HP 8/40 Brocade Fabric OS Administrator's Guide v6.3.0 (53-1001336-01, July 20 - Page 438
FSPF routing rules and traffic isolation, Additional considerations when disabling failover
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18 Traffic Isolation Routing Additional considerations when disabling failover If failover is disabled, be aware of the following considerations: • This feature is intended for use in simple linear fabric configurations, such as that shown in Figure 49 on page 394. • Ensure that there are non-dedicated paths through the fabric for all devices that are not in a TI zone. • If you create a TI zone with just E_Ports, failover must be enabled. If failover is disabled, the specified ISLs will not be able to route any traffic. • If the path between devices in a TI zone is broken, no inter-switch RSCNs are generated. Each switch that is part of the TI zone generates RSCNs to locally attached devices that are part of the TI zone and are registered to receive RSCNs. • Ensure that there are multiple paths between switches. Disabling failover locks the specified route so that only TI zone traffic can use it. Non-TI zone traffic, including domain controller frames, are excluded from using the dedicated path. For example, in Figure 50, if failover is disabled, Domain 2 cannot send domain controller frames to Domain 3 and 4. Domain controller frames include zone updates and Name Server queries. To avoid this problem, add a second, non-dedicated ISL between Domain 1 and 3. Domain 1 Domain 3 8 1 9 3 9 12 15 7 = Dedicated Path 6 = Ports in the TI zone 5 Domain 2 Domain 4 FIGURE 50 Fabric incorrectly configured for TI zone with failover disabled • It is recommended that TI zone definitions and regular zone definitions match. In Figure 50, if failover is disabled, the initiator and target on Domain 1 lose connectivity, even if they are in the same regular zone. To maintain local connectivity between these devices, either enable failover or add N_Port "1,9" to the TI zone. • It is recommended that the insistent Domain ID feature be enabled; if a switch changes its active domain ID, the route is broken. See the configure command in the Fabric OS Command Reference for information about setting insistent Domain ID. FSPF routing rules and traffic isolation All traffic must use the lowest cost path. FSPF routing rules take precedence over the TI zones, as described in the following situations. 396 Fabric OS Administrator's Guide 53-1001336-01
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