BGP-ISIS实验
（控制层面）ISIS 主要功能跑底层框架路由网段：直连、环回地址
（数据层面）IBGP 直接宣告的方式，将业务网段发布
业务网段不在ISIS里面跑
BARS/SR中，它是有好多条业务网段，上万条
如果在ISIS里面跑，ISIS内的链路信息数据库会变得很庞大
所以业务网段由IBGP发布出去
学习到的知识点：
1.AS6500 ISIS能通
2.IBGP能通
3.EBGP能通
4.优化路由器反射器，next-hop-local
实验步骤：
1.配置接口IP
R1
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sysname R1
[R1]int g 0/0/0
[R1-GigabitEthernet0/0/0]ip add 12.0.0.1 30
[R1-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R1-GigabitEthernet0/0/0]q
[R1]int g 0/0/1
[R1-GigabitEthernet0/0/1]ip add 16.0.0.1 30
[R1-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R1-GigabitEthernet0/0/1]q
[R1]int loo 0
[R1-LoopBack0]ip add 1.1.1.1 32
[R1-LoopBack0]q
[R1]int loo 1
[R1-LoopBack1]ip add 11.0.0.1 30
[R1-LoopBack1]q
R2
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sysname R2
[R2]int g 0/0/0
[R2-GigabitEthernet0/0/0]ip add 12.0.0.2 30
[R2-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R2-GigabitEthernet0/0/0]q
[R2]int g 0/0/1
[R2-GigabitEthernet0/0/1]ip add 23.0.0.1 30
[R2-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R2-GigabitEthernet0/0/1]q
[R2]int g 0/0/2
[R2-GigabitEthernet0/0/2]ip add 26.0.0.1 30
[R2-GigabitEthernet0/0/2]un sh
Info: Interface GigabitEthernet0/0/2 is not shutdown.
[R2-GigabitEthernet0/0/2]q
[R2]int g 0/0/3
[R2-GigabitEthernet0/0/3]ip add 25.0.0.2 30
[R2-GigabitEthernet0/0/3]un sh
Info: Interface GigabitEthernet0/0/3 is not shutdown.
[R2-GigabitEthernet0/0/3]q
[R2]int loo 0
[R2-LoopBack0]ip add 2.2.2.2 32
[R2-LoopBack0]q
R3
[Huawei]sysname r3
[r3]UN IN EN
Info: Information center is disabled.
[r3]int g 0/0/0
[r3-GigabitEthernet0/0/0]ip add 23.0.0.2 30
[r3-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[r3-GigabitEthernet0/0/0]q
[r3]int g 0/0/1
[r3-GigabitEthernet0/0/1]ip add 34.0.0.1 30
[r3-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[r3-GigabitEthernet0/0/1]q
[r3]int g 0/0/2
[r3-GigabitEthernet0/0/2]ip add 37.0.0.1 30
[r3-GigabitEthernet0/0/2]un sh
Info: Interface GigabitEthernet0/0/2 is not shutdown.
[r3-GigabitEthernet0/0/2]q
[r3]int loo 0
[r3-LoopBack0]ip add 3.3.3.3 32
[r3-LoopBack0]q
R4
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sys
[Huawei]sysname R4
[R4]int g 0/0/0
[R4-GigabitEthernet0/0/0]ip add 34.0.0.2 30
[R4-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R4-GigabitEthernet0/0/0]q
[R4]int g 0/0/1
[R4-GigabitEthernet0/0/1]ip add 48.0.0.1 30
[R4-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R4-GigabitEthernet0/0/1]q
[R4]int loo 0
[R4-LoopBack0]ip add 4.4.4.4 32
[R4-LoopBack0]q
R5
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sys
[Huawei]sysname R5
[R5]int g 0/0/0
[R5-GigabitEthernet0/0/0]ip add 56.0.0.1 30
[R5-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R5-GigabitEthernet0/0/0]q
[R5]int g 0/0/1
[R5-GigabitEthernet0/0/1]ip add 25.0.0.1 30
[R5-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R5-GigabitEthernet0/0/1]q
[R5]int loo 0
[R5-LoopBack0]ip add 5.5.5.5 32
[R5-LoopBack0]q
R6
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sys
[Huawei]sysname R6
[R6]int g 0/0/0
[R6-GigabitEthernet0/0/0]ip add 56.0.0.2 30
[R6-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R6-GigabitEthernet0/0/0]q
[R6]int g 0/0/1
[R6-GigabitEthernet0/0/1]ip add 67.0.0.1 30
[R6-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R6-GigabitEthernet0/0/1]q
[R6]int g 0/0/2
[R6-GigabitEthernet0/0/2]ip add 26.0.0.2 30
[R6-GigabitEthernet0/0/2]un sh
Info: Interface GigabitEthernet0/0/2 is not shutdown.
[R6-GigabitEthernet0/0/2]q
[R6]int g 0/0/3
[R6-GigabitEthernet0/0/3]ip add 16.0.0.2 30
[R6-GigabitEthernet0/0/3]un sh
Info: Interface GigabitEthernet0/0/3 is not shutdown.
[R6-GigabitEthernet0/0/3]q
[R6]int loo 0
[R6-LoopBack0]ip add 6.6.6.6 32
[R6-LoopBack0]q
R7
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sys
[Huawei]sysname R7
[R7]int g 0/0/0
[R7-GigabitEthernet0/0/0]ip add 67.0.0.2 30
[R7-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R7-GigabitEthernet0/0/0]q
[R7]int g 0/0/01
[R7-GigabitEthernet0/0/1]ip add 78.0.0.1 30
[R7-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R7-GigabitEthernet0/0/1]q
[R7]int g 0/0/2
[R7-GigabitEthernet0/0/2]ip add 37.0.0.2 30
[R7-GigabitEthernet0/0/2]un sh
Info: Interface GigabitEthernet0/0/2 is not shutdown.
