BGP solves routing black hole through MPLS

目录

The construction of the topology andIP地址的规划

IGP配置 

BGP配置 

MPLS配置 

BGPAnnouncement and routing 

实验要求：

The construction of the topology andIP地址的规划

First experiment requirementAS2Network segment address based on172.16.0.0/16划分,This segment is very big,We are free to draw,怎么舒服怎么来,But as far as possible to ensure the reasonable utilization,Reduce waste address.

According to the above complete topology structures, and the division of address

IGP配置 

先在AS2内部使用OSPF使AS2内部互通,View the routing table after the completion of,Ensure internal cut up to

BGP配置 

R1与R2、R5Built between adjacent,R2、R5、R7Between two adjacent building,R7与R8Build adjacent each other

Direct built adjacent

[R1]bgp 1

[R1-bgp] peer 12.1.1.2 as-number 2  （The other side of the physical interfaceIP及AS号）

环回接口建邻

[R2]bgp 2
[R2-bgp]peer 172.16.1.13 as-number 2
[R2-bgp]peer 172.16.1.13 connect-interface LoopBack 0
[R2-bgp]peer 172.16.1.13 next-hop-local 

According to the above operation is completed after configuration,Can view the neighbor table

R1 

R5

MPLS配置 

通过mpls Solve the control plane can reach inaccessible data level

[r2]mpls lsr-id 172.16.0.1

（必须先定义mpls的router-id,要为本地设备的真实ip地址,且邻居可达）

[r2]mpls             再开启mpls协议

[r2]mpls  ldp

[r2-mpls-ldp]q

 之后需要在所有标签经过的接口上开启协议

[r2]interface GigabitEthernet 0/0/1

[r2-GigabitEthernet0/0/1]mpls    先开启MPLS

[r2-GigabitEthernet0/0/1]mpls ldp   再激活LDP协议

AS2Each of the router configuration according to the operating neighbor relationship 

建立后可以通过“display  mpls ldp peer”查看邻居表

BGPAnnouncement and routing 

首先R1与R8Does not affect directly declare

[R1]bgp 1
[R1-bgp]ne
[R1-bgp]network 1.1.1.0 24

AS2The topic request：R1访问R2、3、4The user segment byR5,访问R5、6、7网段通过R1,So to do routing policy

此处可以借助BGPRouting rules to reduce the amount of configuration, 由于R2与R5之间为IBGP关系,且通过IBGPNeighbors routing in passed to learnEBGPNeighbors will erase properties,MEDValue will not show,In the routing table is equivalent to /0,So I can take this,只在R2上宣告2、3、4用户网段,R2传给R5再传给R1Routing will be better thanR2直接传给R1的,R1会将R5Add table,从而满足题目要求,同理在R5上宣告5、6、7用户网段.但是2与5The user segment withR1Was built directly connected neighbors,So they proclaimed routingMED值为0,与通过IBGPLearning is the same,So will compareRouter id,R5的大于R2所以5The road user segment to choose the right,只需修改2的用户网段

[R2]ip ip-prefix a permit 172.16.2.0 24  (抓取流量)
[R2]route-policy a permit node 10
[R2-route-policy]if-match ip-prefix med 
[R2-route-policy]apply cost 1
[R2]route-policy a permit node 20     （建立空表）

去BGP调用

[R2]bgp 2

[R2-bgp]peer 12.1.1.1 route-policy a export       （出方向调用）

此时可以在R1上查看

Can see the requirements and existing backup

Can also add a summary to the backup

[R2-bgp]aggregate 172.16.0.0 16 detail-suppressed 

再到R1上查看

You can see the summary

最后进行测试