实验拓朴:
实验配置:
R1
和
R2
基本
EBGP
邻居关系
实验现象:
1. R2 BGP
配置
default-in originate
R1#sh ip bgp
R2#sh ip bgp
R1
和
R2 Bgp
表里为空
.
2. R2 BGP
配置
default-in originate
,并配置静态路由
ip route 0.0.0 .0 0.0.0.0 s1/1
R1#sh ip bgp
R2#sh ip bgp
R2#sh ip route st
S* 0.0.0 .0/0 is directly connected, Serial1/1
R1
和
R2 Bgp
表里仍为空
.
3. R2
配置
ip route 0.0.0 .0 0.0.0.0 s1/1 ,
并在
BGP
中重分布静态路由
.
同
2
结果
4. R2 BGP
配置
default-in originate +
重分布静态
,并配置静态路由
ip route 0.0.0 .0 0.0.0.0 s1/1 .
R1#sh ip bgp
BGP table version is 2, local router ID is 1.1.1 .1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0 .0 10.1.12 .2 0 0 2 ?
R1#
R2#sh ip bgp
BGP table version is 2, local router ID is 2.2.2 .2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0 .0 0.0.0 .0 0 32768 ?
R3#
R1
和
R2 BGP
表里出现默认路由
0.0.0 .0 .
实验结论:
We have demonstrated that advertising a default route via BGP requires three steps:
Step 1. Create a static default route.
配置静态默认路由
Step 2. Redistribute static into BGP.
重分布静态进入BGP
Step 3. Use the BGP command default-information originate.
使用BGP default-information originate
命令