Cisco MDS 9000 Series Configuration Manual page 221

Configuring Trunking
The common set of VSANs that are configured and active in the switch are included in the trunk-allowed
VSAN list for an interface, and they are called allowed-active VSANs. The trunking protocol uses the list of
allowed-active VSANs at the two ends of an ISL to determine the list of operational VSANs in which traffic
is allowed.
Switch 1 (see
switch 2 has VSANs 1 through 3, and switch 3 has VSANs 1, 2, 4, and 5 with a default configuration of
trunk-allowed VSANs. All VSANs configured in all three switches are allowed-active. However, only the
common set of allowed-active VSANs at the ends of the ISL become operational (see
Allowed-Active VSAN Configuration, on page
For all F, N, and NP ports, the default VF_ID is 1 when there is no VF_ID configured. The trunk-allowed
VF_ID list on a port is same as the list of trunk-allowed VSANs. VF_ID 4094 is called the control VF_ID
and it is used to define the list of trunk-allowed VF-IDs when trunking is enabled on the link.
If F port trunking and channeling is enabled, or if switchport trunk mode on is configured in NPV mode
for any interface, or if NP PortChannel is configured, the VSAN and VF-ID ranges available for the
configuration are as described in
Table 25: VSAN and VF-ID Reservations
VSAN or VF-ID
000h
001h(1) to EFFh(3839)
F00h(3840) to FEEh(4078)
FEFh(4079)
FF0h(4080) to FFEh(4094)
FFFh
Note If the VF_ID of the F port and the N port do not match, then no tagged frames can be exchanged.
Figure 6: Default Allowed-Active VSAN Configuration, on page
Table 25: VSAN and VF-ID Reservations, on page
Description
Cannot be used as virtual fabric identifier.
This VSAN range is available for user configuration.
Reserved VSANs and they are not available for user configuration.
EVFP isolated VSAN.
Used for vendor-specific VSANs.
Cannot be used as virtual fabric identifier.
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
Trunk-Allowed VSAN Lists and VF_IDs
204).
204) has VSANs 1 through 5,
Figure 6: Default
203.
203