关于eigrp汇总的一道题.doc

Ccie的一道题： 答案是A，是因为eigrp只有在主干网络外的边缘网络才会自动汇总。 R1 R1(config-router)#do sh run Building configuration... Current configuration : 779 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! interface Loopback1 ip address ! interface FastEthernet0/0 ip address duplex auto speed auto ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! router eigrp 1 network 55 network 55 No auto-summary ! no ip http server no ip http secure-server ! ! control-plane ! ! line con 0 exec-timeout 0 0 logging synchronous line aux 0 line vty 0 4 ! ! End R1(config-router)#do sh ip rou Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set /24 is subnetted, 1 subnets C is directly connected, Loopback1 /24 is subnetted, 2 subnets D [90/30720] via , 00:23:23, FastEthernet0/0 C is directly connected, FastEthernet0/0 R2 R2(config-router)#do sh run Building configuration... Current configuration : 689 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R2 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! interface FastEthernet0/0 ip address duplex auto speed auto ! interface FastEthernet1/0 ip address duplex auto speed