Hi Sarah,

Even if you add it manually, it will not show up

Here vlan 90 is pruned manually but it does not show up when I do "do sh int fa0/29 trunk"

Management-Switch(config-if)#do sh int fa0/29 trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa0/29      on           802.1q         trunking      1

Port      Vlans allowed on trunk
Fa0/29      100

Port        Vlans allowed and active in management domain
Fa0/29      100

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/29      100
Management-Switch(config-if)#

Management-Switch(config-if)#do sh run int fa0/29 
Building configuration...

Current configuration : 186 bytes
!
interface FastEthernet0/29
description connection-to-cisco-2611-router
switchport trunk allowed vlan 100
switchport trunk pruning vlan 90
switchport mode trunk
no ip address
end

HTH

Reza

Hi every body
I
was reading my book. The book says  when this command, " show int f0/1
trunk" is issued, the last line of output,"active not pruned"  shows
the list which is subset of " allowed and active"  list  with any vtp
pruned vlans removed.
So 
vlans which are being pruned would not be listed under this line"
active and not pruned"    . How about if  i manually configure pruning
on trunk as:
switchport  trunk pruning vlan 2 .  will vlan2 be listed or not listed under " active and  not pruned list"  ?
thanks and have a good  day.

Hi Sarah,

As per the documents you are right it only shows the not pruned vlans on the output,if you manually prune a vlan it will not show that vlan in the output.

Another command to check the pruning vlan on unnder interface

Switch#show interfaces fastEthernet 0/1 switchport 

http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=6

Hope to Help !!

Ganesh.H