and
targets are not directly attached.
Frame Redirection depends on the wide distribution of the Defined Zone Database. The Defined
Database on Fabric OS switches is pushed out to all other Fabric OS switches in the fabric that
support Frame Redirection.
Frame Redirection uses a combination of special frame redirection zones and Name Server
changes to spoof the mapping of real device WWNs to Virtual PIDs.