Fabric OS Administrator’s Guide 529
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QoS zones
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FIGURE 70 Traffic prioritization in a logical fabric
Supported configurations for QoS zone-based traffic prioritization
The following configuration rules apply to QoS zone-based traffic prioritization:
• All switches in the fabric must be running Fabric OS v6.0.0 or later.
If QoS traffic crosses an ISL for a switch running a firmware version earlier than Fabric OS
v6.0.0, the frames are dropped.
• By default, all devices are assigned medium priority.
- To be assigned high or low priority, hosts and targets must be connected to a Brocade
8-Gbps or 16-Gbps switch or port blade.
- To preserve the priority level across ISLs, the switches must be running Fabric OS v6.0.0 or
later and must be one of the following platforms: Brocade 300, 4100, 4900, 5000, 5100,
5300, 5410, 5424, 5450, 5480, 6510, 6520, 7500, 7500E, 7600, 7800, 8000,
VA-40FC, 48000, Brocade DCX, DCX-4S, or DCX 8510 family.
• QoS is enabled by default on 8-Gbps and 16-Gbps ports. QoS is disabled by default on all
4-Gbps ports and long-distance ports.
Limitations and restrictions for QoS zone-based traffic prioritization
• Enabling and disabling QoS is potentially disruptive to the I/O on the affected port.
• If a host and target are included in two or more QoS zones with different priorities, the zone
with the lowest priority takes precedence. For example, if an effective zone configuration has
QOSH_z1 (H,T) and QOSL_z2 (H,T), the traffic flow between H and T will be of low QoS priority.
Additionally, if QOSH_z1 (H,T) overlaps with a “domain,port” zone at the H port, the traffic flow
between H and T is dropped to medium priority and the H port is marked as a session-based
zoning port.
= High priority
Chassis 1 Chassis 2
H1
S1
Domain 1
Domain 2
Base switch
Domain 9
LS2, FID3
Domain 6
LS1, FID1
Domain 5
Base switch
Domain 10
LS4, FID3
Domain 8
LS3, FID1
Domain 7
Domain 3
= E_Ports with QoS enabled
12
1
8
5
3
8
16
14
10
9
11
13
15
17
7
6
4
2
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