Vfc and vsan on nexus 5K interface

Hi,
I am seeing the following configuration on one of the 5K interfaces & related subsequent configs follow;
int eth1/2
description test1 vfc-1030
switchport mode trunk
spanning-tree port type edge trunk
spanning-tree bpduguard enable
sh run int vfc 1003
version 5.2(1)N1(3)
interface vfc1030
bind interface Ethernet1/2
switchport trunk allowed vsan 120
switchport description test1
no shutdown
sh vsan 120
vsan 120 information
         name:VSAN-120 state:active
         interoperability mode:default
         loadbalancing:src-id/dst-id/oxid
         operational state:up
Now the vfc1030 interface says only allow vsan 120 over the trunk, whereas eth1/2 switch port status tells me that all vlans(1-4094) are allowed on this interface.
So , how does this work here? which one takes precedence and what vlans actually flow over this.
I am confused by this linkages, appreciate if some one can shed some light on the above please.
Thanks in advance!

What NX-OS version are you using? It is available starting NX-OS 5.1(3)N2(1) on the Nexus 5500:
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/qos/521_n1_1/b_5k_QoS_Config_521N11_chapter_01000.html#topic_93B8067633394356B790D6F1E522CC61
HTH,
jerry

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