CISCO7600和6500系列密码恢复

    与大多数思科路由器相似，6500和7600系列路由器密码恢复都可以在rommon模式下进行。

    特别注意：Sup720、Sup32和RSP720等都有两个处理器，即SP（Switch Processor）和RP（Router Processor）。

    开机或重启，过程中会看到如下信息，表明进入RP处理：

      00:00:28: %OIR-SP-6-CONSOLE: Changing console ownership to route processor

      此时，按住 Ctrl+Break，而不是SP开始时（如果是，那你进入的是SP的rommon，而不是RP的rommon）。在ROMMON模式下，输入0x2142，然后reset，重启即可。剩余操作同其它路由器相同。

      备注：

     Configuration Registers

      The global configuration command - config-register is used to modify the behaviour of the router. Weather or not it boots from saved configuration. Weather or not it boots from the flash or the boot-proms.

      In summary these Boot Registers are quite handy:

• The value range is from 0x0 to 0xFFFF.
• 0x2102 is the factory-default configuration register value.
• 0x2142 boots from flash without using NVRAM contents good for password recovery.
• 0x2101 boots from boot prom image not flash, good for upgrading image on flash.
• 0x2141 boots from boot prom and ignores NVRAM contents.
• 0x141, which disables the Break key, ignores the NVRAM configuration, and
  boots the default system image from ROM.