BGP配置中Weight选路的示例分析

今天就跟大家聊聊有关BGP配置中Weight选路的示例分析，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。1、BGP公认必遵属性:as-path、next-hop、originorigin: i表示IBGP通过network命令发布的路由e表示EGP重发布进来的路由？表示从IGP重分布或静态路由2、BGP存在多跳最优路由时的选路依据3、Weight选路解析修改weight值的方法：方法一：全部修改邻居传过来的路由的weight值，例如：router bgp 4neighbor 1.1.1.1 weight 1
方法二：部分修改邻居传过来的路由的weight值，例如：ip prefix-list 1 permit 33.33.33.0/24route-map W permit 10match ip address prefix-list 1set weight 1route-map W permit 20router bgp 4neighbor 1.1.1.1 route-map W in4、实验拓扑5、基础配置R1配置
interface Loopback0ip address 1.1.1.1 255.255.255.0interface Serial0/0ip address 13.1.1.1 255.255.255.0interface Serial0/1ip address 14.1.1.1 255.255.255.0router ospf 110router-id 1.1.1.1log-adjacency-changesnetwork 1.1.1.0 0.0.0.255 area 0network 14.1.1.0 0.0.0.255 area 0router bgp 4no synchronizationbgp router-id 1.1.1.1neighbor 4.4.4.4 remote-as 4neighbor 4.4.4.4 update-source Loopback0neighbor 4.4.4.4 next-hop-selfneighbor 13.1.1.3 remote-as 3no auto-summaryR2配置interface Loopback0ip address 2.2.2.2 255.255.255.0interface Serial0/1ip address 23.1.1.2 255.255.255.0interface FastEthernet1/0ip address 24.1.1.2 255.255.255.0router ospf 110router-id 2.2.2.2network 2.2.2.0 0.0.0.255 area 0network 24.1.1.0 0.0.0.255 area 0router bgp 4no synchronizationbgp router-id 2.2.2.2neighbor 4.4.4.4 remote-as 4neighbor 4.4.4.4 update-source Loopback0neighbor 4.4.4.4 next-hop-selfneig免费云主机域名hbor 23.1.1.3 remote-as 3no auto-summaryR3配置interface Loopback0ip address 3.3.3.3 255.255.255.0interface Loopback1ip address 33.33.33.33 255.255.255.0 interface Serial0/0ip address 13.1.1.3 255.255.255.0interface Serial0/1ip address 23.1.1.3 255.255.255.0router bgp 3no synchronizationbgp router-id 3.3.3.3network 3.3.3.0 mask 255.255.255.0network 33.33.33.0 mask 255.255.255.0neighbor 13.1.1.1 remote-as 4neighbor 23.1.1.2 remote-as 4no auto-summaryR4配置interface Loopback0ip address 4.4.4.4 255.255.255.0interface Serial0/1ip address 14.1.1.4 255.255.255.0interface FastEthernet1/0ip address 24.1.1.4 255.255.255.0router ospf 110router-id 4.4.4.4network 4.4.4.0 0.0.0.255 area 0network 14.1.1.0 0.0.0.255 area 0network 24.1.1.0 0.0.0.255 area 0router bgp 4no synchronizationbgp router-id 4.4.4.4neighbor 1.1.1.1 remote-as 4neighbor 1.1.1.1 update-source Loopback0neighbor 2.2.2.2 remote-as 4neighbor 2.2.2.2 update-source Loopback0no auto-summary6、默认选路根据BGP选路原则第八条可以知道，R4到达3.3.3.0/24、33.33.33.0/24都是经过R2。7、全部修改邻居传过来的路由的weight值由前面可以R4到达3.3.3.0/24、33.33.33.0/24都是经过R2，我们通过修改Weight值将R4到达3.3.3.0/24、33.33.33.0/24都是经过R1。R4配置router bgp 4neighbor 1.1.1.1 weight 18、部分修改邻居传过来的路由的weight值R4到达3.3.3.0/24、33.33.33.0/24都是经过R2，我们通过修改Weight值将R4到达3.3.3.0/24经过R2、达到33.33.33.0/24都是经过R1。R4配置ip prefix-list 1 seq 5 permit 33.33.33.0/24route-map W permit 10match ip address prefix-list 1set weight 1route-map W permit 20router bgp 4neighbor 1.1.1.1 route-map W in看完上述内容，你们对BGP配置中Weight选路的示例分析有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注云编程开发博客行业资讯频道，感谢大家的支持。

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