Dell Brocade G620 Brocade 8.0.1 Fabric OS Administratiors Guide - Page 523
HA and downgrade considerations for LSAN zones, LSAN zone policies using LSAN tagging, Enforce tag
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Using FC-FC Routing to Connect Fabrics 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. ∙ 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. ∙ In a Backbone-to-edge routing topology, if the "FCR state" in the switch is disabled and the switch is downgraded to pre-Fabric OS 8.0.1 and then subsequently the "FCR state" is enabled, you must re-enable the zone configuration in the backbone fabric if "lsanzoneshow -s" for the backbone fabric ID is not displayed. 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 Use the Enforce tag to achieve better scalability in the FC router by limiting the number of LSAN zones that are enforced in that FC router. 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. The Enforce tag is useful in the following scenarios: ∙ Multiple FC routers are connected to the same edge fabric. ∙ The backbone fabric contains multiple FC routers with multiple edge fabrics. In these scenarios, often an FC router does not need to know about all edge fabrics and their respective LSAN zones. You can use the Enforce tag to indicate which LSAN zones are imported by which FC routers. Without the Enforce tag, all FC routers import all LSAN zones, even those that are not needed. For example, the following figure shows a metaSAN with three FC routers in the backbone, and each FC router has one edge fabric connected to it. In this scenario, LSAN zones communicate between edge fabric 1 and edge fabric 2, and between edge fabric 2 and edge fabric 3. There is no communication between edge fabric 1 and edge fabric 3. Brocade Fabric OS Administration Guide, 8.0.1 53-1004111-02 523
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