lotusr5的专栏

 第一步：在全局配置模式下建立key chain   key chain cisco    key 1    key-string 123第二步：在接口下调用key chaininterface Serial 1   ip rip authentication key-chain cisco   ip rip authentication mode text/md5

之前：show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area        N1 - OSPF NSSA external type 1, N2