HP Fabric OS 7.1.0, Administrator'S Manual

Page: 349 / 666

Fabric OS Administrator’s Guide 349
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Traffic Isolation Zoning overview
12
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.
•
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 33 , 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 33 Dedicated path is the only shortest path
In Figure 34 on page 350, 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.
7
12
3
14
15
16
Domain 1 Domain 3
Domain 4 Domain 2
8
1 9
6
9
5
= Dedicated Path
= Ports in the TI zone