如下图所示，某校园网用1OGbps的POS技术与Internet相连，POS接口的帧格式是SDH。路由协议的选择方案

问题：

请阅读以下R3和R1的部分配置信息，并补充下列空白处的配置命令或参数，按题目要求完成路由器的配置。

R3的POS接口、OSPF和缺省路由的配置信息如下：

Router-R3configure terminal

Router-R3(config)interface pos4／0

Router-R3(config-if)description To Intemet

Router-R3(config-if)bandwidth 10000000

Router-R3(config-if)ip address 21 1．68．69．170 255．255．255．252

Router-R3(config-if)【6】32

Router-R3(config-if)pos framing sdh

Router-R3(config-if)no ip directed—broadcast

Router-R3(config-if)pos flag sl sO 2

Router-R3(config-if)no shutdown

Router-R3(config-if)exit

Router-R3(config)router ospf 63

Router-R3(config-router)network【7】area 0

Router-R3(config-router)redistribute connected metric-type 1 subnets

Router-R3(config-router)area o range 【8】

Router-R3(config-router)exit

Router-R3(config)ip route 0．0．0．0 0．0．0．0 211．68．69．169

Router-R3(config)exit

Router-R3

R1的DHCP的部分配置信息如下：

Router-Rlconfigure terminal

Router-Rl(config)ip dhcp【9】221．89．23．200 221．89．23．254

Router-R1(eonfig)ip dhcp pool bupt

Router-R1(dhep-config)network 221．89．23．192 255．255．255．192

Router-R1(dhcp-config)default-router 221．89．23．193

Router-R1(dhcp-config)domain-nanle bupt．edu．cn

Router-R1(dhcp-config)dns-server address 221．89．24．27 221．89．24．26

Router-R1(dhcp-config)lease 【10】

Router-R1(dhcp-config)exit

Router-R1(config)exit

Router-R1