路由器A的配置如下: Quidway#SHOW RUN Now create configuration... Current configuration ! ! interface Ethernet0 ip address 10.1.1.1 255.255.0.0 ip ospf enable area 0.0.0.1 ! interface Serial0 clock-select DTECLK1 encapsulation ppp ip address 2.1.1.1 255.0.0.0 ip ospf enable area 0.0.0.1 ! interface Serial1 encapsulation ppp ! interface Serial2 flowcontrol normal async mode dedicated encapsulation ppp ! exit router ospf enable ! end 路由器B配置如下 Quidway#SHOW RUN Now create configuration... Current configuration ! ! interface Ethernet0 ip address 10.2.1.1 255.255.0.0 ip ospf enable area 0.0.0.2 ! interface Serial0 encapsulation ppp ip address 2.1.1.2 255.0.0.0 ip ospf enable area 0.0.0.2 ! interface Serial1 encapsulation ppp ! interface Serial2 flowcontrol normal async mode dedicated encapsulation ppp ! exit router ospf enable ! End 如下说法正确的是