Q-Logic 59022-03 D manual Domain ID, Broadcast Support

￿	4 – Managing Switches
	Configuring a Switch

4.6.1.3

Domain ID

The domain ID is a unique Fibre Channel identifier for the switch. The Fibre Channel address consists of the domain ID, port ID, and the Arbitrated Loop Physical Address (ALPA). The maximum number of switches within a fabric is 239 with each switch having a unique domain ID.

Switches come from the factory with the domain IDs unlocked (DomainID-Lock= FALSE). This means that if there is a domain ID conflict in the fabric, the switch with the highest principal priority, or the principal switch, will reassign any domain ID conflicts and establish the fabric. If you lock the domain ID on a switch (DomainIDLock=TRUE) and a domain ID conflict occurs, the switch with the higher WWN will isolate as a separate fabric and the Logged-In LEDs on both switches will flash to show the affected ports. Refer to the ”Set Config Command” on page A-24for information about the Switch keyword and the DomainIDLock and PrincipalPriority parameters.

If you connect a new switch to an existing fabric with its domain ID unlocked, and a domain conflict occurs, the new switch will isolate as a separate fabric. However, you can remedy this by resetting the new switch or taking it offline then back online. The principal switch will reassign the domain ID and the switch will join the fabric.

Note: Domain ID reassignment is not reflected in zoning that is defined by domain ID and port number pair. You must reconfigure zones that are affected by domain ID reassignment.

4.6.1.4

Broadcast Support

Broadcast is supported on the SANbox2 which allows for IP-over-Fibre Channel support support. Broadcast is implemented using the proposed standard specified in Multi-Switch Broadcast for FC-SW-3, T11 Presentation Number T11/02-031v0. FSPF is used to setup a fabric spanning tree used in transmission of broadcast frames. Broadcast frames are retransmitted on all ISLs indicated in the spanning tree and all online F/FL ports. Broadcast zoning is supported with Access Control List (ACL) and Virtual Private Fabric (VPF) hard zones. When a broadcast frame is received, these hard zones are enforced at the F/FL port. If the originator of the broadcast is in a hard zone, the frame is retransmitted on all online F/FL ports within the hard zone. If the originator of the broadcast frame is not in a hard zone, the frame is retransmitted on online F/FL ports that are not in a hard zone.

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