CISCO router troubleshooting (Verified Results) each interval between the router prompt: % SYS-2-CHUNKBADMAGIC: Bad magic number in chunk header, www.2cto.com on the CISCO official website to query the solution, the official solution is: contact your local technical support... (Purely bullshit ). Later, I saw someone encountering the same problem on a foreigner's Forum and posted the following post: ========================================================== ======================================== Hi, does anyone know this is a bug? Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.3 (14) T2 % SYS-2-CHUNKBADMAGIC: Bad magic number in chunk header, chunk 0 data 66AFCEE0 chunkmagic 6093EE60 chunk_freemagic 65B248F0-Process = "<interrupt level> ", ipl = 4-Traceback = 0x60941AE0 0x6086C988 0x60190674 0x6019155C 0x60189700 0x609FF67C 0x6090EA14 ================== ========================================================== ============ = The problem is the same as the fault prompt of the router in my house .. Someone replies: it's because of the fragmentation and VFR enabled on the router. try the workaround. disable VFR on all interfaces (no ip virtual-reassembly "), or just on these where the command" show ip virtual-reassembly "shows you reassembly count> 0 probably means: run the show ip virtual-reassembly command to check which ports have the virtual-reassembly function enabled, and run the no ip virtual-reassembly command in interface mode to disable it.