做网站辛苦吗营销方式和渠道
效果图:R1 ping 通 R8 环回
R4的bgp路由表中5.5.5.5通过修改起源属性,下一跳R7变为R2,
即原本走下面R4-R7-R6-R5,改成R4-R3-R2-R5
R5效果图和R4类似(不放了)，R5的bgp路由表中4.4.4.4下一跳从R2优先改为R7优先(即原本走上面路R4-R3-R2-R5,改成下面路R4-R7-R6-R5),通过修改preferred-value 值为1来修改优先级达成效果
最终R4 ping R5走下面,猜测是2个同时改会冲突,此实验写2个是为了说明可以用这两种方法改路,
修改MED值是AS1来干涉AS2对AS1的选路,是别人对我的选路,用于ebgp之间,此处R2和R5之间本质还是ibgp关系,此处不可用
代码如下: #省略了接口ip代码和R2-R7的ospf的基础配置
[r1]
bgp 100
router-id 1.1.1.1
peer 12.1.1.2 as-number 200
network 1.0.0.0
network 1.1.1.1 32 #在bgp内宣告r1环回
[r2]
bgp 64512
router-id 2.2.2.2
confederation id 200 #宣布自己属于大AS200
confederation peer-as 64513 #这个要先于下面指令
peer 3.3.3.3 as-number 64512
peer 3.3.3.3 connect-interface LoopBack0
peer 5.5.5.5 as-number 64513
peer 5.5.5.5 ebgp-max-hop 255 #以环回为邻居,要加ebgp多跳
peer 5.5.5.5 connect-interface LoopBack0
peer 12.1.1.1 as-number 100
import-route direct #要宣告直连链路,否则12.1.1.0/24网段不会共享出去
import-route ospf 1 #重发布
peer 3.3.3.3 next-hop-local #优化R4ibgp下一跳问题
[r3]
bgp 64512
router-id 3.3.3.3
confederation id 200
peer 2.2.2.2 as-number 64512
peer 2.2.2.2 connect-interface LoopBack0
peer 4.4.4.4 as-number 64512
peer 4.4.4.4 connect-interface LoopBack0
peer 2.2.2.2 reflect-client #做反射器,解决ibgp水平分割问题
peer 4.4.4.4 reflect-client
[r4]
bgp 64512
router-id 4.4.4.4
confederation id 200
confederation peer-as 64513
peer 3.3.3.3 as-number 64512
peer 3.3.3.3 connect-interface LoopBack0
peer 7.7.7.7 as-number 64513
peer 7.7.7.7 ebgp-max-hop 255
peer 7.7.7.7 connect-interface LoopBack0
peer 3.3.3.3 route-policy yy import #入口符合yy的修改
peer 3.3.3.3 next-hop-local
ip ip-prefix xx permit 5.5.5.5 #抓取R5
route-policy yy permit node 10
if-match ip-prefix xx
apply origin igp #修改起源属性为igp
route-policy yy permit node 20 #要建立空表放其他ip走
[r5]
bgp 64513
router-id 5.5.5.5
confederation id 200
confederation peer-as 64512
peer 2.2.2.2 as-number 64512
peer 2.2.2.2 ebgp-max-hop 255
peer 2.2.2.2 connect-interface LoopBack0
peer 6.6.6.6 as-number 64513
peer 6.6.6.6 connect-interface LoopBack0
peer 6.6.6.6 next-hop-local
peer 6.6.6.6 preferred-value 1
[r6]
bgp 64513
router-id 6.6.6.6
confederation id 200
peer 5.5.5.5 as-number 64513
peer 5.5.5.5 connect-interface LoopBack0
peer 7.7.7.7 as-number 64513
peer 7.7.7.7 connect-interface LoopBack0
peer 5.5.5.5 reflect-client
peer 7.7.7.7 reflect-client
[r7]
bgp 64513
router-id 7.7.7.7
confederation id 200
confederation peer-as 64512
peer 4.4.4.4 as-number 64512
peer 4.4.4.4 ebgp-max-hop 255
peer 4.4.4.4 connect-interface LoopBack0
peer 6.6.6.6 as-number 64513
peer 6.6.6.6 connect-interface LoopBack0
peer 78.1.1.2 as-number 300
import-route direct
import-route ospf 1
peer 6.6.6.6 next-hop-local
[r8]
bgp 300
router-id 8.8.8.8
peer 78.1.1.1 as-number 200
network 8.8.8.8 255.255.255.255