topic Unless SW1 and SW2 is a VSS in Wireless

WLC question

ronald.su — Mon, 05 Jul 2021 12:56:46 GMT

Hi , I am facing a problem with my cisco 2500 series WLC.

i have a ssid which named office-group on the wlc. and this ssid have 2 vlans on it, so i made a interface-group which contain vlan5 and vlan8.

and i have a DHCP server on C3750, and made some DHCP ip reserved on vlan5 pool.(some laptop address).

but sometime i can't get the correct IP address which i reserved. finnaly i found i connected on vlan8 which i did not make the reserved.

can / how i specific a laptop force it to connect vlan5 ?

can / how i set the interface priority on interface-group? (that make wireless device can connect vlan5 priority) ----maybe this is not a good idea....

can / how i set the DHCP IP reserved on WLC?

or do you have a better idea ???

so many thanks!!!!

If you use interface group,

Rasika Nayanajith — Mon, 10 Oct 2016 19:18:08 GMT

If you use interface group, it will use round robing #algorithm to assign IP. So it is difficult to assign reserve IP when it use interface group.

Best solution would be increase your subnet size to cater the number of devices you got in wireless.

HTH

Rasika

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can i specific a MAC address

ronald.su — Tue, 11 Oct 2016 01:24:12 GMT

can i specific a MAC address and force it to connect vlan5 ?

I do not think you can, as

Rasika Nayanajith — Tue, 11 Oct 2016 03:21:44 GMT

I do not think you can, as long as you use interface group then there is possibility WLC decide that mac address need to go vlan 8 (or any other vlan in that group), in that case end device may not get vlan 5 IP even though you have reserved it.

If there is a feasibility to give static IP to end device and allow static IP on your WLAN, that may be an option for you.

HTH

Rasika

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Hi Rasika,

john — Fri, 14 Oct 2016 02:56:38 GMT

Hi Rasika,

from the other thread on the AP Fail-over scenario example

AP's is

Primary - .25

Secondary -.24

Tertiary -.23

We have shutdown .25, AP's go to .24, Shutdown .24 AP's go to .23

after we power on the .24, AP remains on .23

once we power on .25, all the AP's go back to .25, but from .23. they dont move to .24

is there any theory behind this?

regards

That's expected behavior. APs

Rasika Nayanajith — Fri, 14 Oct 2016 03:12:10 GMT

That's expected behavior. APs usually check & see if primary WLC reachable,if it is, AP will fallback to primary WLC.

after we power on the .24, AP remains on .23

Since AP not checking a secondary WLC reachability, even that WLC is up, APs wont go there unless it lose current WLC. So AP will remain in .23

once we power on .25, all the AP's go back to .25, but from .23. they dont move to .24

Since .25 is primary WLC, once it come back AP will know it (since it periodically checking for primary WLC availability), as long as it is up AP will fall back to that.

This document explain it

http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-0/configuration-guide/b_cg80/b_cg80_chapter_01101111.html#ID2960

HTH

Rasika

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hi Rasika

john — Fri, 14 Oct 2016 03:51:54 GMT

hi Rasika

can we create the below?

. Configure a WLC Backup Management Interface Port to provide protection against management port failure.

regards,

Configuring LAG (Link

Rasika Nayanajith — Fri, 14 Oct 2016 04:56:31 GMT

Configuring LAG (Link Aggregation) is the recommended approach for any physical port failures of WLC.

What WLC model you got ?

Rasika

WLC 5508, i plan to use two

john — Fri, 14 Oct 2016 07:27:37 GMT

WLC 5508, i plan to use two ports port to CoreSW1 and port 2 on CoreSW2, will lag work on that scenario?

or i create port 1 AP Manager/Management port and create port 2 as back-up port of AP Manager

Regards,

hi Rasika,

john — Mon, 17 Oct 2016 01:02:00 GMT

hi Rasika,

any advise?

regards,

Unless SW1 and SW2 is a VSS

Rasika Nayanajith — Mon, 17 Oct 2016 02:16:44 GMT

Unless SW1 and SW2 is a VSS pair, LAG won't work.

If it is a small deployment where 1Gbps throughput is more than enough, you can go with 2nd option.

Next time start a new thread as what we discussed here is not related to original thread posted. So very difficult to someone find this information by searching.

HTH

Rasika