Brocade Network Advisor SAN User Manual v12.0.0 (53-1002696-01, April 2013)

766 Brocade Network Advisor SAN User Manual

53-1002696-01

QoS SID/DID priorities over an FCIP trunk

QoS SID/DID traffic prioritization is a capability of Fabric OS Adaptive Networking licensed feature.

This feature allows you to prioritize FC traffic flows between hosts and targets.

Four internal TCP connections provide internal circuits for managing QoS SID/DID priorities over an

FCIP tunnel, as illustrated in Figure 344. The priorities are as follows:

• F class - F class is the highest priority, and is assigned bandwidth as needed at the expense of

lower priorities, if necessary.

• QoS high - The QoS high priority gets at least 50% of the available bandwidth.

• QoS medium - The QoS medium priority gets at least 30% of the available bandwidth.

• QoS low - The QoS low priority gets at least 20% of the available bandwidth.

NOTE

The QoS high (50%), medium (30%), and low (20%) values are fixed for the 4 Gbps Extension Blade

and cannot be configured. For 8 Gbps platforms, these are default values which you can change

using procedures under “Configuring QoS Priorities” on page 767. These priorities are enforced only

when there is congestion on the network. If there is no congestion, all traffic is handled at the same

priority.