前言：本次结合之前学习到的IS-IS与BGP协议，做一个综合实验，除了复习下IS-IS与BGP协议的配置以及BGP邻居关系的建立之外，还涉及到BGP下一跳的优化，路由反射器的配置等其他知识
文章目录
- 一、实验环境
-
- 1.环境
- 2.需求
- 3.拓扑图
- 二、详细配置
-
- 1.给接口配置IP
- 2.配置ISIS协议
-
- 1）开启ISIS
- 2）进入接口开启ISIS协议
- 3.配置BGP协议
-
- 1）配置IBGP协议，建立邻居关系
-
- R1与R2、R3、R6、R7建立邻居关系
- R2与R1、R3、R5、R6建立邻居关系
- R3与R1、R2、R5、R7建立邻居关系
- R5与R2、R3、R6、R7建立邻居关系
- R6与R1、R2、R5、R7建立邻居关系
- R7与R1、R3、R5、R6建立邻居关系
- 2）配置路由反射器
-
- R2配置路由反射客户端
- R6配置路由器反射客户端
- R3配置路由器反射客户端
- R7配置路由器反射客户端
- 3）配置EBGP
- 3.测试
一、实验环境
1.环境
- 实验软件：eNSP模拟机
- 八台路由器，分成基层，市干核心，省干核心，国干核心路由
2.需求
- 1、通过ISIS将AS内部的直连和环回口路由宣告
- 2、通过配置BGP协议将所有的用户业务路由宣告
- 3、通过配置路由反射器实现市内、省内路由互通
- 4、通过建立EBGP邻居实现全省和互联网路由互传
3.拓扑图
二、详细配置
1.给接口配置IP
- 先将每个路由器的接口配上IP，可以用 dis ip int b 命令查看接口信息
//这里就只展示接口信息，部分内容省略
R1：
[R1]dis ip int b
。。省略部分内容
GigabitEthernet0/0/0 12.0.0.1/30 up up
GigabitEthernet0/0/1 16.0.0.1/30 up up
LoopBack0 1.1.1.1/32 up up(s)
R2：
[R2]dis ip int b
GigabitEthernet0/0/0 12.0.0.2/30 up up
GigabitEthernet0/0/1 23.0.0.1/30 up up
GigabitEthernet0/0/2 26.0.0.1/30 up up
GigabitEthernet0/0/3 25.0.0.2/30 up up
LoopBack0 2.2.2.2/32 up up(s)
R3：
[R3]dis ip int b
GigabitEthernet0/0/0 23.0.0.2/30 up up
GigabitEthernet0/0/1 34.0.0.1/30 up up
GigabitEthernet0/0/2 37.0.0.1/30 up up
LoopBack0 3.3.3.3/32 up up(s)
R4：
[R4]dis ip int b
GigabitEthernet0/0/0 34.0.0.2/30 up up
GigabitEthernet0/0/1 48.0.0.1/30 up up
LoopBack0 4.4.4.4/32 up up(s)
R5：
[R5]dis ip int b
GigabitEthernet0/0/0 56.0.0.1/30 up up
GigabitEthernet0/0/1 25.0.0.1/30 up up
LoopBack0 5.5.5.5/32 up up(s)
R6：
[R6]dis ip int b
GigabitEthernet0/0/0 56.0.0.2/30 up up
GigabitEthernet0/0/1 67.0.0.1/30 up up
GigabitEthernet0/0/2 26.0.0.2/30 up up
GigabitEthernet0/0/3 16.0.0.2/30 up up
LoopBack0 6.6.6.6/32 up up(s)
R7：
[R7]dis ip int b
GigabitEthernet0/0/0 67.0.0.2/30 up up
GigabitEthernet0/0/1 78.0.0.1/30 up up
GigabitEthernet0/0/2 37.0.0.2/30 up up
LoopBack0 7.7.7.7/32 up up(s)
R8：
[R8]dis ip int b
GigabitEthernet0/0/0 78.0.0.2/30 up up
GigabitEthernet0/0/1 48.0.0.2/30 up up
LoopBack0 8.8.8.8/32 up up(s)
2.配置ISIS协议
- R1、R2、R3、R5、R6、R7跑ISIS
- R1、R2、R5、R6边缘启ISIS
- R3、R7骨干启ISIS
- 配置ISIS协议，将AS内部的直连和环回口的路由宣告
1）开启ISIS
- 以R1路由器为例，开启ISIS协议，并宣告NSAP以及级别
[R1]isis 1 //开启
[R1-isis-1]network-entity 49.0001.0010.0100.1001.00 //宣告NSAP
[R1-isis-1]is-level level-1 //配置IS-IS路由级别
2）进入接口开启ISIS协议
- 以R1路由器为例，在每个接口内开启ISIS协议
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]isis en //开启isis
[R1-GigabitEthernet0/0/0]int g0/0/1
