Brocade Access Gateway Administrator's Guide Supporting Fabric OS v7.0.0 (53-1002156-01, April 2011)

Access Gateway Administrator’s Guide 61
53-1002156-01
Adaptive Networking on Access Gateway
3
FIGURE 12 Starting point for QoS
Upgrade and downgrade considerations for Adaptive Networking in AG
mode
Downgrading to Fabric OS v6.4.0 from Fabric OS 7.0.0 is supported. Note the following
considerations when upgrading to Fabric OS v7.0.0 from Fabric OS v6.2.X and earlier and
downgrading from Fabric OS v7.0.0 to Fabric OS v6.2.X and earlier:
• If any of the AG QoS-enabled ports are active and you attempt a firmware downgrade, the
downgrade is prevented. You must disable the QoS-enabled ports before performing a
firmware downgrade.
• Upgrades from earlier versions to Fabric OS v7.0.0 are allowed, but AG QoS-enabled ports do
not become effective until the ports are disabled or enabled so that QoS mode can be
negotiated on the ISLs.
Adaptive Networking on Access Gateway considerations
• QoS is configured in the fabric, as normal, and not on the AG module. To extend QoS benefits
to AG and devices behind it, you only need to ensure that the AN and/or SAO licenses are
applied and enabled on the AG module.
• QoS on Access Gateway is only supported on Fabric OS v6.3 and later.
• You should disable HBA QoS if connected to a Fabric OS v6.2 AG switch.
• Disable QoS on an AG port if it connects with a switch running Fabric OS v6.2. Otherwise, the
port will automatically disable with an error. To recover, disable QoS on the port, and then
enable the port.
• Disabling QoS on online N_Ports in the same trunk can cause the slave N_Port ID Virtualization
(NPIV) F_Port on the Edge switch to become persistently disabled with “Area has been
acquired.” This is expected behavior because after QoS is disabled, the slave NPIV F_Port on
the Edge switch also tries to come up as a master. To avoid this issue, simply persistently
enable the slave F_Port on the switch.
• QoS takes precedence over ingress rate limiting