Qos sid/did priorities over an fcip trunk – Brocade Network Advisor SAN User Manual v12.1.0 User Manual
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Brocade Network Advisor SAN User Manual
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QoS SID/DID priorities over an FCIP trunk
22
•
If the bandwidth is greater than or equal to 2 Gbps, the link cost is 500.
•
If the bandwidth is less than 2 Gbps, but greater than or equal to 1 Gbps, the link cost is
1000000 divided by the bandwidth.
•
If the bandwidth is less than 1 Gbps, the link cost is 2000 minus the bandwidth
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
Figure 357
. 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 default values which you can change
using procedures under
on page 819. 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.