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How can I configure WLC 2504 to do HA (N+1) method?

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Apr 1st, 2014
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I have WLC 2504 (version 7.6.110.0). I would like to do HA with AIR-CT2504-HA-K9. How can I configure to do HA (N+1)?

I cannot find any document that do HA (N+1) with WLC 2504.

 

Thank you.

 

 

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Overall Rating: 4.6 (6 ratings)
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Paniphon Tanomp... Tue, 04/01/2014 - 04:07
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Hi Kaaftab,

I have already read these guides from other reply in this Cisco Support Community but I cannot find the exact method.

 

Thank you.

Paniphon Tanomp... Tue, 04/01/2014 - 08:44
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Hi Kaaftab,

Thank you for your reply. I have ever read that guide before but it doesn't show the HA method of WLC 2504 model.

If you use WLC 2504 (version 7.6.110.0 or below version), you will not see "Redundancy" menu as the attached file.

 

Please advise me.

 

Thank you.

Paniphon Tanomp... Tue, 04/01/2014 - 19:57
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Hi Kaaftab,

According to the above link, I understand that WLC 2500 is not supported "High Availablility (1:1)" that mean it is not supported SSO HA not N+1 HA. (If I am wrong, please correct me)

 

Moreover, I don't know which license that I need to buy to add this feature.

 

Please advise me.

 

Thank you.

Paniphon Tanomp... Thu, 04/10/2014 - 09:36
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Does anyone ever configure WLC 2504 (version 7.6.110.0) to do HA with AIR-CT2504-HA-K9?

 

Thank you

bruno.paques Fri, 04/25/2014 - 02:34
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i configure with 7.6.110.0 and its ok.

but there are not this option in 7.4.121.0

How activate ha-sku with 7.4.121.0 ?

 

Attachment: 
Scott Fella Fri, 04/25/2014 - 06:01
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With the 2504, the method of deploying an HA sku using N+1, is the same as if you had two licensed WLC's.  Configure both WLC's and just make sure the hostname and ip address used for management and the dynamic interfaces are different.  The VIP should be the same along with the mobility group, rf group, etc.  The main thing is to define the WLC's as the primary and secondary on the AP itself.  If you click on the AP, there is a tab called High Availability.  In that tab, you enter the hostname of the WLC, this is case sensitive, and the ip address of the WLC.  That is all you need to do.

For failover to happen, make sure you have Fallback enabled on the main screen in the Controller tab of both WLC's.

Here is a link to that:

http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan...

The HA Guide for N+1 is the same for all WLC's that support HA.  The only difference between the 2504 and the higher end models is that there is no service port, and of course the backplane and other higher end stuff:)

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Scotty

Paniphon Tanomp... Mon, 04/28/2014 - 21:49
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Hi Scotty,

I tried to configure wireless controller both primary and secondary (HA unit) as your recommendation but it is not working.

When I tried to failover to Secondary controller, the Wireless AP shows error message "%CAPWAP-3-ERRORLOG: Could Not resolve CISCO-CAPWAP-CONTROLLER"

My configuration step as follows (Please correct me, if I am wrong)

1) Configure Mobility Group

2) Configure High Availability: "Backup Primary Controller IP Address" at Primary Controller

3) Configure High Availability: to input Primary and Backup controller IP Address at Wireless AP.

For more information, please see attached files.

 

I am not sure that Do I need the license to install to Secondary controller (HA-SKU)? because the license on Secondary Controller (HA-SKU) shows status "Not in Use" as the attached file.

 

Please advise me.

 

Thank you.

 

 

Scott Fella Mon, 04/28/2014 - 23:37
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Remove the entry in your ha_1.jpg and try it again. When failing over, try to just unplug WLC primary from the network. Make sure that the WLC name you entered on the AP high availability tab is correct and is case sensitive. 

 

 

Paniphon Tanomp... Tue, 04/29/2014 - 00:49
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Hi Scotty,

Thank you for your reply. I succeed to do the failover HA.

My configuration step as follows:

1) Configure Mobility Group on both Primary and Secondary Controllers.

2) Configure High Availability: "Backup Primary Controller IP Address" at Primary Controller.

3) Configure High Availability: to input Primary and Backup controller IP Address at Wireless AP.

4) Enable "AP Fallback" on both Primary and Secondary Controllers.

5) You need to cut license off by entering command "redundancy unit secondary" on Secondary controller (HA SKU).

 

Thank you for every recommendation.

Nash

Scott Fella Tue, 04/29/2014 - 05:37
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That command is only when you are configuring AP SSO, not N+1.  When you setup N+1, you configure it the same as if you had two licensed WLC's.  I have never had to initiate that command on any of my N+1 installs to be honest. 

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Scotty

Jerome Tissieres Fri, 07/25/2014 - 00:52
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In fact this command is very useful if the 2nd WLC have only a base_license.

For example, for a N+1 configuration with two 2504:  you can order one 2504 with for example a license for 50AP and a 2nd 2504 with only a base license. In fact, when you order a AIR-CT2504-HA-K9 you receive a 2504 with only the base license. But then, when you enter the command "redundancy unit secondary" on it, it have the max license supported by the hardware (75 in this case).

