IOS image file format Question

[j1smith]

We have a Hybrid OS Cisco 6509 and MFSC2 . We are upgrading the bootflash image on the MFSC2 card and I have a choice between two images:

c6msfc2-jsv-mz.121-19.E1 size: 14,224 KB

or

c6msfc2-jsv-mz.121-19.E1.bin size 14,187 KB

As you can see the only difference between the filenames is the .bin extension. Also the files are different sizes.The current bootflash image does not have a .bin extension (c6msfc2-is-mz.121-2.E)

1) What is the diference denoted by the .bin extension?

2) Can I use the .bin file to upgrade our MFSC2 ?

[a.manosca]

Hi, based on experience, I believe it really doesn't matter if there's a .bin or not. Sometimes, the IOS are renamed when copying from a TFTP server to the switch. I have a copy of the IOS version that you have (c6msfc2-jsv-mz.121-19.E1), and the file size is exactly the same (14,224 KB). I would suggest you choose this file.

Hope this helps.

[j1smith]

Thanks! I'll let you know how it turns out.