WLC can't ping MSE

[Bob Bagheri]

I have a MSE and two WLC's.  The MSE and WLC are connected to the same distribution switch, one physical port away from each other.  The WLC is a trunk port, allowing VLAN 101 (managment VLAN/subnet) and the MSE is an Access port on VLAN 101.

I noticed the NMSP connection between these two devices has failed. My ohter WLC connected to the 2nd distribtution switch (same VLAN on both switches) is fine.

I checked the clock / time zone and all three are identical form the same NTP source.

I checked the LBS certificate and both are installed and identical.

However, when I ping from the WLC01 to MSE (on the same switch), ping fails.  BUT, pings frome the MSE to WLC01 and WLC02 work fine.  Fir kicks and giggles, I tried pinging all three devies from the distribution switch w/o any problems.

Any thoughts?

Thanks in advance,
Bob

p.s .ARP looks normal.

[Bob Bagheri]

FWIW, I restarted the NIC service on the MSE and now both MSE and WLC on the same switch can't ping each other.

[Nicolas Darchis]

I'd check the network settings on the MSE. IT's hard to say like this.

Take a sniffer trace and check who is not responding or where are the packets dropped.

It could be litteraly anything, why not a duplicate ip on the network for example ...

[dennischolmes]

What version of code is on each. There are some code mismatch issues around 6.0 to 7.0 code versions.

[Bob Bagheri]

The WLC is 7.0.116

MSE is 7.0.201

WCS is 7.0.172

I just upgraded the entire infrastructure to take advantage of ELM.

Thanks,

Bob

[ericgarnel]

Are you using private vlans by chance?  Also, what is the native vlan for the WLC both on the WLC and the switch trunk port?

[Bob Bagheri]

No pVLAN's, native is 1.

I'm thinking a reboot might be in order for the MSE

[Bob Bagheri]

The reboot of the MSE did the trick.  I can only guess that after upgrading the MSE, it would be a good idea to re-boot the server.

Thank you all for helping.

Re,
Bob