WLC 5508 connectivity issues

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Jul 23rd, 2010
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I am installing a 5508 into an Alcatel environment.  The APs are 1131, the WLC 5508 however the client opted for Alcatel switches.  I already noticed an incompatability between switches when trying to connect fibre links.  Has anyone ever heard of these issues?  I tried configuring the mgnt port to VLAN specific only however I caannot ping it nor the default gateway when signed on via console.


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Scott Pickles Fri, 07/23/2010 - 12:28
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Vito -

I've never used Alcatel switches, so I don't know what encapsulation they use for trunks.  Just remember that if you place the management interface for the 5508 into the native VLAN by specifying a tag of '0', then make sure that VLAN is also specified as the native VLAN on ALL trunks between the AP and the controller.  If an Alcatel switch uses a proprietary tagging method (like Cisco used to use ISL) where ALL frames are tagged, then you will have to specify the VLAN tag on the management interface.

If I am somehow off on what's going on here, perhaps you could elaborate on what you mean by "incompatability between switches when trying to connect fibre links".


vito.nozza Fri, 07/23/2010 - 12:32
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Thx Scott. That could be the issue. I have placed both the WLC and the switch on a specific Vlan that I assigned for Management. I cannot ping the WLC.

I will do some research on the VLAN and Trunk specifics of Alcatel and see what I find.

BTW, I warned the client that the mixed platform might cause some issues.


Vito Nozza, BA, BCOM,


Sr. Network Design Consultant

4000 Victoria Park

Toronto, Ont

t. 647.747.0417

m. 416.953.7463

e. [email protected]


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