cisco packet tracer 8.2.2的ripv2协议是不支持认证了？
执行指令，甚至都不认识ip rip的指令了，不太明白
Router(config-if)#ip?
ip ipv6
Router(config-if)#ip ?
access-group Specify access control for packets
address Set the IP address of an interface
authentication authentication subcommands
flow NetFlow Related commands
hello-interval Configures IP-EIGRP hello interval
helper-address Specify a destination address for UDP broadcasts
mtu Set IP Maximum Transmission Unit
nat NAT interface commands
ospf OSPF interface commands
proxy-arp Enable proxy ARP
split-horizon Perform split horizon
summary-address Perform address summarization
Router(config-if)#ip au
Router(config-if)#ip authentication k
Router(config-if)#ip authentication key-chain tao
^
% Invalid input detected at '^' marker.
Router(config-if)#ip r?
% Unrecognized command
Router(config-if)#ip rip?
% Unrecognized command
Router(config-if)#ip rip
