Fabric OS Administrator’s Guide 481
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LSAN zone configuration 21
NOTE
Since the maximum number of LSANs is configured for each switch, if there is a different maximum
LSAN count on the switches throughout the metaSAN, then the device import/export will not be
identical on the FC routers. You should enter the same maximum LSAN count for all the FC routers
in the same backbone that support this feature. Verify the configured maximum limit against the
LSANs configured using the fcrResourceShow command.

Configuring backbone fabrics for interconnectivity

If you want devices in backbone fabrics to communicate with devices in edge fabrics, follow the
steps in the section “Setting up LSAN zone binding” on page 488. However, instead of configuring
the LSAN in the second edge fabric, configure the LSAN in the backbone fabric.

HA and downgrade considerations for LSAN zones

Be aware of how LSAN zones impact high availability and firmware downgrades:
•The LSAN zone matrix is synchronized to the standby CP.
•On a dual CP switch, both CPs must have Fabric OS v5.3.0 or later to enable the feature.
•If the feature is enabled on the active CP, introducing a CP with an earlier version of Fabric OS
as a standby will cause HA synchronization to fail.
•If the feature is enabled, before downgrading to an earlier Fabric OS version, you will be asked
to go back to the default mode.
•This feature does not have any impact on current HA functionality. LSANs will be synchronized
as usual after the limit is increased and new LSANs are created.

LSAN zone policies using LSAN tagging

You can create tags for LSAN zones to give them a special meaning.
LSAN zones are zones with names that start with the “lsan_” prefix. You can specify a tag to
append to this prefix that causes the LSAN zone to be treated differently.
You can specify two types of tags:
•Enforce tag – Specifies which LSANs are to be enforced in an FC router.
•Speed tag – Specifies which LSANs are to be imported or exported faster than other LSANs.
The LSAN tags are persistently saved and support configupload and configdownload.

Enforce tag

The Enforce tag reduces the resources used in an FC router by limiting the number of LSAN zones
that will be enforced in that FC router.
Use the Enforce tag to achieve better scalability in the FC router. This is useful when multiple FC
routers are connected to the same edge fabric. Without the Enforce tag, all FC routers import all
LSAN zones, even those that are not needed.