Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 312
High availability considerations with broadcast zones, Loop devices and broadcast zones
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11 Zone aliases High availability considerations with broadcast zones If a switch has broadcast zone-capable firmware on the active CP (Fabric OS v5.3.x or later) and broadcast zone-incapable firmware on the standby CP (Fabric OS version earlier than v5.3.0), then you cannot create a broadcast zone because the zoning behavior would not be the same across an HA failover. If the switch failed over, then the broadcast zone would lose its special significance and would be treated as a regular zone. Loop devices and broadcast zones Delivery of broadcast packets to individual devices in a loop is not controlled by the switch. Consequently, adding loop devices to a broadcast zone does not have any effect. If a loop device is part of a broadcast zone, then all devices in that loop receive broadcast packets. Best practice: All devices in a single loop should have uniform broadcast capability. If all the devices in the loop can handle broadcast frames, then add the FL_Port to the broadcast zone. Broadcast zones and default zoning mode The default zoning mode defines the device accessibility behavior if zoning is not implemented or if there is no effective zone configuration. The default zoning mode has two options: • All Access-All devices within the fabric can communicate with all other devices. • No Access-Devices in the fabric cannot access any other device in the fabric. If a broadcast zone is active, even if it is the only zone in the effective configuration, the default zone setting is not in effect. If the effective configuration has only a broadcast zone, then the configuration appears as a No Access configuration. To change this configuration to All Access, you must put all the available devices in a regular zone. See "Default zoning mode" on page 326 for additional information about default zoning. Zone aliases A zone alias is a logical group of ports or WWNs. You can simplify the process of creating zones by first specifying aliases, which eliminates the need for long lists of individual zone member names. If you are creating a new alias using aliCreate w, "1,1", and a user in another Telnet session executes cfgEnable (or cfgDisable, or cfgSave), the other user's transaction will abort your transaction and you will receive an error message. Creating a new alias while there is a zone merge taking place might also abort your transaction. For more details about zone merging and zone merge conflicts, see "Zone merging" on page 336. Virtual Fabrics considerations: Alias definitions should not include logical port numbers. Zoning is not enforced on logical ports. 312 Fabric OS Administrator's Guide 53-1002745-02
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