xxygq 发表于 2012-10-13 12:43 static/image/common/back.gif
第一个：AD
这个题题库是正确的。cisco 官网对variance的解释就是大于等于。
http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfeigrp.html#wp1024988
当然要相信官方，做个实验就都清楚了：
R1# sh run
Building configuration...
Current configuration : 1107 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
ip domain name lab.local
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Serial0/0
ip address 12.1.1.1 255.255.255.0
serial restart-delay 0
!
interface Serial0/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/3
no ip address
shutdown
serial restart-delay 0
!
interface FastEthernet1/0
bandwidth 3346
ip address 120.1.1.1 255.255.255.0
delay 1000
duplex auto
speed auto
!
router eigrp 90
variance 2
network 0.0.0.0
no auto-summary
!
no ip http server
no ip http secure-server
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
!
end
要相信事实！这是一门需要实践的课程。我在c3725-advipservicesk9-mz.124-15.T14.bin的平台上验证过，当与variance后面的因子相乘后等于备选路径的度量值的情况下也是可以写入路由表的。所以文档说的“等于或小于”是正确的。
{:6_267:}{:6_267:}
