MP-BGP配置实战：实现IPv6路由交换

MP-BGP配置实战：实现IPv6路由交换

引用

CSDN

1.

https://blog.csdn.net/pt1043/article/details/145534656

本文通过一个实验拓扑，详细介绍了如何在Cisco路由器上配置MP-BGP（多协议边界网关协议）以支持IPv6路由的交换。文章通过具体的配置命令和实验步骤，展示了如何在四台路由器（R1、R2、R3和R4）之间建立BGP邻居关系，并通过路由反射器实现路由信息的高效传播。

实验拓扑

实验采用简化的全互联拓扑结构，其中R1和R3与R2建立iBGP邻居关系，R2作为路由反射器，R3与R4建立eBGP邻居关系。这种结构既简化了配置，又保证了路由信息的完整传播。

配置步骤

R1配置

hostname R1
!
ipv6 unicast-routing
!
interface Loopback0
 ipv6 address 2000:1111::1/128
 ipv6 eigrp 10
!
interface Ethernet0/0
 no sh
 ipv6 address 2025:DB8:0:12::1/64
 ipv6 eigrp 10
!
ipv6 router eigrp 10
 eigrp router-id 1.1.1.1
!
router bgp 123
 bgp router-id 1.1.1.1
 no bgp default ipv4-unicast
 neighbor 2000:2222::2 remote-as 123
 neighbor 2000:2222::2 update-source Loopback0
 !
 address-family ipv6
  network 2000:1111::1/128
  neighbor 2000:2222::2 activate
 exit-address-family
!
end  

R2配置

hostname R2
!
ipv6 unicast-routing
!
interface Loopback0
 ipv6 address 2000:2222::2/128
 ipv6 eigrp 10
!
interface Ethernet0/0
 no sh
 ipv6 address 2025:DB8:0:12::2/64
 ipv6 eigrp 10
!
interface Ethernet0/1
 no sh
 ipv6 address 2025:DB8:1:23::2/64
 ipv6 eigrp 10
!
ipv6 router eigrp 10
 eigrp router-id 2.2.2.2
!
router bgp 123
 bgp router-id 2.2.2.2
 bgp listen range 2000::/16 peer-group IBGPV6
 no bgp default ipv4-unicast
 neighbor IBGPV6 peer-group
 neighbor IBGPV6 remote-as 123
 neighbor IBGPV6 update-source Loopback0
 !
 address-family ipv6
  neighbor IBGPV6 activate
  neighbor IBGPV6 route-reflector-client
 exit-address-family
!
end  

R3配置

hostname R3
!
ipv6 unicast-routing
!
interface Loopback0
 ipv6 address 2000:3333::3/128
 ipv6 eigrp 10
!
interface Ethernet0/0
 no sh
 ipv6 address 2025:DB8:1:23::3/64
 ipv6 eigrp 10
!
interface Ethernet0/1
 no sh
 ipv6 address 2025:DB8:2:34::3/64
 ipv6 eigrp 10
!
ipv6 router eigrp 10
 eigrp router-id 3.3.3.3
!
router bgp 123
 bgp router-id 3.3.3.3
 no bgp default ipv4-unicast
 neighbor 2000:2222::2 remote-as 123
 neighbor 2000:2222::2 update-source Loopback0
 neighbor 2025:DB8:2:34::4 remote-as 444
 !
 address-family ipv6
  neighbor 2000:2222::2 activate
  neighbor 2000:2222::2 next-hop-self
  neighbor 2025:DB8:2:34::4 activate
 exit-address-family
!
end  

R4配置

hostname R4
!
ipv6 unicast-routing
!
interface Loopback0
 ipv6 address 2000:4444::4/128
!
interface Ethernet0/0
 no sh
 ipv6 address 2025:DB8:2:34::4/64
!
route-map CONN permit 10
 match interface Loopback0
!
router bgp 444
 bgp router-id 4.4.4.4
 no bgp default ipv4-unicast
 neighbor 2025:DB8:2:34::3 remote-as 123
 !
 address-family ipv6
  redistribute connected route-map CONN
  neighbor 2025:DB8:2:34::3 activate
 exit-address-family
!
end  

实验验证

查看R3的TCP连接摘要信息，可以看到BGP路由器ID、本地ASN以及BGP表占用的内存大小。通过R2的路由反射器，R1发布的网络信息也能被R3接收。

查看R3和R4的BGP表，以及依次查看R1到R4的BGP路由表，可以验证配置的正确性。测试远端连通性，确认IPv6路由的可达性。

总结

MP-BGP对IPv6的支持与IPv4类似，使用相同的179端口建立TCP连接。在iBGP邻居过多的情况下，可以使用BGP联邦或BGP联邦结合路由反射器来优化配置。这种配置方案在实际网络工程中具有广泛的应用价值。