Brocade Communications Systems 53-1002163-02 manual FCoE queuing

1 FCoE queuing

NOTE

When transmitting an RSCN, zoning rules still apply for FCoE devices as the devices are treated as regular FC N_ports.

•VF_port RSCN—An RSCN is generated to all registered members when a VF_port goes online or offline, causing ENode or FC devices to be added or removed.

•Domain RSCN—An RSCN is generated to all registered and affected members when an FC switch port goes online or offline, causing ENode or FC devices to be added or removed. An RSCN is generated when two FC switches merge or segment, causing ENode or FC devices to be added or removed. When FC switches merge or segment, an RSCN is propagated to ENodes.

•Zoning RSCN—An RSCN is generated to all registered and affected members when a zoning exchange occurs in the FC fabric.

FCoE queuing

The QOS configuration controls the FCoE traffic distribution. Note that changing these settings requires changes on both the Brocade FCoE hardware and the CNA; therefore, the link must be taken offline and back online after a change is made. Traffic scheduler configuration changes affect FCoE traffic distribution as follows:

•Changing the priority group for a port causes the FCoE traffic distribution to update. The priority group and bandwidth are updated.

•Changing the priority table for a port causes the FCoE traffic distribution to be updated. The COS-to-priority group mapping is updated.

•Changing the class map for a port causes the FCoE traffic distribution to be updated.

•Changing the policy map for a port causes FCoE traffic distribution to be updated.

•Changing the CEE map for a port causes the FCoE traffic distribution to be updated.

•The FCMAP to VLAN mapping determines the FCoE VLAN allowed for the FCoE session. Modifying this mapping causes the existing sessions to terminate.

NOTE

Only one FCoE VLAN is supported in the Fabric OS v7.0.0 release.

Upgrade and downgrade considerations for FCoE

Firmware upgrades from Fabric OS v6.3.x or v6.4.0 to Fabric OS v7.0.0 are disruptive for FCoE traffic. When you upgrade, FCoE provisioning creates the default FCoE VLAN 1002 and the default CEE map with priority 3 with PFC enabled for FCoE traffic. No DCE ports are allowed to carry FCoE traffic by default. You are expected to enable FCoE on a DCE port using the fcoeport command. Once this is done, the CNA will login. See “Assigning an FCoE map onto an interface” on page 36.

Firmware downgrades from Fabric OS v7.0.0 to Fabric OS v6.3.x or v6.4.0 cause all of the FCoE provisioning configurations to be lost. To cause th CNAs to login again, you must recreate the FCoE configurations afresh using the Fabric OS v6.3.x or v6.4.0 CLIs.

12	Converged Enhanced Ethernet Administrator’s Guide
	53-1002163-02