270 Fabric OS Administrator’s Guide
53-1001763-02
Traffic Isolation Zoning overview
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•For the Brocade 300, 5000, 5100, 5300, 5410, 5424, 5450, 5460, 5470, 5480, 7800, 8000,
VA-40FC, DCX, DCX-4S, and Brocade Encryption Switch: Domain controller frames can use any
path between switches. Disabling failover does not affect Domain Controller connectivity.
For example, in Figure 35, if failover is disabled, Domain 2 can continue to send domain
controller frames to Domain 3 and 4, even though the path between Domain 1 and Domain 3
is a dedicated path. Domain controller frames include zone updates and Name Server queries.
FIGURE 35 Fabric incorrectly configured for TI zone with failover disabled
•For the Brocade 4100, 4900, 7500, 7500E, 7600, and 48000: Non-TI zone traffic, including
domain controller frames, are excluded from using the dedicated path.
For example, in Figure 35, 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.
•Disabling failover does not affect local connectivity.
For example, in Figure 35, the initiator and target on Domain 1 are not in the same TI zone. If
failover is disabled, the initiator and target on Domain 1 maintain connectivity, as long as they
are in the same regular 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.
If the dedicated ISL is not the lowest cost path ISL, then the following rules apply:
•If failover is enabled, the traffic path for the TI zone is broken, and TI zone traffic uses the
lowest cost path instead.
•If failover is disabled, the TI zone traffic is blocked.
If the dedicated ISL is the only lowest cost path ISL, then the following rules apply:
•If failover is enabled, non-TI zone traffic as well as TI zone traffic uses the dedicated ISL.
7
12
3
15
Domain 1 Domain 3
Domain 4
Domain 2
819
6
9
5
= Dedicated Path
= Ports in the TI zone