Router# configure terminal Router(config)# boot system flash:c3640-jk9s-mz.124-16.bin Router(config)# config-register 0x2102 Router(config)# exit Router# write memory
| Component | Meaning | |-----------|---------| | | Platform: Cisco 3640 series modular router | | j | Enterprise feature set (includes IP routing, QoS, security, and VPN) | | k9s | Strong Crypto (3DES, AES, SSH, SSL). The s indicates “strong” encryption—until export restrictions changed, images with k9 or k9s were restricted. | | mz | Memory location: m = runs from RAM; z = compressed image (the router decompresses it at boot) | | 124-16 | IOS version: 12.4(16) – a mature release from the 12.4 mainline train | | .bin | Binary executable file format – the actual OS image | c3640-jk9s-mz.124-16.bin
OSPF adjacency flapping Cause: Common in older 12.4 builds if mismatched MTU Fix: Set ip ospf mtu-ignore on interfaces temporarily, then fix MTU mismatch. then fix MTU mismatch.
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