Brocade Communications Systems 53-1001763-02 - page 311

Fabric OS Administrator’s Guide 271
53-1001763-02
Traffic Isolation Zoning overview 12
•If failover is disabled, non-TI zone traffic is blocked because it cannot use the dedicated ISL,
which is the lowest cost path.
For example, in Figure 36, there is a dedicated path between Domain 1 and Domain 3, and
another, non-dedicated, path that passes through Domain 2. If failover is enabled, all traffic will use
the dedicated path, because the non-dedicated path is not the shortest path. If failover is disabled,
non-TI zone traffic is blocked because the non-dedicated path is not the shortest path.
FIGURE 36 Dedicated path is the only shortest path
In Figure 37 on page 271, a dedicated path between Domain 1 and Domain 4 exists, but is not the
shortest path. In this situation, if failover is enabled, the TI zone traffic uses the shortest path, even
though the E_Ports are not in the TI zone. If failover is disabled, the TI zone traffic stops until the
dedicated path is configured to be the shortest path.
FIGURE 37 Dedicated path is not the shortest path
NOTE
For information about setting or displaying the FSPF cost of a path, see the linkCost and
topologyShow commands in the Fabric OS Command Reference.
7
12
3
14
15
16
Domain 1 Domain 3
Domain 4
Domain 2
819
6
9
5
= Dedicated Path
= Ports in the TI zone
7
12
3
14
15
16
Domain 1 Domain 3
Domain 4
Domain 2
819
6
9
5
= Dedicated Path
= Ports in the TI zone