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difference between releases on Cat9800


What is the difference between:
IOS XE Release: Cisco IOS XE Cupertino 17.7.1


IOS XE Release Build Number:


 What does that "11" in the build number refer to and why do we see only "17.7.1" in Software Central?

3 Replies 3

VIP Mentor VIP Mentor
VIP Mentor


 - The build number is an internal subversion scheme for the particular train , meaning that all features (and bugs....) will refer to 'standard' 17.7.1 functionality as described in  Release Notes for 17.7.1 


Rich R
VIP Advisor VIP Advisor
VIP Advisor

17.7.1 is the IOS-XE software release.  Specific components can have sub-version numbers.

For example EWC AP running software version 17.7.1 "show install summary" shows image version with AP image version

9800-80 running 17.6.2 "show install summary" shows image version with APs running image

If you install an AP service pack that would bump up the version number on the AP image without changing the WLC image version.

And if you install a SMU that could change the WLC image version.

For the version numbers in each release see:


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 - 2800/3800/4800 series
- The fix for CSCwd37092 is now released in 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 and 17.3.6 APSP5 (APSP_CSCwd83653)
                     Also fixed in (8.5 mainline) and (8.5 IRCM) if you can't upgrade to 8.10
                     Note that and have been deferred (withdrawn) and are effectively unsupported by Cisco
Richard R
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