1. stub 阻止路由器发不必要的query, 当一个router被设置成stub后, 其他路由器就不会给他发query了. 可以设置宣告哪些路由(connected, redistributed

is up Internet Address 10.1.1.1/24, Area 0 Process ID 20, Router ID 10.1.2.1, Network Type BROADCAST, Cost: 64Transmit Delay is 1 sec, State DR

PC(10.0.0.1、网关10.0.0.254)（e0/0:10.0.0.254）ROUTER3620(lo0:172.16.0.1)IOS版本c3620ik9o3s

Router:samiam(VPN Server)Current configuration:!version 12.2service timestamps debug uptime service

(1)在本端看邻居。Router1#sh ip os neiNeighbor ID Pri Statenbs p; Dead Time Address Interface2.2.2.2 0

router2509 ! boot system flash enable secret 5 $1$Sna4$w1TBkzMxplA2DtxNAFnSy/ enable password lz

flash: device is READONLY？ 答：因为此时2511是从Flash启动的，可用以下命令改变启动方式： conf t configregister 0x101 Ro uter# reload Router(boot)#copy tftp flash.

IP sec的VPN配置 左边的router： crypto isakmp policy 1 hash md5 authentication preshare crypto isakmp key

service timestamps log uptime no service passwordencryption ! hostname Router ! aaa

255.255.255.0!interface Serial2/0ip address 20.20.20.1 255.255.255.0!router ospf 1! OSPF