My SAN-OS skills are wack

I was making some port-channels between one of our MDS 9513 director switches and a 9124e edge and managed to add the interfaces to the wrong port-channel. Here’re the basic steps on the 9124e end that I took to rectify the issue. I’ve created a pdf file which, while inconvenient, solves the problems related to both my wordpress skills and the age of the theme I use. That is, a 4 page doc was going to look pretty ugly if I tried to insert it in-line. I apologise in advance for the inconvenience you will no doubt experience.

Cisco 9124(e) firmware downgrade

Sometimes, for any number of reasons, you’ll find yourself wanting to downgrade the firmware on your Cisco edge devices to match what you have running in the core. Fortunately, at least for the 9100-series switches, this is basically the same as upgrading the firmware. I’ve included the commands to run here, and also the full output of the process. For the director-class switches, there are a few more things to do, such as clearing out the space on the standby supervisor as well as the active sup card. I’ll try and post something 9500-series specific in the next few weeks.

In short, do this (assuming you’re loading version 3.3(4a) of the code):

copy running-config startup-config

copy startup-config tftp://

show module

copy tftp:// bootflash:m9100-s2ek9-mz.3.3.4a.bin

copy tftp:// bootflash:m9100-s2ek9-kickstart-mz.3.3.4a.bin

dir bootflash:

show version image bootflash:m9100-s2ek9-mz.3.3.4a.bin

show incompatibility system m9100-s2ek9-mz.3.3.4a.bin

install all system bootflash:m9100-s2ek9-mz.3.3.4a.bin kickstart bootflash:m9100-s2ek9-kickstart-mz.3.3.4a.bin


show module

show version

You can also see the full output here. Note that this process works equally well for HP’s 9124e switches (the type you find in the back of c7000 blade chassis for instance), although you should be downloading the firmware from HP’s site, not Cisco’s.