HP StorageWorks 8/8 Brocade Fabric OS Administrator's Guide v6.3.0 (53-1001336 - Page 109
Frame Redirection
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Frame Redirection 4 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. FIGURE 6 Single Host and Target Figure 6 demonstrates the flow of frame redirection traffic. A frame starts at the host with a destination to the target. The port where the appliance is attached to the host switch acts as the virtual initiator and the port where the appliance is attached to the target switch is the virtual target. Fabric OS Administrator's Guide 67 53-1001336-01
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