就像这样，在敲class-map时就直接跳出去了
R1(config-if)#
R1(config-if)#
R1(config-if)#
R1#
*Mar 1 00:18:22.395: %SYS-5-CONFIG_I: Configured from console by console
R1#
R1#
R1#
R1#
R1(config-if)#
R1(config-if)#
R1(config-if)#
R1#
*Mar 1 00:18:22.395: %SYS-5-CONFIG_I: Configured from console by console
R1#
R1#
R1#
R1#
