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C9800 N+1 AP Fallback Configuration - AP Priming and AP Join Profile B

RYXYLISHX
Level 1
Level 1

Hi,

We are configuring an N+1 redundancy setup with C9800-40 (IOS XE 17.9.4) and are currently evaluating the best approach for AP fallback configuration.
We are considering two options: AP Priming and enabling "AP Fallback to Primary" in the AP Join Profile.

We have some questions regarding the behavior of these configurations and need clarification on the following scenarios:

1. AP Priming Configuration:
When configuring AP priming on the WLC for specific APs using the "priming <priming_profile_name>"command, is the configuration immediately applied to the AP?
If so, does this trigger an AP reset or CAPWAP reset?

If AP tag persistence is enabled, will the priming configuration be retained when the AP connects to a different WLC (e.g., during a failover event)?


2. AP Join Profile Fallback Configuration:
When enabling the "AP Fallback to Primary" option in the AP Join Profile, is this configuration immediately applied to the AP?
If so, does this trigger an AP reset or CAPWAP reset?

We would appreciate any insights into the expected behavior of these configurations, especially regarding the potential for AP resets or CAPWAP resets.
We are trying to determine which method is more suitable for our environment.

Thank you in advance for your assistance.

6 Replies 6

marce1000
Hall of Fame
Hall of Fame

 

@RYXYLISHX  >...When configuring AP priming on the WLC for specific APs using the "priming <priming_profile_name>"command, is the configuration immediately applied to the AP?
        Yes
            If so, does this trigger an AP reset or CAPWAP reset?
                    No

         If AP tag persistence is enabled, will the priming configuration be retained when the AP connects to a different WLC (e.g., during a failover event)?
                   Yes

2. AP Join Profile Fallback Configuration:
When enabling the "AP Fallback to Primary" option in the AP Join Profile, is this configuration immediately applied to the AP?
             Note sure but enable https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/enabling-syslog-messages-in-access-points-and-controller-for-syslog-server.html
             Look into logs generated from AP(s)
If so, does this trigger an AP reset or CAPWAP reset?
            No

We would appreciate any insights into the expected behavior of these configurations, especially regarding the potential for AP resets or CAPWAP resets.
    - You won't have CAPWAP resets in any scenario; what I consider most important is to always
       validate a (new) C9800-40 controller's configuration using the CLI command 
       show tech wireless (not a simple show tech-supportand feed the output from that into Wireless Config Analyzer
                                                                                                                                                                           A must do!!

  M.



-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
    When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Hi marce1000 and Rich R,

Thank you both for your responses!
I really appreciate you taking the time to help.

marce1000, regarding either AP priming settings or enabling "AP Fallback to Primary" in the AP Join Profile, you mentioned that these settings are applied immediately to the AP.
However, I'm still unclear on whether this causes an AP reset or CAPWAP reset.
Is it possible for the settings to be changed without affecting the AP's connection?

Rich R, thanks for the heads-up about the security vulnerability in 17.9.4.
We're planning to upgrade to a newer version soon, and we're taking that into account.

Thanks again for your help!

> However, I'm still unclear on whether this causes an AP reset or CAPWAP reset.
> Is it possible for the settings to be changed without affecting the AP's connection?
Neither, those changes themselves will not affect the AP's connection.  But if it's first join and the AP gets the tags for the first time it's going to do a CAPWAP reset anyway.
If/when it moves to primary it will do a CAPWAP reset.

 

@RYXYLISHX >..regarding either AP priming settings or enabling "AP Fallback to Primary" in the AP Join Profile, you mentioned that these settings are applied immediately to the AP.
However, I'm still unclear on whether this causes an AP reset or CAPWAP reset.
                                     If the AP is currently not joined with the Primary controller then it will reconnect to it when it becomes available again and there will be a CAPWAP reset,

 M.



-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
    When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Rich R
VIP
VIP

When an AP moves from one WLC to another CAPWAP will always be reset because the AP needs to re-join.
Providing the config and software version are the same on both WLCs there should be minimal disruption.

You should not be using 17.9.4 - apart from anything else it has a critical security vulnerability.
Always refer to the TAC recommended page (link below) for current recommended code versions.
17.9 has already passed the End of Software Maintenance date (no more bug fixes) so you should really be thinking about using 17.12 or later.
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xe-17/ios-xe-17-9-x-eol.html

RYXYLISHX
Level 1
Level 1

Hi marce1000 and Rich R,

Thank you both for your quick responses to my question! I appreciate you taking the time to help.

I apologize that my initial question wasn't clear. I realize now that I didn't provide enough context.

What I was hoping to understand is this: If an AP is already joined to a WLC, and then I configure either AP Priming or an AP Join Profile, does that configuration take effect immediately? And if it does take effect immediately, does that trigger an AP reset or a CAPWAP reset?

Essentially, I'm trying to determine if these configuration changes can be applied without any service interruption.

Based on your replies, my understanding is that the configuration will be applied when the AP reconnects to the WLC. Is that correct? I just want to confirm that I'm looking for a way to apply the changes without impacting the AP while it is actively serving clients.

Thanks again for your assistance!

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