conf t boot system flash c2800nm-adventerprisek9-mz.152-1.full config-register 0x2102 end
: Robust support for large-scale enterprise routing. c2800nm adventerprisek9 mz 152 1 full
Upgrading to IOS 15.x on older 2800 hardware requires significant memory upgrades. While these routers often shipped with 256MB of RAM, version 15.2 demands more overhead: conf t boot system flash c2800nm-adventerprisek9-mz