ISR 4300 - Upgrade to Fuji 16.7.1 from IOS XE 3.x

[Bill]

Can I upgrade an ISR 4351 from IOS XE 3.16.06 directly to Fuji 16.7.1 ?

The 16.7.1 release notes have me a little confused.

In the release notes under the upgrade section, it says "obtain a Cisco IOS XE Everest 16.4.1 consolidated package"

Do I need to go to version 16.4.1 before upgrading to 16.7.1, or is this a type-o in the release notes?

I've found a migration guide but it only covers up to IOS XE version 16.3.

Thanks

[Leo Laohoo · Accepted solution]

Yes and no.
Read the Release Notes very carefully. You can upgrade direct from 3.X.X to 16.X.X, however, you need to upgrade the ROMmon FIRST before upgrading the IOS. Instructions on how to upgrade the ROMmon can also be found in the Release Notes.

[Mark Malone]

If your doing upgrades/downgrades remotely to Everest Denali etc from standard ios-xe you could loose your RSA keys it caught me out before they don't transfer  , left us without remote access , this script regenerates the keys as its rebooting when remote

example form one of the docs

When you upgrade to Cisco IOS XE Denali 16.3.5 the SSH access is lost, because it cannot use the CISCO_IDEVID_SUDI_LEGACY RSA server key.

event manager applet EEM_SSH_Keygen
event timer cron cron-entry "@reboot"
action 0.0 info type routername
action 0.1 set status "none"
action 1.0 cli command "enable"
action 2.0 cli command "show ip ssh | include ^SSH"
action 2.1 regexp "([ED][^ ]+)" "$_cli_result" result status
action 3.0 if $status eq "Disabled"
action 3.1  cli command "configure terminal"
action 3.2  cli command "crypto key generate rsa modulus 2048 label $_info_routername"
action 3.3  cli command "end"
action 3.4 end

[Bill]

Thanks Mark

Good advice. I wasn't aware of that, but I would have gotten bit by it.

And thanks for the script.

[Bill]

Thanks Leo

I'll be sure to check the ROMMON versions.

I was a little unsure because of the wording of the upgrade section, where it mentions 16.4.1

But if ROMMON version is good, I can go direct to 16.7.1.