[R1-GigabitEthernet0/0/1]isis enable
[R1-GigabitEthernet0/0/1]int loo 0
[R1-LoopBack0]isis enable
- 给同在ISIS协议内的R2,R3,R5,R6,R7路由器进行配置
- 与R1路由器配置思路相同，除了R3的G0/0/1和R7的G0/0/1接口不需要开启isis，其他每个接口都需要开启ISIS，
- 各路由器的NSAP与级别不同
各路由器的NSAP：
R2的NSAP：network-entity 49.0001.0010.0100.1001.00
R3的NSAP：network-entity 49.0000.0010.0100.1001.00
R5的NSAP：network-entity 49.0001.0010.0100.1001.00
R6的NSAP：network-entity 49.0001.0010.0100.1001.00
R7的NSAP：network-entity 49.0000.0010.0100.1001.00
各路由器的ISIS路由级别：
R2的路由级别：is-level level-1-2
R3的路由级别：is-level level-2
R5的路由级别：is-level level-1
R6的路由级别：is-level level-1-2
R7的路由级别：is-level level-2
注意：R3的G0/0/1和R7的G0/0/1接口不需要开启isis
- 配置完成后，我们需要通过路由泄露的方法让R1和R5路由器能够学习到其他路由的信息
[R2]isis 1
[R2-isis-1]import-route isis level-2 into level-1
[R6]isis 1
[R6-isis-1]import-route isis level-2 into level-1
- 此时，在ISIS协议内，所有路由都可互相学习到路由信息
- 比如查看R1路由器的信息
[R1]dis ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 19 Routes : 22
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 ISIS-L1 15 10 D 12.0.0.2 GigabitEthernet
0/0/0
ISIS-L1 15 10 D 16.0.0.2 GigabitEthernet
0/0/1
1.1.1.1/32 Direct 0 0 D 127.0.0.1 LoopBack0
2.2.2.2/32 ISIS-L1 15 10 D 12.0.0.2 GigabitEthernet
0/0/0
3.3.3.3/32 ISIS-L1 15 20 D 12.0.0.2 GigabitEthernet
0/0/0
5.5.5.5/32 ISIS-L1 15 20 D 12.0.0.2 GigabitEthernet
0/0/0
ISIS-L1 15 20 D 16.0.0.2 GigabitEthernet
0/0/1
6.6.6.6/32 ISIS-L1 15 10 D 16.0.0.2 GigabitEthernet
0/0/1
11.0.0.0/30 Direct 0 0 D 11.0.0.1 LoopBack1
11.0.0.1/32 Direct 0 0 D 127.0.0.1 LoopBack1
12.0.0.0/30 Direct 0 0 D 12.0.0.1 GigabitEthernet
0/0/0
12.0.0.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
16.0.0.0/30 Direct 0 0 D 16.0.0.1 GigabitEthernet
0/0/1
16.0.0.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
23.0.0.0/30 ISIS-L1 15 20 D 12.0.0.2 GigabitEthernet
0/0/0
25.0.0.0/30 ISIS-L1 15 20 D 12.0.0.2 GigabitEthernet
0/0/0
26.0.0.0/30 ISIS-L1 15 20 D 12.0.0.2 GigabitEthernet
0/0/0
ISIS-L1 15 20 D 16.0.0.2 GigabitEthernet
0/0/1
37.0.0.0/30 ISIS-L1 15 30 D 12.0.0.2 GigabitEthernet
0/0/0
56.0.0.0/30 ISIS-L1 15 20 D 16.0.0.2 GigabitEthernet
0/0/1
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
3.配置BGP协议
- 通过配置BGP协议将所有的用户业务路由宣告
1）配置IBGP协议，建立邻居关系
- R1、R2、R3、R5、R6、R7跑IBGP
R1与R2、R3、R6、R7建立邻居关系
router id 1.1.1.1 //宣告router id
bgp 56001 //开启bgp协议，56001为所在AS区域号
peer 2.2.2.2 as-number 56001 //与AS区域号为56001，ip为2.2.2.2的路由建立邻居关系
peer 2.2.2.2 connect-interface LoopBack 0 //与ip2.2.2.2的路由loopback 0接口建立邻居关系
