Understanding the New Master Selection Criteria for Cisco Mobility Express Master AP Failover

[Translator]

The following two official documents have been referenced to determine the criteria for selecting a Master AP for Cisco Mobility Express.

1. Cisco Mobility Express Deployment Guide Release 8.8https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-8/b_cisco_mobility_express_8_8/m_master_ap_failover.html#task_4B67B720FC334BB3BF8977D6BC5BFC93
2. Cisco Mobility Express User Guide for Cisco Wireless Release 8.10 https://www.cisco.com/c/ja_jp/td/docs/wireless/access_point/mob_exp/810/user_guide/b_ME_User_Guide_810/b_ME_User_Guide_810_appendix_01001.html#concept_5207A1BAEE0B4D5489C032DF2A7D3377:~:text=%E3%82%92%E5%8F%97%E3%81%91%E3%81%BE%E3%81%99%E3%80%82-,%E...

The differences between the 8.8 Deployment Guide and the 8.10 User Guide are as follows:

[8.10 User Guide]

1. The AP with the longest controller uptime

2. APs configured in Next Preferred Master on VRRP

3. APs with the fewest client connections

4. AP with lowest MAC address

5. VRID Settings

[8.8 User Guide]

1. User-defined APs

2. APs configured for Next Preferred Master (※This is probably equivalent to the 8.8 "APs configured for Next Preferred Master on VRRP")

1. Highest performance AP

4. APs with the fewest client connections

5. AP with lowest MAC address

In this case, which order will the APs with the longest controller uptime be ranked in the User's Guide?

If you combine both information, you can interpret it as the following order, but I want to make sure that this recognition is correct.

1. User-defined APs

2. The AP with the longest controller uptime

3. AP set to Next Preferred Master

4. Highest performance AP

5. APs with the fewest client connections

6. AP with lowest MAC address

7. VRID Settings

[Translator]

A comparison of the relevant parts of a document of the same type
The algorithm appears unchanged.
In some cases, the document format may differ slightly depending on the version.
This time, I compared those different things and felt like there was a difference.

Cisco Mobility Express User Guide, Cisco Wireless Release 8.10 - Concepts, FAQs, and Information for Advanced Users [Cisco Mobility Express for Aironet Access Points] - Cisco
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/810/user_guide/b_ME_User_Guide_810/appendix.html
> Primary AP Election Process
> In a Cisco Mobility Express network, when the primary AP shuts down, one of the other primary-capable APs in this deployment is automatically designated as the primary AP. The automatic selection of the primary AP among the Cisco Mobility Express-capable APs is as per an internal automatic primary election process. This process is used to both detect the failure of the primary AP and to designate the new primary AP among the eligible APs. This process is based on Virtual Router Redundancy Protocol (VRRP) that algorithmically determines the next primary AP, based on the following parameters listed in the order of descending precedence:
>
> The AP with highest controller up-time compared to other Cisco Mobility Express-capable APs
>
> The AP configured as VRRP primary, using the VRRP command config ap next-preferred-master on the controller's CLI.
>
> The AP with the least load in terms of the number of associated clients associated.
>
> Among APs with a similar client load, the AP with the lowest MAC address.
>
> Configuring VRID

Cisco Mobility Express User Guide, Cisco Wireless Release 8.8 - Concepts, FAQs, and Information for Advanced Users [Cisco Mobility Express for Aironet Access Points] - Cisco
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/88/user_guide/b_ME_User_Guide_88/appendix.html
> Primary AP Election Process
> In a Cisco Mobility Express network, when the primary AP shuts down, one of the other primary-capable APs in this deployment is automatically designated as the primary AP. The automatic selection of the primary AP among the Cisco Mobility Express-capable APs is as per an internal automatic primary election process. This process is used to both detect the failure of the primary AP and to designate the new primary AP among the eligible APs. This process is based on Virtual Router Redundancy Protocol (VRRP) that algorithmically determines the next primary AP, based on the following parameters listed in the order of descending precedence:
>
> The AP with highest controller up-time compared to other Cisco Mobility Express-capable APs
>
> The AP configured as VRRP primary, using the VRRP command config ap next-preferred-master on the controller's CLI.
>
> The AP with the least load in terms of the number of associated clients associated.
>
> Among APs with a similar client load, the AP with the lowest MAC address.
>
> Configuring VRID

If there is a clear behavior change, Release Notes may also be listed somewhere between versions.

Cisco Mobility Express for Aironet Access Points - Release Notes - Cisco
https://www.cisco.com/c/en/us/support/wireless/mobility-express/products-release-notes-list.html

[Translator]

Thank you for your reply.

The Cisco Mobility Express User's Guide found both 8.8 and 8.10 versions, but the Deployment Guide did not find the 8.10 version.

Therefore, it is not possible to directly compare the user guide and the introduction guide between the same versions.

Rather than the different versions of the documentation, you want to see the differences between the User's Guide and the Deployment Guide (the final priority, the combined information of each).