Brocade Fabric OS Administrator's Guide Supporting Fabric OS v6.3.0 (53-1001336-02, November 2009)

430 Fabric OS Administrator’s Guide
53-1001336-02
QoS: SID/DID traffic prioritization
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FIGURE 66 Traffic prioritization in a logical fabric
High availability considerations for traffic prioritization
If the standby CP is running a Fabric OS version earlier than 6.3.0 and is synchronized with the
active CP, then QoS zones using D,I notation cannot be created. If the standby CP is not
synchronized or if no standby CP exists, then the QoS zone creation succeeds.
If QoS zones using D,I notation exist in either the defined or active configuration and the standby
CP tries to synchronize with the active CP, the synchronization fails if the standby CP is running a
Fabric OS version earlier than 6.3.0. Synchronization can succeed only if the QoS D,I zones are
removed.
Supported configurations for traffic prioritization
Note the following configuration rules for traffic prioritization:
• All switches in the fabric must be running Fabric OS v6.0.0 or later.
ATTENTION
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 one of the
following:
• Brocade 300
• Brocade 5100
• Brocade 5300
• Brocade 5410
• Brocade 5424
= 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