peer 3.3.3.3 as-number 56001 //同上
peer 3.3.3.3 connect-interface LoopBack 0
peer 6.6.6.6 as-number 56001
peer 6.6.6.6 connect-interface LoopBack 0
peer 7.7.7.7 as-number 56001
peer 7.7.7.7 connect-interface LoopBack 0
R2与R1、R3、R5、R6建立邻居关系
router id 2.2.2.2
bgp 56001
peer 1.1.1.1 as-number 56001
peer 1.1.1.1 connect-interface LoopBack 0
peer 3.3.3.3 as-number 56001
peer 3.3.3.3 connect-interface LoopBack 0
peer 5.5.5.5 as-number 56001
peer 5.5.5.5 connect-interface LoopBack 0
peer 6.6.6.6 as-number 56001
peer 6.6.6.6 connect-interface LoopBack 0
R3与R1、R2、R5、R7建立邻居关系
router id 3.3.3.3
bgp 56001
peer 1.1.1.1 as-number 56001
peer 1.1.1.1 connect-interface LoopBack 0
peer 2.2.2.2 as-number 56001
peer 2.2.2.2 connect-interface LoopBack 0
peer 5.5.5.5 as-number 56001
peer 5.5.5.5 connect-interface LoopBack 0
peer 7.7.7.7 as-number 56001
peer 7.7.7.7 connect-interface LoopBack 0
R5与R2、R3、R6、R7建立邻居关系
router id 5.5.5.5
bgp 56001
peer 2.2.2.2 as-number 56001
peer 2.2.2.2 connect-interface LoopBack 0
peer 3.3.3.3 as-number 56001
peer 3.3.3.3 connect-interface LoopBack 0
peer 6.6.6.6 as-number 56001
peer 6.6.6.6 connect-interface LoopBack 0
peer 7.7.7.7 as-number 56001
peer 7.7.7.7 connect-interface LoopBack 0
R6与R1、R2、R5、R7建立邻居关系
router id 6.6.6.6
bgp 56001
peer 1.1.1.1 as-number 56001
peer 1.1.1.1 connect-interface LoopBack 0
peer 2.2.2.2 as-number 56001
peer 2.2.2.2 connect-interface LoopBack 0
peer 5.5.5.5 as-number 56001
peer 5.5.5.5 connect-interface LoopBack 0
peer 7.7.7.7 as-number 56001
peer 7.7.7.7 connect-interface LoopBack 0
R7与R1、R3、R5、R6建立邻居关系
router id 7.7.7.7
bgp 56001
peer 1.1.1.1 as-number 56001
peer 1.1.1.1 connect-interface LoopBack 0
peer 3.3.3.3 as-number 56001
peer 3.3.3.3 connect-interface LoopBack 0
peer 5.5.5.5 as-number 56001
peer 5.5.5.5 connect-interface LoopBack 0
peer 6.6.6.6 as-number 56001
peer 6.6.6.6 connect-interface LoopBack 0
- 可以用dis bgp peer 查看邻居关系建立情况
[R1]dis bgp peer
BGP local router ID : 1.1.1.1
Local AS number : 56001
Total number of peers : 4 Peers in established state : 4
Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre
fRcv
2.2.2.2 4 56001 13 14 0 00:11:22 Established
0
3.3.3.3 4 56001 11 12 0 00:09:27 Established
0
6.6.6.6 4 56001 9 10 0 00:08:00 Established
0
7.7.7.7 4 56001 3 3 0 00:01:23 Established
0
- 在R1上添加并宣告业务网段
[R1]int loo 1
[R1-LoopBack1]ip add 11.0.0.1 30
[R1-LoopBack1]
