Brocade Network Advisor SAN User Manual v11.1x (53-1002167-01, May 2011)

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QoS SID/DID priorities over an FCIP trunk
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• 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 639. 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.
FIGURE 285 TCP connections for handling QoS SID/DID-based FC traffic prioritization
Virtual
Tunnel
Tunnel
VE Port Internal Architecture
External User Perspective
Circuit
GE Port
High Priority Med. Priority Low Priority F-Class
Virtual
Tunnel
Virtual
Tunnel
Virtual
Tunnel
Virtual
Circuit
Virtual
Circuit
Virtual
Circuit
Virtual
Circuit
TCP
Connection
IP
Interface
TCP
Connection
TCP
Connection
TCP
Connection