HP StorageWorks XPath OS 7.4.X Administrator Guide (AA-RVHDD-TE, February 2006)

50 Using the FC-FC Routing Service
On the MP Router, the host and Target A are imported, because both are defined by
lsan_zone_fabric1 and lsan_zone_fabric2. However, Target B, which is defined by
lsan_zone_fabric2, is not imported because lsan_zone_fabric1 does not allow Target B to
be imported.
When a PLOGI, PDISC or ADISC arrives at the MP Router, the SID and DID of the frame are checked. If
they are LSAN-zoned at both SID and DID edge fabrics, the frame is forwarded to the DID. If they are not
zoned, the unauthorized frames are dropped.
Fibre Channel NAT and phantom domains
Within an edge fabric (or across a backbone fabric), the standard Fibre Channel FSPF protocol determines
how frames are routed from the host or target node through the fabric to the destination node. When
frames leave the fabric through an MP Router, the frames are routed to an EX_Port. Fibre Channel fabrics
require that all ports be identified by a unique PID. Within a single fabric, fabric formation guarantees that
domain IDs are unique, and so a PID formed by a domain ID and area number is unique within a fabric.
However, the domain IDs and PIDs in one fabric might be duplicated within another fabric, just as IP
addresses unique to one private network are likely to be duplicated within another private network.
In an IP network, a network router can maintain network address translation (NAT) tables to replace private
network addresses with public addresses when a packet is routed out of the private network, and to
replace public addresses with private addresses when a packet is routed from the public network to the
private network. The Fibre Channel routing equivalent to this IP network address translation is Fibre
Channel network address translation (FC-NAT). Using FC-NAT, the proxy devices in a fabric can have
different PIDs than the real devices that they represent, allowing the proxy devices to have appropriate PIDs
for the address space of their corresponding fabric.
router:admin> lsanzoneshow -s
Fabric ID: 1 Zone Name: lsan_zone_fabric1
10:00:00:00:c9:2b:6a:2c Exist
22:00:00:20:37:c3:11:71 Imported
Fabric ID: 2 Zone Name: lsan_zone_fabric2
10:00:00:00:c9:2b:6a:2c Imported
22:00:00:20:37:c3:11:71 Exist
22:00:00:20:37:c3:1a:8a Exist
router:admin> fcrphydevshow
Device WWN Physical
Exists PID
in Fabric
-----------------------------------------
1 10:00:00:00:c9:2b:6a:2c 030000
2 22:00:00:20:37:c3:11:71 6100e8
2 22:00:00:20:37:c3:1a:8a 6100ef
router:admin> fcrproxydevshow
Proxy WWN Proxy Device Physical State
Created PID Exists PID
in Fabric in Fabric
----------------------------------------------------------------------------
1 22:00:00:20:37:c3:11:71 02f001 2 6100e8 Imported
2 10:00:00:00:c9:2b:6a:2c 01f001 1 030000 Imported