43、BGP配置实验之聚合aggregate-address

前端之家收集整理的这篇文章主要介绍了43、BGP配置实验之聚合aggregate-address前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

1、实验拓扑

wKiom1Zn4ITi1bjlAABRU7KI2x0837.png

2、基础配置

R1配置

interface Loopback0

ip address 1.1.1.1 255.255.255.0

interface Serial0/0

ip address 13.1.1.1 255.255.255.0

interface FastEthernet1/0

ip address 124.1.1.1 255.255.255.0

router ospf 110

log-adjacency-changes

network 1.1.1.0 0.0.0.255 area 0

network 124.1.1.0 0.0.0.255 area 0

router bgp 1

no synchronization

bgp router-id 1.1.1.1

neighbor 2.2.2.2 remote-as 1

neighbor 2.2.2.2 update-source Loopback0

neighbor 2.2.2.2 next-hop-self

neighbor 13.1.1.3 remote-as 3

no auto-summary


R2配置

interface Loopback0

ip address 2.2.2.2 255.255.255.0

interface FastEthernet1/0

ip address 124.1.1.2 255.255.255.0

router ospf 110

log-adjacency-changes

network 2.2.2.0 0.0.0.255 area 0

network 124.1.1.0 0.0.0.255 area 0

router bgp 1

no synchronization

bgp router-id 2.2.2.2

bgp log-neighbor-changes

neighbor 1.1.1.1 remote-as 1

neighbor 1.1.1.1 update-source Loopback0

neighbor 124.1.1.4 remote-as 4

no auto-summary


R3配置

interface Loopback0

ip address 3.3.3.3 255.255.255.0

interface Loopback16

ip address 202.1.16.3 255.255.255.0

interface Loopback17

ip address 202.1.17.3 255.255.255.0

interface Loopback18

ip address 202.1.18.3 255.255.255.0

interface Loopback19

ip address 202.1.19.3 255.255.255.0

interface Serial0/0

ip address 13.1.1.3 255.255.255.0

router bgp 3

no synchronization

bgp router-id 3.3.3.3

bgp log-neighbor-changes

network 3.3.3.0 mask 255.255.255.0

network 202.1.16.0

network 202.1.17.0

network 202.1.18.0

network 202.1.19.0

neighbor 13.1.1.1 remote-as 1

no auto-summary


R4配置

interface Loopback0

ip address 4.4.4.4 255.255.255.0

interface FastEthernet1/0

ip address 124.1.1.4 255.255.255.0

router bgp 4

no synchronization

bgp router-id 4.4.4.4

bgp log-neighbor-changes

network 4.4.4.0 mask 255.255.255.0

neighbor 124.1.1.2 remote-as 1

no auto-summary


3、配置聚合

BGP聚合可以使用两种方法

方法一:手动写一条指向空接口的静态汇总路由,再在BGP路由进程汇总发布该汇总路由

方法二:先在BGP路由进程中network所有的明细路由,在用aggregate-address 202.1.16.0 255.255.252.0 做聚合,此时会将聚合路由和明细路由都通告出去,aggregate-address 202.1.16.0 255.255.252.0 summary-only将会抑制明细路由,标识为s,且不发给其他BGP邻居。

此外我们也可以指定不通告特定路由,基本步骤如下:

ip prefix-list 1 permit 202.1.16.0/23 ge 24 le 24


route-map YZ permit 10

match ip address prefix-list 1


router bgp 3

aggregate-address 202.1.16.0 255.255.252.0 suppress-map YZ


方法二是在发送方做聚合,如果在接收方做聚合,接收方生成聚合路由后会反传给发送方,此时将会产生丢包现象,所以不应该让聚合路由回传。为达到不会传的目的,我们采用BGP的水平分割技术,在聚合路由上加入明细路由的属性,这样当发送方收到聚合路由后,由于聚合路由携带有自身的AS号而不接受该路由,aggregate-address 202.1.16.0 255.255.252.0 summary-only as-set。

方法一:

R3配置

ip route 202.1.16.0 255.255.252.0 null0

router bgp 3

no network 202.1.16.0

no network 202.1.17.0

no network 202.1.18.0

no network 202.1.19.0

network 202.1.16.0 mask 255.255.252.0


方法二:

R3配置

noip route 202.1.16.0 255.255.252.0 null0

router bgp 3

nonetwork 202.1.16.0 mask 255.255.252.0

network 202.1.16.0

network 202.1.17.0

network 202.1.18.0

network 202.1.19.0

aggregate-address 202.1.16.0 255.255.252.0

wKiom1Zn7e3iLqYvAABmkwwmUQ4727.png

aggregate-address 202.1.16.0 255.255.252.0 summary-only将会抑制明细路由,标识为s,且不发给其他BGP邻居。

router bgp 3

aggregate-address 202.1.16.0 255.255.252.0 summary-only

wKioL1Zn7vmTCdHIAABVKzKtzzM490.png

wKiom1Zn7vGSSeHmAAA_SpApRKk160.png

wKioL1Zn76KRGKHQAAAxpGfqIGE293.png


清除R3上的聚合,将聚合做在R1上。

router bgp 3

no aggregate-address 202.1.16.0 255.255.252.0 summary-only


router bgp 1

no aggregate-address 202.1.16.0 255.255.252.0 summary-only

wKioL1Zn8PuTRZcwAABmm9k5UO8909.png

wKioL1Zn8YvSJb94AAA4RKB81-U512.png

router bgp 1

no aggregate-address 202.1.16.0 255.255.252.0 summary-only as-set

wKioL1Zn8b_gbEhlAABe0F8gmO0914.png

wKioL1Zn8cCgRbGHAAAwe5FANOA780.png

R1不再将聚合路由通告给R3。

原文链接:https://www.f2er.com/javaschema/284270.html

猜你在找的设计模式相关文章