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How to understand the following sentence?

Rps-Cheers
VIP Collaborator VIP Collaborator
VIP Collaborator

ISSU is supported only within and between major releases, for example, 17.3.x to 17.3.y, 17.6.x to 17.6.y (within a major release) and 17.3.x to 17.6.x, 17.3.x to 17.9.x (among major releases), that is, for two releases after the current supported release. ISSU is NOT supported within and between minor releases or between minor and major releases, for example 17.4.x to 17.4.y or 17.4.x to 17.5.x or 17.3.x to 17.4.x.

https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-2/config-guide/b_wl_17_2_cg/in_service_software_upgrade.html#id_128298

 

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Rps-Cheers | If it solves your problem, please mark as answer. Thanks !
2 Accepted Solutions

Accepted Solutions

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

@Rps-Cheers wrote:

It's hard to understand


There is a "Feedback" option.  Put your comments in.  

All I can say is:  ISSU and FSU/eFSU, is not "worth it".  

I do not want to be the developer's "guinea pig".  If they do not want to test ISSU/FSU/eFSU on their own, then I sure wouldn't either.  

View solution in original post

Rich R
VIP Advocate VIP Advocate
VIP Advocate

As to the original question I think it's self explanatory - which part don't you understand?

1. It is only supported in the extended support releases 17.3, 17.6, 17.9

2. You can only use it to go from within one of those releases to another dot release of that version eg. 17.3.1 to 17.3.3 or between those releases eg. 17.3.1 to 17.6.1

3. It's only supported up to 2 releases later eg 17.3.1 to 17.9.1 = supported but 17.3.1 to 17.12.1 not supported because that's 3 releases later but 17.6.1 to 17.12.1 would be supported.

But if you going to use ISSU then read the release notes very carefully and test thoroughly (to make sure it works with your network and configuration) then use at your own risk.  As others have said it can often cause more problems than it solves.

___________________________________________
TAC recommended codes for AireOS WLC's
Best Practices for AireOS WLC's
TAC recommended codes for 9800 WLC's
Best Practices for 9800 WLC's
Cisco Wireless compatibility matrix
Field Notice: FN-72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Recommended
WARNING - see CSCwd37092 Throughput degraded after upgrading to code 8.10.181.0/17.3.6 - 2800/3800/4800 series
- The fix for CSCwd37092 is now released in 8.10.183.0 and
- For IOS-XE 17.3.6 select controller model, go to IOS XE Software AP Service Pack, select CSCwd40096 17.3.6 APSP2
Field Notice: FN-63942 Lightweight APs and WLCs Fail to Create CAPWAP Connections Due to Certificate
                      Expiration - Software Upgrade Recommended
Field Notice: FN-72524 - During Software Upgrade/Downgrade IOS APs Might Remain in Downloading State
                     After 4 Dec 2022 Due to Certificate Expiration - Fixed in 8.10.183.0 and 17.3.6 APSP5 (APSP_CSCwd83653)
                     Also fixed in 8.5.182.7 (8.5 mainline) and 8.5.182.105 (8.5 IRCM) if you can't upgrade to 8.10
                     Note that 8.10.181.0 and 8.10.182.0 have been deferred (withdrawn) and are effectively unsupported by Cisco
___________________________________________
Richard R

View solution in original post

9 Replies 9

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

My take:  Do not make any attempt to use ISSU or FSU/eFSU -- It only works in "corner cases" or in a lab.  

Hahaha, I also feel the same way, but I still can't understand what the Cisco documentation says about the ISSU upgrade method. It's hard to understand, although we basically don't use ISSU.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rps-Cheers | If it solves your problem, please mark as answer. Thanks !

ISSU works well, if no config or plain system - not in production. production always tricky as per the many users (myself failed and not really tested in real production my point of view).

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Although I haven't tried ISSU, it doesn't seem to be suitable for production .

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Rps-Cheers | If it solves your problem, please mark as answer. Thanks !

yes i would advise not to take chance, until you want to help for Cisco for testing by doing volunteering.!

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

@Rps-Cheers wrote:

It's hard to understand


There is a "Feedback" option.  Put your comments in.  

All I can say is:  ISSU and FSU/eFSU, is not "worth it".  

I do not want to be the developer's "guinea pig".  If they do not want to test ISSU/FSU/eFSU on their own, then I sure wouldn't either.  

great idea, thanks for your reply

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rps-Cheers | If it solves your problem, please mark as answer. Thanks !

Rich R
VIP Advocate VIP Advocate
VIP Advocate

As to the original question I think it's self explanatory - which part don't you understand?

1. It is only supported in the extended support releases 17.3, 17.6, 17.9

2. You can only use it to go from within one of those releases to another dot release of that version eg. 17.3.1 to 17.3.3 or between those releases eg. 17.3.1 to 17.6.1

3. It's only supported up to 2 releases later eg 17.3.1 to 17.9.1 = supported but 17.3.1 to 17.12.1 not supported because that's 3 releases later but 17.6.1 to 17.12.1 would be supported.

But if you going to use ISSU then read the release notes very carefully and test thoroughly (to make sure it works with your network and configuration) then use at your own risk.  As others have said it can often cause more problems than it solves.

___________________________________________
TAC recommended codes for AireOS WLC's
Best Practices for AireOS WLC's
TAC recommended codes for 9800 WLC's
Best Practices for 9800 WLC's
Cisco Wireless compatibility matrix
Field Notice: FN-72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Recommended
WARNING - see CSCwd37092 Throughput degraded after upgrading to code 8.10.181.0/17.3.6 - 2800/3800/4800 series
- The fix for CSCwd37092 is now released in 8.10.183.0 and
- For IOS-XE 17.3.6 select controller model, go to IOS XE Software AP Service Pack, select CSCwd40096 17.3.6 APSP2
Field Notice: FN-63942 Lightweight APs and WLCs Fail to Create CAPWAP Connections Due to Certificate
                      Expiration - Software Upgrade Recommended
Field Notice: FN-72524 - During Software Upgrade/Downgrade IOS APs Might Remain in Downloading State
                     After 4 Dec 2022 Due to Certificate Expiration - Fixed in 8.10.183.0 and 17.3.6 APSP5 (APSP_CSCwd83653)
                     Also fixed in 8.5.182.7 (8.5 mainline) and 8.5.182.105 (8.5 IRCM) if you can't upgrade to 8.10
                     Note that 8.10.181.0 and 8.10.182.0 have been deferred (withdrawn) and are effectively unsupported by Cisco
___________________________________________
Richard R

@Rich RThanks for you explanation

From what you've said, it's really clear.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rps-Cheers | If it solves your problem, please mark as answer. Thanks !
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