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IOS upgrade for 2501/2503

Unanswered Question
Dec 11th, 2003
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Our current IOS on 2501 & 2503 was 11.0(9) and seemed not to support MIB-2 (no Frame-Relay sub-interface on SNMP).

Is there any handy step to upgrade the IOS?

What is the stable release for 2501 & 2503 with 8MB flash & 4MB RAM?

If upgrade failed, is there a fallback?



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lgijssel Thu, 12/11/2003 - 11:28
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Hello Benny

You could upgrade to 12.0 when you are running an image with not too many features, IP only will run but you will need to add RAM for most others.

What feature set are you running now?

If the upgrade fails: with the 2500 there is a boot load helper, but only as long as you have an IOS running. If you loose that, you are left with the boot monitor which is still ok for newer models, but is pretty basic on a 2500.



bsomali Thu, 12/11/2003 - 11:39
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Hi Leo,

It was IP only.

Do you have handy steps to do the upgrade?

What is the use of boot load helper and boot monitor?



kkalaycioglu Thu, 12/11/2003 - 14:16
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Second question first:

ROMMON is located in ROM and is the lowest level and the first loaded operating system (after POST and bootstrap code) residing in a cisco router. It's mainly used for hardware troubleshooting purposes (of course by TAC personel).

Bootloader (sometimes named as RxBoot or MiniIOS) is loaded after rommon during startup and provides a limited subset of full IOS (It provides IP connectivity but can not perform IP routing).

This document can explain sw upgrade procedure :




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