[R1]bgp 56001
[R1-bgp]network 11.0.0.0 30
2）配置路由反射器
- 通过配置路由反射器，实现市与省内路由互通
R2配置路由反射客户端
//通过配置路由反射器让R5能够学习到业务网段
bgp 56001
reflector cluster-id 100
peer 1.1.1.1 reflect-client
peer 5.5.5.5 reflect-client
R6配置路由器反射客户端
//在生产环境中我们还需要再R6上配置路由反射器，实现室内路由互通
bgp 56001
reflector cluster-id 100
peer 1.1.1.1 reflect-client
peer 5.5.5.5 reflect-client
- 需要在R3和R7上配置路由反射器来实现省内路由互通
R3配置路由器反射客户端
//R3与R6没有建立邻居关系，所以不需要做R6的反射
bgp 56001
reflector cluster-id 200
peer 2.2.2.2 reflect-client
R7配置路由器反射客户端
//R7与R2没有建立邻居关系，所以不需要做R2的反射
bgp 56001
reflector cluster-id 200
peer 6.6.6.6 reflect-client
- 配置完成后可实现省内互通
3）配置EBGP
- 建立EBGP邻居实现全省和互联网路由互传
//配置静态路由
[R3]ip route-static 4.4.4.4 32 34.0.0.2
[R7]ip route-static 8.8.8.8 32 78.0.0.2
[R4]ip route-static 3.3.3.3 32 34.0.0.1
[R8]ip route-static 7.7.7.7 32 78.0.0.1
//建立EBGP邻居
[R3]bgp 56001
[R3-bgp]peer 4.4.4.4 as-number 56002
[R3-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[R3-bgp]peer 4.4.4.4 ebgp-max-hop 2
[R4]router id 4.4.4.4
[R4]bgp 56002
[R4-bgp]peer 3.3.3.3 as-number 56001
[R4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[R4-bgp]peer 3.3.3.3 ebgp-max-hop 2
[R7]bgp 56001
[R7-bgp]peer 8.8.8.8 as-number 56002
[R7-bgp]peer 8.8.8.8 connect-interface LoopBack 0
[R7-bgp]peer 8.8.8.8 ebgp-max-hop 2
[R8]router id 8.8.8.8
[R8]bgp 56002
[R8-bgp]peer 7.7.7.7 as-number 56001
[R8-bgp]peer 7.7.7.7 connect-interface LoopBack 0
[R8-bgp]peer 7.7.7.7 ebgp-max-hop 2
- 给R4添加一条业务网段
[R4]int loo 1
[R4-LoopBack1]ip add 44.0.0.1 30
[R4-LoopBack1]q
[R4]bgp 56002
[R4-bgp]net
[R4-bgp]network 44.0.0.0 30
- R3和R7做个优化，使其他邻居路由器查看路由表的时候会更清晰
[R3-bgp]peer 1.1.1.1 next-hop-local
[R3-bgp]peer 2.2.2.2 next-hop-local
[R3-bgp]peer 5.5.5.5 next-hop-local
[R3-bgp]peer 7.7.7.7 next-hop-local
[R7-bgp]peer 1.1.1.1 next-hop-local
[R7-bgp]peer 3.3.3.3 next-hop-local
[R7-bgp]peer 5.5.5.5 next-hop-local
[R7-bgp]peer 6.6.6.6 next-hop-local
3.测试
- 在R1上ping测试44.0.0.1这个业务地址
[R1]ping -a 11.0.0.1 44.0.0.1
PING 44.0.0.1: 56 data bytes, press CTRL_C to break
Reply from 44.0.0.1: bytes=56 Sequence=1 ttl=253 time=110 ms
Reply from 44.0.0.1: bytes=56 Sequence=2 ttl=253 time=70 ms
Reply from 44.0.0.1: bytes=56 Sequence=3 ttl=253 time=70 ms
Reply from 44.0.0.1: bytes=56 Sequence=4 ttl=253 time=60 ms
Reply from 44.0.0.1: bytes=56 Sequence=5 ttl=253 time=90 ms
--- 44.0.0.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 60/80/110 ms
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