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4 – Managing Switches
Configuring a Switch
59022-03 D 4-9
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-24 for 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.
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.
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.