Brocade Communications Systems Network Advisor 12.0.0, Руководство пользователя

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766 Brocade Network Advisor SAN User Manual
53-1002696-01
QoS SID/DID priorities over an FCIP trunk
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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.