Erase flash lesson

Issued this on one of my 2950-12s to really understand the process. I had a couple c2950 bin files on hand, so wanted to learn the recovery process since I've never done this before.

Putty i guess does not have xmodem, but Tera Term worked. Set the baud speed to 115200 on the switch and in the term software and only took a few minutes to load 3meg file.

Didn't "brick it"

This guide helped -
Recovering Catalyst Fixed Configuration Switches from a Corrupted or Missing Image - Cisco Systems

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Comments

CodeBlox

Took me a few HOURS to transfer a file that was only a few megabytes in size using XModem... Did the same transfer using TFTP and the IOS was transferred in seconds.

JeanM

CodeBlox wrote: »

Took me a few HOURS to transfer a file that was only a few megabytes in size using XModem... Did the same transfer using TFTP and the IOS was transferred in seconds.

Nice! I am going to need to set tftp up and see how that works next

Can still be done even when flash is empty yes?

jibbajabba

CodeBlox wrote: »

Took me a few HOURS to transfer a file that was only a few megabytes in size using XModem... Did the same transfer using TFTP and the IOS was transferred in seconds.

If you are lucky and have tftp access... I think switches like the 3750 series don't have romom with a tftp client so XModem is your only way of doing that...

control

CodeBlox wrote: »

Took me a few HOURS to transfer a file that was only a few megabytes in size using XModem... Did the same transfer using TFTP and the IOS was transferred in seconds.

Is it possible then to get an ip address on the switch/router from rommon to use tftp when the flash image has become corrupt?

jibbajabba

control wrote: »

Is it possible then to get an ip address on the switch/router from rommon to use tftp when the flash image has become corrupt?

rommon 11 > IP_ADDRESS=192.168.1.5
rommon 12 > IP_SUBNET_MASK=255.255.255.0
rommon 13 > DEFAULT_GATEWAY=192.168.1.1
rommon 14 > TFTP_SERVER=192.168.1.10
rommon 15 > TFTP_FILE=c1841-advipservicesk9-mz.124-13a.bin
rommon 16 > tftpdnld

JeanM

Nice! I'll deff need to blow it away again and try tftp

Now, the newer devices also can just use CF cards right?

VAHokie56

I did that on a production switch while trying to upgrade once when I was new to the game , luckily it was during the sites off hours

cb3dwa

ive seen this done in a maintenance window of 2 hours

gladly I was just an observer 