I’ve got a Cisco CISCO2901/K9 router which I’m wanting to configure the GI0/3/3 port to a trunking port and only allow vlan 1101 over the trunk.
The switchport is configured as a trunking port and is working fine. However when I use the command switchport trunk allowed vlan add 1101 it looks like it accepts it, but then doesn’t show up in the show interfaces trunk.
switchport mode trunk
no ip address
ROUTER#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Gi0/0/0 on 802.1q trunking 1
Gi0/3/3 on 802.1q trunking 1
Port Vlans allowed on trunk
Port Vlans allowed and active in management domain
Port Vlans in spanning tree forwarding state and not pruned