topic It's hard to answer your in Wireless

Back UP Cisco Controller

m.dridi89 — Mon, 05 Jul 2021 10:26:13 GMT

Hello,

i have two controllers 2504 in different sites so differnet subnets and i would like to make the wlc's back up each other so when wlc 1 goes down the aps from that wlc join the wlc2 .

can you please tell me how that could be done ? if the ap had to be flexconnect ?

is HA need to make the managment subnets the same or could be done in our case (differents subnets) ?

The only way this would work

Scott Fella — Fri, 19 Jun 2015 11:51:11 GMT

The only way this would work right now in your design is if all the WLAN's are configured for local switching. If there is even one WLAN that is configured for central switching then you need that backup controller to be on the same site. If the later is the case, then you can buy an HA sku 2504 and use that as the backup. Hope this helps.

-Scott

Thanks Scott, So i need to

m.dridi89 — Fri, 19 Jun 2015 11:56:46 GMT

Thanks Scott,

So i need to make all the aps in flexconnect .in order to make that work ?

"then you can buy an HA sku 2504 and use that as the backup " you mean to put it on the same site as the wlc ???

No you don't need to make

Scott Fella — Fri, 19 Jun 2015 12:28:45 GMT

No you don't need to make everything in FlexConnect mode. I was only telling you how it can be done with one WLC and the limitations since you have multiple sites. If you have local mode AP's, then your better off getting an HA sku 2504 as the redundant unit in each site. This way you configure the HA controller exactly the same as the primary unit with the exception of the hostnames and IP address.

-Scott

Here is an HA N+1 guide you

Scott Fella — Fri, 19 Jun 2015 12:30:12 GMT

Here is an HA N+1 guide you can review.

-Scott

hi Scottlet me make it clair

m.dridi89 — Fri, 19 Jun 2015 12:35:07 GMT

hi Scott

let me make it clair

i had two sites site A: wlc A and site B wlc B the aps are in local mode

and the two site are connected via mpls

i would like to make the ap from site A join the controller of site B when thier WLC goes down

how can i do that without buyin au ha sku

You would need to change the

Scott Fella — Fri, 19 Jun 2015 12:40:33 GMT

You would need to change the ap mode to FlexConnect and also design the environment for local switching. All access points would be on a trunk import and the WLAN's VLAN'swould extend out to the AP. you will also need to review the FlexConnect guides to better understand this setup as there are limitation to using FlexConnect that can hinder you from going this route. Not that simple, due to the configuration changes in the WLC and the network, but can be done.

-Scott

Thanks Scott,Please can you

m.dridi89 — Fri, 19 Jun 2015 12:45:54 GMT

Thanks Scott,

Please can you tell me what do you mean by HA sku 2504 is it a license ?? or module ??

the HA as i know need to be performed in same subnet so what is the difference between backup and HA?

It is a part number for a WLC

Scott Fella — Fri, 19 Jun 2015 12:52:33 GMT

It is a part number for a WLC. Backup and HA are used interchangeably. You can review the HA N+1 guide for further reference on that.

-Scott

thanks Scott for your help

m.dridi89 — Fri, 19 Jun 2015 12:54:41 GMT

thanks Scott for your help

hi, after some research

m.dridi89 — Fri, 19 Jun 2015 13:31:05 GMT

hi,

after some research when we say ha-sku do we mean when we put the controller redundant and secondary ??

is there an active-active HA

An HA sku is for redundancy.

Scott Fella — Fri, 19 Jun 2015 14:07:08 GMT

An HA sku is for redundancy. You would need to buy a 2504 with license if you want active active where you can put half the AP's in one controller and the other AP's on the other. HA sku is again strictly for a backup controller design.

-Scott

hi, ok , but what is HA-SKU ?

m.dridi89 — Fri, 19 Jun 2015 14:16:08 GMT

hi,

ok , but what is HA-SKU ??? is it a technology or just in an appliance

like 2504-air-ha-sku-k9??

It is an appliance. Part

Scott Fella — Fri, 19 Jun 2015 14:57:09 GMT

It is an appliance. Part numbers can be found in the data sheet for the device:

Table 3. Ordering Information for Cisco 2500 Series Wireless Controllers

Part Number	Description	Cisco SMARTnet^® 8x5xNBD
AIR-CT2504-5-K9	2500 Series Wireless Controller for up to 5 Cisco access points	CON-SNT-CT255
AIR-CT2504-15-K9	2500 Series Wireless Controller for up to 15 Cisco access points	CON-SNT-CT2515
AIR-CT2504-25-K9	2500 Series Wireless Controller for up to 25 Cisco access points	CON-SNT-CT2525
AIR-CT2504-50-K9	2500 Series Wireless Controller for up to 50 Cisco access points	CON-SNT-CT2550
AIR-CT2504-HA-K9^*	Cisco 2500 Series Wireless Controller for High Availability	CON-SNT-CT2504HA

Here is a link to the data

Scott Fella — Fri, 19 Jun 2015 14:58:50 GMT

Here is a link to the data sheet also:

http://www.cisco.com/c/en/us/products/collateral/wireless/2500-series-wireless-controllers/data_sheet_c78-645111.html

-Scott

hi,so, in my case can i use N

m.dridi89 — Fri, 19 Jun 2015 22:00:39 GMT

hi,

so, in my case can i use N+1 HA ??

even that i have a different subnets and two cisco 2504-5-K9??t if no what should i do without buying ???

If your subnet are different

Scott Fella — Fri, 19 Jun 2015 22:04:34 GMT

If your subnet are different because the wlc are in different locations, without buying you would need to change to FlexConnect. Otherwise you don't have any redundancy.

-Scott

ok but after studing the N+1

m.dridi89 — Fri, 19 Jun 2015 22:09:56 GMT

but after studing the N+1 HA

they told that the N+1 is deployed for to WLC in separte subnets what do they mean by that ??

how to change my controller from c2504-5 to ha-sku do i need a license or should i buy the appliance with 2504-ha-sku??

You can't change the part

Scott Fella — Fri, 19 Jun 2015 22:17:26 GMT

You can't change the part number of any device. If you want to use N+1, then you need to still use FlexConnect. It's a design thing that you need to understand. FlexConnect bs Local mode and how the traffic needs to flow. If you currently have two site with a 2504 at each location and the wireless devices get an IP address from the local site, then if you don't care that if one WLC fails and all the AP's job n the other WLC, then you need to have a large enough subnet for both sites. If you have static IP address in some devices, then they will break. So understand the traffic flow and you will be able to understand if FlexConnect is required or local mode AP's with buying redundant wlc a for each site on not.

-Scott

yes ,but my question is am i

m.dridi89 — Fri, 19 Jun 2015 22:24:20 GMT

yes ,

but my question is am i able to use N+1 for my case you see

in my first site i had 192.168.99.x for managment and the other site 10.1.99.x

is that meet my requierment to use N+1 ?? since i read that N+1 can be used for defferent subnets ??