The problem was the loader. The 3725’s flash was corrupted—bad blocks from a near-miss artillery strike that had thrown shrapnel through the rack. The usual copy tftp flash would fail at 64%. He’d tried three times. Each time, the router would reboot into ROMmon, its console spewing: loadprog: bad file magic number .
Sergei slumped against the concrete wall. The router’s interfaces blinked one by one: FastEthernet0/0 up, Serial1/0 up, routing table rebuilding. BGP neighbors re-established. OSPF flooded the area with fresh LSA hellos. C3725-adventerprisek9-mz.124-15.t5.bin Download
How to Download and Use c3725-adventerprisek9-mz.124-15.t5.bin The problem was the loader
: 12.4(15)T5, belonging to the "Technology" (T) release train, which introduces newer features compared to the Mainline train. Resource Requirements : He’d tried three times
Ensure the router shows IOS (tm) 3725 Software (C3725-ADVENTERPRISEK9-M), Version 12.4(15)T5, RELEASE SOFTWARE .
Timeout. Retry?