Thank you to both of you Scott and Nash, this post solves my problem yes

Cheers,
Jerome

Sandeep Choudhary Fri, 07/25/2014 - 02:12
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Hi,

As per my experiment, this command is mandatory to make 2nd WLC to secondary and then save & also reboot WLC to take effect of this Command.

Here is my post:http://rscciew.wordpress.com/2014/06/07/n1-high-availability-configurati...

 

Here is the attached pic:


By default its disabled. once you run this command it will enable this feature.

 

Regards

jacob.fredriksson Mon, 04/27/2015 - 00:52
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Is is mandatory to configure the Primary Controller and Secondary Controller on every single access point manually (under the High Availability tab)? When we add the Backup Controller IP Address on the WLC itself, is that information not pushed out to the access points?

Hideyuki Osaki Mon, 06/02/2014 - 21:58
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Same as 5508. The HA SKU, AIR-CT2504-HA-K9 needs a configuration "config redundancy unit secondary" explicitly if you would like to make the HA SKU work as Backup controller of N+1 solution. (You cannot see it in GUI in 7.4 code but CLI only)

The command "config redundancy unit secondary" is required not only for SSO usage but also for N+1 usage.

 

Regards,

Hide

Scott Fella Wed, 07/02/2014 - 19:07
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The unit will continue to function in an N+1 fashion. Nothing to worry about as I have many installs in which the time has expired and AP's still join the controller. 

Hideyuki Osaki Wed, 07/02/2014 - 19:30
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Scott is correct. HA SKU does not use or even check any license at all. Hence it does not matter whether you have active or expired license.

The meaningless Eval license may be able to be deleted in the future by a following enhancement;

CSCum75965    HA-SKU WLCs have no way of deleting eval license

Coming on release 8.0.

Sandeep Choudhary Wed, 07/02/2014 - 23:49
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HI TONY;

The license issues start once an AP associates to the controller,after 90 days it starts sending syslog and SNMP traps regarding the license.

keep in mind was to use the standby as a standby and not have any APs on it regularly.

12 week and 6 days = 90 days.Once APs are connected to HA WLC then you can check  management > Software Activation > License Usuage.

-------------------------

If you have 5508 series WLC then you can use this commands

(Controller-Standby) >show redundancy summary
Redundancy Mode = SSO ENABLED
Local State = STANDBY HOT
Peer State = ACTIVE
Unit = Secondary – HA SKU (Inherited AP License Count = 25)

 

I hope it helps.

Regards

Prakash Parvathala Mon, 04/27/2015 - 07:22
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Remember the below points:

 

1:The N+1 HA setup provides redundancy for controllers across separate data centers with low cost of deployment.

2:These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different data centers across the WAN link.

3:We must configure and manage both WLC separately.

 

Please go through the below link for configuration guide

Here you go : http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html

 

Prakash Parvathala Mon, 04/27/2015 - 07:24
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Remember the below points:

 

1:The N+1 HA setup provides redundancy for controllers across separate data centers with low cost of deployment.

2:These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different data centers across the WAN link.

3:We must configure and manage both WLC separately.

 

Please go through the below link for configuration guide

Here you go : http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html

 

Prakash Parvathala Mon, 04/27/2015 - 07:25
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Remember the below points:

 

1:The N+1 HA setup provides redundancy for controllers across separate data centers with low cost of deployment.

2:These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different data centers across the WAN link.

3:We must configure and manage both WLC separately.

 

Please go through the below link for configuration guide

Here you go : http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html

 

Prakash Parvathala Mon, 04/27/2015 - 07:26
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  • Silver, 250 points or more

Remember the below points:

 

1:The N+1 HA setup provides redundancy for controllers across separate data centers with low cost of deployment.

2:These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different data centers across the WAN link.

3:We must configure and manage both WLC separately.

 

Please go through the below link for configuration guide

Here you go : http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html

 

Prakash Parvathala Mon, 04/27/2015 - 07:26
User Badges:
  • Silver, 250 points or more

Remember the below points:

 

1:The N+1 HA setup provides redundancy for controllers across separate data centers with low cost of deployment.

2:These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different data centers across the WAN link.

3:We must configure and manage both WLC separately.

 

Please go through the below link for configuration guide

Here you go : http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html

 

Prakash Parvathala Mon, 04/27/2015 - 07:26
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  • Silver, 250 points or more

Remember the below points:

 

1:The N+1 HA setup provides redundancy for controllers across separate data centers with low cost of deployment.

2:These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different data centers across the WAN link.

3:We must configure and manage both WLC separately.

 

Please go through the below link for configuration guide

Here you go : http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html

 

dgohain Thu, 04/20/2017 - 18:31
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With Release 7.4, an HA-SKU secondary controller can be configured as a backup controller for N+1 HA

N+1 HA would be supported by 2504 from 7.5 onwards as it is HA-SKU WLC now.

We would need minimum 5 licenses to enable the code  to support HA-SKU on secondary WLC.

The licenses would not affect our AP support as they would remain disabled in secondary WLC.


http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_Hig...



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