3845 IOS Upgrade

[Carlos Aguinaldo]

Hi All,

We are planning to upgrade two of our old 3845 routers running DLSW to 15.1.4M12a, the current MD release. Here are the existing codes.

DLSWR-01#sh ver | i IOS
Cisco IOS Software, 3800 Software (C3845-ADVENTERPRISEK9-M), Version 12.4(16b), RELEASE SOFTWARE (fc3)

DLSWR-02#sh ver | i IOS
Cisco IOS Software, 3800 Software (C3845-ADVENTERPRISEK9-M), Version 12.4(16b), RELEASE SOFTWARE (fc3)

Should this be a straight upgrade or is there an upgrade path? I couldn't find anything on the release notes and just wanted to be sure.

Thanks in advance.

[Joseph W. Doherty · Accepted solution]

I believe it's a straight upgrade - however, you do want to insure you have sufficient RAM and flash for 15.x

[Carlos Aguinaldo]

Thanks Joseph. Yes, I've freed up some flash. Is there a specific RAM requirement? Couldn't find a specific recommendation in the notes too.

[Joseph W. Doherty]

RAM requirements, should be on the download page, per image.

[Carlos Aguinaldo]

Got it, thanks.  It states 512/128 on the download page for 15.1.4M12a. I'm assuming this is 512Kb?

Here is the current RAM usage.

DLSWR-01#sh ver | i memor
Cisco 3845 (revision 1.0) with 221184K/40960K bytes of memory.

I believe this states I have 262.144Mb free right?

[Joseph W. Doherty · Accepted solution]

No, it's MB.

Your 3845 looks to have 256 MB (common for that model), but your selected 15.x needs 512 MB.

[Carlos Aguinaldo]

Thanks.

[Leo Laohoo]

And don't forget to read the Release Notes.