MPLS跨域 Option B

原创已于 2023-10-30 10:49:10 修改 · 432 阅读

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于 2021-12-01 12:09:28 首次发布

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本文档展示了MPLS VPN的配置示例，重点在于AS边界路由器（ASBR）的角色。当大量VPN路由通过ASBR传递时，可能会导致ASBR负担过重，成为潜在的故障点。配置中涉及了BGP、OSPF和VPNV4的交互，以及PE和ASBR之间的连接，旨在实现跨域的路由信息交换。然而，这种配置并未考虑ASBR之间的互联链路数目的限制，可能影响系统的稳定性和可靠性。

不受ASBR之间互联链路数目的限制

VPN路由信息通过AS之间的ASBR保存和扩散的，当VPN路由较多时，ASBR负担重，容易成为故障点

基本配置同OptionA一样

PE1:
ip vpn-instance 1
 ipv4-family
  route-distinguisher 1:1
  vpn-target 100:200 export-extcommunity
  vpn-target 100:100 import-extcommunity
interface GigabitEthernet0/0/0
 ip binding vpn-instance 1
bgp 100
 peer 3.3.3.3 as-number 100 
 peer 3.3.3.3 connect-interface LoopBack0
 #
 ipv4-family unicast
  undo synchronization
  peer 3.3.3.3 enable
 # 
 ipv4-family vpnv4
  policy vpn-target
  peer 3.3.3.3 enable
 #
 ipv4-family vpn-instance 1 
  import-route ospf 100

ospf 100 router-id 1.1.1.1 vpn-instance 1
 import-route bgp
 area 0.0.0.0 
  network 192.168.1.0 0.0.0.255 

ASBR1:
bgp 100
 peer 1.1.1.1 as-number 100 
 peer 1.1.1.1 connect-interface LoopBack0
 peer 34.1.1.4 as-number 200 
 #
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.1 enable
  peer 34.1.1.4 enable
 # 
 ipv4-family vpnv4
  undo policy vpn-target
  peer 1.1.1.1 enable
  peer 34.1.1.4 enable
#
interface GigabitEthernet0/0/1
 mpls


ASBR2:
bgp 200
 peer 6.6.6.6 as-number 200 
 peer 6.6.6.6 connect-interface LoopBack0
 peer 34.1.1.3 as-number 100 
 #
 ipv4-family unicast
  undo synchronization
  peer 6.6.6.6 enable
  peer 34.1.1.3 enable
 # 
 ipv4-family vpnv4
  undo policy vpn-target
  peer 6.6.6.6 enable
  peer 34.1.1.3 enable

interface GigabitEthernet0/0/1
 mpls

PE2:
ip vpn-instance 1
 ipv4-family
  route-distinguisher 2:2
  vpn-target 100:100 export-extcommunity
  vpn-target 100:200 import-extcommunity
#
bgp 200
 peer 4.4.4.4 as-number 200 
 peer 4.4.4.4 connect-interface LoopBack0
 #
 ipv4-family unicast
  undo synchronization
  peer 4.4.4.4 enable
 # 
 ipv4-family vpnv4
  policy vpn-target
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance 1 
  import-route ospf 100
#
ospf 100 router-id 6.6.6.6 vpn-instance 1
 import-route bgp
 area 0.0.0.0