Dell Brocade G620 Brocade 8.0.1 Fabric OS Command Reference - Page 208

dlsSet Notes For example, assume a chassis is partitioned as follows: logical switch LS1 consists of ports 1/0-1/5, and logical switch LS2 consists of ports 1/6-1/10. Lossless is enabled on logical switch LS1. Because the ports 1/0-1/10 share the same chip, traffic in LS2 is affected whenever traffic for LS1 on ports 1/0-1/5 is rebalanced. The impact on LS2 depends on the configuration on LS2: • If the Lossless feature is enabled on LS1, traffic pauses and resumes without frame loss on both switches at the same time. • If the Lossless feature is disabled on LS1, traffic on LS2 is not affected. For switches running Fabric OS v7.1.0 or later, you can enable Lossless (or enable Fabric Management Server mode) when XISL is enabled and enable XISL when Lossless or Fabric Management Server mode is enabled. When you downgrade from Fabric OS v7.1.x to Fabric OS v7.0.x the following rules apply: If Lossless (or Fabric Management Server mode) and XISL use are not enabled at the same time, firmware download can be executed. If both of them are enabled, firmware download is rejected with an error message. If the active control processor (CP) runs Fabric OS v7.1.x or later, and the standby CP runs Fabric OS v7.0.x and if both Lossless (or Fabric Management Server mode) and XISLs are enabled, High Availability synchronization will fail. Otherwise, standby CP will synchronize with the active CP. After the synchronization of the active and standby CP, enabling Lossless (or Fabric Management Server mode), when XISL is enabled, is rejected with an error message. Enabling XISL, when Lossless (or Fabric Management Server mode) is enabled, is also rejected with an error message. Use the configure command to disable XISL use. Lossless is supported with both exchange-based and port-based routing policies. Behavior depends on the kind of policy configured and concurrent IOD settings. Refer to the Fabric OS Administrator's Guide for information on how to optimize your configuration. Refer to the aptPolicy help page for more information on routing policies. The Lossless feature is not supported on GbE ports and FCoE. On unsupported platforms, this command exits with an appropriate message. When the E_Port Balance Priority feature status is changed using --enable -eportbal or --disable -eportbal, the status of the DLS and Lossless features remains unchanged. The E_Port Balance Priority feature is supported only on multi-ASIC platforms like Brocade 6520, DCX 8510-8, and DCX 8510-4. Two-hop Lossless DLS is not supported over LISLs. The execution of this command is subject to Virtual Fabric restrictions that may be in place. Refer to "Using Fabric OS Commands" and "Command Availability" for details. Operands --enable -lossless Enables the Lossless feature. Frame loss is reduced while the path is rerouted. If DLS is set on the switch, this command adds the Lossless feature to the existing DLS legacy mode. If DLS is not set on the switch, this command enables both DLS and the Lossless feature. The Lossless feature is disabled by default. --disable -lossless Disables the previously enabled Lossless feature. Execution of this command is equivalent to the legacy dlsSet command. Dynamic load balancing is enforced but not without frame loss. DLS (legacy mode) continues to be enabled after Lossless is disabled. Use dlsReset to disable DLS completely. 184 Brocade Fabric OS Command Reference 53-1004112-02