Cisco MDS 9000 Series Configuration Manual page 222

Trunk-Allowed VSAN Lists and VF_IDs
Figure 6: Default Allowed-Active VSAN Configuration
You can configure a select set of VSANs (from the allowed-active list) to control access to the VSANs specified
in a trunking ISL.
Using Figure 6: Default Allowed-Active VSAN Configuration, on page 204
the list of allowed VSANs on a per-interface basis (see
on page 204). For example, if VSANs 2 and 4 are removed from the allowed VSAN list of ISLs connecting
to switch 1, the operational allowed list of VSANs for each ISL would be as follows:
• The ISL between switch 1 and switch 2 includes VSAN 1 and VSAN 3.
• The ISL between switch 2 and switch 3 includes VSAN 1 and VSAN 2.
• The ISL between switch 3 and switch 1 includes VSAN 1, 2, and 5.
Consequently, VSAN 2 can only be routed from switch 1 through switch 3 to switch 2.
Figure 7: Operational and Allowed VSAN Configuration
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
204
as an example, you can configure
Figure 7: Operational and Allowed VSAN Configuration,
Configuring Trunking