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WCL2112 not reachable when plugged into a trunk port?

I have a Cisco Wireless LAN Controller WCL2112 model. It's currently plugged into an HP Procurve switch on a trunk port. That HP switch is plugged into my Cisco stack on a trunk port. I can reach the WCL just fine through the LAN. But when I plug the WCL directly into the Cisco stack on a trunk port(removing the HP switch), I can't reach the WCL at all, unless I connect to it over wireless. The interface shows it's conneccted and up/up. But no communications are sent across the line. I did a wireshark and can see only ARP request from the WCL.

The trunk port on the stack is set to:

interface GigabitEthernet1/0/1

switchport trunk encapsulation dot1q

switchport mode trunk

CiscoStack1#show interfaces GigabitEthernet 1/0/1 switchport
Name: Gi1/0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
CiscoStack1#

The WCL has 3 VLAN's on it and the SSID of VLAN 1 is our office wireless. VLAN's 1, 3, & 4.

The Cisco Stack is 4 switches. cisco WS-C3750X-48P

This is the first time I've dealt with a wireless lan controller, so it's new to me. I'm reading the docs and it sounds like I need to change the switch port to add the line "switchport trunk allowed vlan add 1,3,4" ? Is that the cause of my problems? I'm trying to get rid of the HP switch and plug the wireless controller directly into my cisco stack.

Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions

Re: WCL2112 not reachable when plugged into a trunk port?

Yes that is what I was looking for. You are tagging the management interface.

What's, should be, happening is the switch is dropping the traffic, dot1q trunks drop traffic if it sees the native VLAN tagged in a packet.

Try this on the port the WLC is connected to

Switchport trunk native VLAN 999

Steve

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HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
7 REPLIES

Re: WCL2112 not reachable when plugged into a trunk port?

Is VLAN 1 your management interface? Are you tagging the management in the WLC?

Of you can get to the CLI can you lost the output from show interface summary?

Steve

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HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

Re: WCL2112 not reachable when plugged into a trunk port?

VLAN 1 is my management interface. I don't know how to tell if the tagging it on the management in the WLC?

(Cisco Controller) >show interface summary

Interface Name                   Port Vlan Id  IP Address      Type    Ap Mgr Guest
-------------------------------- ---- -------- --------------- ------- ------ -----
ap-manager                            1    1        192.168.10.166  Static  Yes    No
management                          1    1        192.168.10.165  Static  No     No
shop                                      1    3        192.168.20.151  Dynamic No     No
vendor                                    1    4        192.168.30.2     Dynamic No     No
virtual                                    N/A  N/A      1.1.1.1           Static  No     No

Is that what you wanted?

Re: WCL2112 not reachable when plugged into a trunk port?

Yes that is what I was looking for. You are tagging the management interface.

What's, should be, happening is the switch is dropping the traffic, dot1q trunks drop traffic if it sees the native VLAN tagged in a packet.

Try this on the port the WLC is connected to

Switchport trunk native VLAN 999

Steve

Sent from Cisco Technical Support iPhone App

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

Re: WCL2112 not reachable when plugged into a trunk port?

Thanks! I'll try that in a couple hours and report back.

New Member

Re: WCL2112 not reachable when plugged into a trunk port?

Or would it be better to untag the management interface?

Re: WCL2112 not reachable when plugged into a trunk port?

No you want all interfaces tagged.

Steve

Sent from Cisco Technical Support iPhone App

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

Re: WCL2112 not reachable when plugged into a trunk port?

That was it! Thanks Steve. Put the native VLAN to 999 and am able to connect just fine now.

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