有关OSPF的RID问题(TK75 P111 Q26)

快乐孤儿

<P>You wish to ensure that router TK2 will be preferred as the designated router (DR)<BR>for the 172.16.1.0 /24 LAN segment.<BR>What configuration tasks could be used to establish this preference? (Choose all<BR>that apply)<BR>A. Configure the priority value of the Fa0/0 interface of RouterTK2 to a higher value<BR>than any other interface on the Ethernet network.<BR>B. Change the router id for Router TK2 by assigning the IP address 172.16.1.130/24<BR>to the Fa0/0 interface of RouterTK2.<BR>C. Configure a loopback interface on RouterTK2 with an IP address higher than any<BR>IP address on the other routers.<BR>D. Change the priority value of the Fa0/0 interface of RouterTK2 to zero.<BR>E. Change the priority values of the Fa0/0 interfaces of RouterTK1 and RouterTK3<BR>to zero.<BR>F. No further configuration is necessary.<BR>G. All of the above will make TK2 the DR</P><P>&nbsp;</P><P>这道题应该选什么呢?</P><IMG src="http://www.spoto.com.cn/bbs/images/upfile/2005-8/2005824181146.jpg">

王晓强

<P>OSPF选DR的问题。答案ACE。选DR原则：（1）ip ospf priority value 优先级最高的将成为DR，选项A。（2）默认情况下优先级都是1,选最高RID的路由器为DR，RID的选择是以最高逻辑地址（loopback）然后以最高物理地址来选择，选项C。（3）优先级被设置成0以后就不能参加DR的选择，默认的优先级1就最高了，选项E。F选项也是对的！</P><p>［此帖子已被 andersen 在 2005-8-27 12:39:53 编辑过］

快乐孤儿

<P>题目中没讲任何有关原来网络中优先级的配置,那么是不是就可以当做没有修改优先级?使用默认的优先级?</P><P>&nbsp;</P>