通过控制台口和AUX端口来加载IOS

    Router1#copy xmodem: slot1:

    **** WARNING ****

    x/ymodem is a slow transfer protocol limited to the current speed

    settings of the auxiliary/console ports. The use of the auxilary

    port for this download is strongly recommended.

    During the course of the download no exec input/output will be

    available.

                                                  ---- ******* ----

    Proceed? [confirm] <enter>

    Destination filename []? c3620-ik9s-mz.122-12a.bin

    Erase slot1: before copying? [confirm] <enter>

    Use crc block checksumming? [confirm] <enter>

    Max Retry Count [10]: <enter>

    Perform image validation checks? [confirm] <enter>

    Xmodem download using crc checksumming with image validation

    Continue? [confirm]    <enter>

    Ready to receive file...........CC    <start xmodem file transfer here>

    4294967295 bytes copied in 1450.848 secs (1271445669961 bytes/sec)

    Router1#

    注释  思科建议使用AUX口进行此步骤，因为AUX口支持硬件流控。为了提高拷贝速度，建议提前

    使用下述命令来设置端口速度

    Router1#configure terminal

    Enter configuration commands, one per line.    End with CNTL/Z.

    Router1(config)#line aux 0

    Router1(config-line)#speed 115200

    Router1(config-line)#end

    Router1#