Vlans allowed on trunk - none - BETWEEN 2X 9500

[sambobbi]

Interface config of 9500 is below -
BN2#show int po12 trunk
port    mode  Encapsulation  status    native Vlan
po12   ON     802.1Q             other    999
port    Vlans Allowed on trunk
12       none
port    vlans allowed and active in management domain
po12  none

port    vlans in Spanning tree forwarding state and not pruned
po 12   none
interface TwentyFiveGig1/0/1
description Connects to IM1 TwentyFiveGig1/1/5-6
switchport trunk native vlan 999
switchport trunk allowed vlan 13
switchport mode trunk
channel-group 13 mode active

interface TwentyFiveGig 1/0/2
description IM1 TwentyFiveGig1/1/5-6
description to Connects to IM1 TwentyFiveGig1/1/5-6
switchport trunk native vlan 999
switchport trunk allowed vlan 13
switchport mode trunk
channel-group 13 mode active

interface TwentyFiveGig1/0/3
description Connects to BN2 TwentyFiveGig1/1/1-2
switchport trunk native vlan 999
switchport trunk allowed vlan 12
switchport mode trunk
channel-group 12 mode active

interface TwentyFiveGig 1/0/4
description to Connects to BN2 TwentyFiveGig1/1/1-2
switchport trunk native vlan 999
switchport trunk allowed vlan 12
switchport mode trunk
channel-group 12 mode active

interface TwentyFiveGig 1/0/5
description to Connects to IM2 TwentyFiveGig1/1/5-6
switchport trunk native vlan 999
switchport trunk allowed vlan 14
switchport mode trunk
channel-group 14 mode active

interface TwentyFiveGig 1/0/6
description to Connects to IM2 TwentyFiveGig1/5-6
switchport trunk native vlan 999
switchport trunk allowed vlan 14
switchport mode trunk
channel-group 14 mode active

interface port-channel 13
switchport trunk native vlan 999
switchport trunk allowed vlan 13
switchport mode trunk

interface port-channel 12
switchport trunk native vlan 999
switchport trunk allowed vlan 12
switchport mode trunk

interface port-channel 14
switchport trunk native vlan 999
switchport trunk allowed vlan 14
switchport mode trunk

interface vlan 13
Ip address 192.168.101.1 255.255.255.252

interface vlan 12
Ip address 192.168.100.1 255.255.255.252

interface vlan 14
Ip address 192.168.102.1 255.255.255.252

network 192.168.101.0 0.0.0.3 area 0
network 192.168.100.0 0.0.0.3 area 0
network 192.168.102.0 0.0.0.3 area 0

[marce1000 · Accepted solution]

 - Review this remark : https://community.cisco.com/t5/switching/port-channel-trunk-not-showing-allowed-vlans-c9407/m-p/3835699#M463487

 M.

[MHM Cisco World]

can you share the 
show etherchannel summary 

[fharris]

I would be curious to see the output of "show vlan" to see if the VLANs you are referencing exist in the VLAN database.  Just creating the VLAN interfaces do not add them to the database, and if they aren't in the database, it would prevent those VLANs from being allowed over the trunk.

"Show IP interface brief" would also be useful to see if the links of those VLANs are up or not.  Creating the VLAN by entering "vlan 12" from global config mode might bring the link up if it is currently down.