VLAN line protocol is down

[henderson.john]

Hi and thanks in advance,

I have a 2960XR that will act as a layer 3 router for multiple VLAN's. The 2960 XR has an EtherChannel to another switch that has the VLAN's with the physical devices connected.

I don't have any physical ports on the 2960XR that need the VLAN's they are staying in an up/down state. I have tried adding the VLAN access to the "Port-Channel" but it still shows in a down state.

What should I do in this scenario to allow the 2960XR to bring up the VLAN's and allow routing of the traffic.

[willwetherman]

Hi,

Can you post a copy of the switch config and the output of 'show etherchannel summary' and 'show spanning-tree vlan x'

Thanks

[Richard Burts]

I am not clear in the original post whether the problem is with the layer 2 vlan or is with the layer 3 vlan interface. I am guessing that the problem is the layer 3 vlan interface. There are two things either of which should bring the vlan interface to an up/up state. Either connect a physical device into an access port of the vlan or else allow that vlan in an active trunk on that switch.

To help us better understand the issue please post the output of the commands on the 2960

show ip interface brief

show interface trunk

HTH

Rick

[henderson.john]

The problem is with the Layer 3 VLAN interfaces not coming up as there isn't a physical port associated.

You note that I can allow the VLAN on an active trunk. Do you mind sharing the config this should reflect to compare.

Unfortunately I don't have access to the device until early next week to provide the output and the current config.

... from memory the config of the important parts is similar to this

hostname Switch
!
ip routing
!
boot-start-marker
boot-end-marker
!
!
interface GigabitEthernet1/0/1
 channel-group 1
!
interface GigabitEthernet1/0/2
 channel-group 1
!
interface Vlan1
 ip address 192.168.1.1 255.255.255.0
!
interface Vlan2
 ip address 192.168.2.1 255.255.255.0
!
interface Vlan3
 ip address 192.168.3.1 255.255.255.0
!

ip route 0.0.0.0 0.0.0.0 192.168.1.254

I believe the issue is with the port-channel setup not sure if this is enough to help me get  VLAN 2 & 3 to be active.

Appreciate the help.

[willwetherman]

Hi,

I can see that you have made interfaces Gig1/0/1 and Gig1/0/2 members of port-channel 1 but you have not configured the logical port-channel 1 interface. 

Please try and add the following to your configuration

interface port-channel 1
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport trunk allowed vlan 2,3

Hope this helps