Cannot add WLC 4404 to WCS after turning on LAG - Device not found

[jtruxton]

Hello, we took one of our controllers and turned LAG on and since then it is unreachable on the WCS. The controller is running version 7.0.116.0 and the WCS is running 7.0.172.0.  I can access teh WLC no problem through web interface and CLI, as I can also do this with the WCS as well, but the WCS cannot access the WLC.

From CLI i can ping the WCS from the Controller and get a response, but from CLI on the WCS, I cannot ping the controller.  Does anyone have any hints?

[Stephen Rodriguez]

Can you share the switchport config from the switch, the show interfaces from teh WLC and teh WCS IP address?

[jtruxton]

I apologize, I should have posted that in the roiginal post...

On the port group on the Catalyst 6506:

interface Port-channel3

switchport

switchport trunk encapsulation dot1q

switchport trunk native vlan 160

switchport mode trunk

On the switch interfaces gi2/21 - 24 on the Catalyst 6506

switchport

channel-group 3 mode on

from the WCS

ifconfig
eth0      Link encap:Ethernet  HWaddr 00:C0:9F:3E:F3:E1
          inet addr:172.31.160.251  Bcast:172.31.160.255  Mask:255.255.255.0
          inet6 addr: fe80::2c0:9fff:fe3e:f3e1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3568683 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1892997 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1315869725 (1.2 GiB)  TX bytes:560183509 (534.2 MiB)
          Interrupt:177

from the WLC

show  port  summary

           STP   Admin   Physical   Physical   Link   Link    Mcast
Pr  Type   Stat   Mode     Mode      Status   Status  Trap   Appliance   POE
-- ------- ---- ------- ---------- ---------- ------ ------- --------- -------
1  Normal  Forw Enable  Auto       1000 Full  Up     Enable  Enable     N/A
2  Normal  Forw Enable  Auto       1000 Full  Up     Enable  Enable     N/A
3  Normal  Forw Enable  Auto       1000 Full  Up     Enable  Enable     N/A
4  Normal  Forw Enable  Auto       1000 Full  Up     Enable  Enable     N/A

Interface Name................................... management

MAC Address...................................... 00:23:5e:8a:e1:6b

IP Address....................................... 172.31.160.246

IP Netmask....................................... 255.255.255.0

IP Gateway....................................... 172.31.160.254

External NAT IP State............................ Disabled

External NAT IP Address.......................... 0.0.0.0

VLAN............................................. untagged

Quarantine-vlan.................................. 0

Active Physical Port............................. LAG (29)

Primary Physical Port............................ LAG (29)

Backup Physical Port............................. Unconfigured

Primary DHCP Server.............................. 172.31.4.190

Secondary DHCP Server............................ Unconfigured

DHCP Option 82................................... Disabled

ACL.............................................. Unconfigured

AP Manager....................................... No

Guest Interface.................................. No

L2 Multicast..................................... Disabled

[George Stefanick]

Any other changes to the network .. ?

[jtruxton]

Not yet, we have 4 controllers that we are going to be putting as a LAG, this is just the first one.

[jtruxton]

Problem solved, took a call to TAC, but the issues was that we had assigned a native vlan on the Port channel, left the managment interface untagged on the WLC, but the AP-manager interface was still tagged on a specific vlan, so the WCS was trying to join the AP-Manager interface instead of the managment.  so once we commanded:   NO switchport trunk native vlan 160, and tagged the managment interface, everything started working and the WLC joined the WCS.

Thank you Viten Patel of Cisco.  Very smart that one