I am planning to upgrade the IOS on a 7206VXR(npe-400). Is it necessary to upgrade the boot image on bootflash? I read the following on cisco's website-"Unless you installed new port adapters in the router shelf, do not upgrade the boot image." Does this mean that I should keep the same boot image on the router even though it is not the same version as the new image I will be putting on disk0? When is it necessary to upgrade the boot image and in which order should you upgrade, boot image first and then disk0 or vice versa?
Current boot statements on the router:
boot system flash disk0:c7200-js-mz.123-9a.bin
boot bootldr bootflash:c7200-kboot-mz.123-9a.bin