[R7-GigabitEthernet0/0/2]q
[R7]int loo 0
[R7-LoopBack0]ip add 7.7.7.7 32
[R7-LoopBack0]q
R8
system-view
Enter system view, return user view with Ctrl+Z.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]sys
[Huawei]sysname R8
[R8]int g 0/0/0
[R8-GigabitEthernet0/0/0]ip add 78.0.0.2 30
[R8-GigabitEthernet0/0/0]un sh
Info: Interface GigabitEthernet0/0/0 is not shutdown.
[R8-GigabitEthernet0/0/0]q
[R8]int g 0/0/1
[R8-GigabitEthernet0/0/1]ip add 48.0.0.2 30
[R8-GigabitEthernet0/0/1]un sh
Info: Interface GigabitEthernet0/0/1 is not shutdown.
[R8-GigabitEthernet0/0/1]q
[R8]int loo 0
[R8-LoopBack0]ip add 8.8.8.8 32
[R8-LoopBack0]q
[R8]
接口IP配置完毕
开始配置isis
R1是L1 R2是L1-2 R3是L2
R5是L1 R6是L1-2 R7是L2
R1
[R1]isis
[R1-isis-1]network-entity 49.0001.0010.0100.1001.00
[R1-isis-1]is-level level-1
Info: IS Level Changed, Resetting ISIS...
[R1-isis-1]q
[R1]int g 0/0/0
[R1-GigabitEthernet0/0/0]is en
[R1-GigabitEthernet0/0/0]q
[R1]int g 0/0/1
[R1-GigabitEthernet0/0/1]is en
[R1-GigabitEthernet0/0/1]q
[R1]int loo 0
[R1-LoopBack0]is en
[R1-LoopBack0]q
R2
[R2]isis
[R2-isis-1]network-entity 49.0001.0020.0200.2002.00
[R2-isis-1]is-level level-1-2
[R2-isis-1]q
[R2]int g 0/0/0
[R2-GigabitEthernet0/0/0]is en
[R2-GigabitEthernet0/0/0]q
[R2]int g 0/0/1
[R2-GigabitEthernet0/0/1]is en
[R2-GigabitEthernet0/0/1]q
[R2]int g 0/0/2
[R2-GigabitEthernet0/0/2]is en
[R2-GigabitEthernet0/0/2]q
[R2]int g 0/0/3
[R2-GigabitEthernet0/0/3]is en
[R2-GigabitEthernet0/0/3]q
[R2]int loo 0
[R2-LoopBack0]is en
[R2-LoopBack0]q
R3：R3的与国干网相连的接口g0/0/1不需要开启isis ，因为它是要跑bgp的，R7也是同样的道理
[r3]isis
[r3-isis-1]network-entity 49.0000.0030.0300.3003.00
[r3-isis-1]is-level level-2
Info: IS Level Changed, Resetting ISIS...
[r3-isis-1]q
[r3]int g 0/0/0
[r3-GigabitEthernet0/0/0]is en
[r3-GigabitEthernet0/0/0]q
[r3]int g 0/0/2
[r3-GigabitEthernet0/0/2]is en
[r3-GigabitEthernet0/0/2]q
[r3]int loo 0
[r3-LoopBack0]is en
[r3-LoopBack0]q
R5
[R5]isis
[R5-isis-1]network-entity 49.0001.0050.0500.5005.00
[R5-isis-1]is-level level-1
Info: IS Level Changed, Resetting ISIS...
[R5-isis-1]q
[R5]int g 0/0/0
[R5-GigabitEthernet0/0/0]is en
[R5-GigabitEthernet0/0/0]q
[R5]int g 0/0/1
[R5-GigabitEthernet0/0/1]is en
[R5-GigabitEthernet0/0/1]q
[R5]int loo 0
[R5-LoopBack0]is en
[R5-LoopBack0]q
R6
[R6]isis
[R6-isis-1]network-entity 49.0001.0060.0600.6006.00
[R6-isis-1]is-level level-1-2
[R6-isis-1]q
[R6]int g 0/0/0
[R6-GigabitEthernet0/0/0]is en
[R6-GigabitEthernet0/0/0]q
[R6]int g 0/0/1
[R6-GigabitEthernet0/0/1]is en
[R6-GigabitEthernet0/0/1]q
[R6]int g 0/0/2
[R6-GigabitEthernet0/0/2]is en
[R6-GigabitEthernet0/0/2]q
[R6]int g 0/0/3
[R6-GigabitEthernet0/0/3]is en
[R6-GigabitEthernet0/0/3]q
[R6]int loo 0
[R6-LoopBack0]is en
[R6-LoopBack0]q
R7
[R7]isis
[R7-isis-1]network-entity 49.0000.0070.0700.7007.00
[R7-isis-1]is-level level-2
Info: IS Level Changed, Resetting ISIS...
[R7-isis-1]q
[R7]int g 0/0/0
[R7-GigabitEthernet0/0/0]is en
[R7-GigabitEthernet0/0/0]q
[R7]int g 0/0/2
[R7-GigabitEthernet0/0/2]is en
[R7-GigabitEthernet0/0/2]q
[R7]int loo 0
[R7-LoopBack0]is en
[R7-LoopBack0]q
R1和R5是L1路由，无法学习到L2类型的路由信息，只有一条汇总的默认路由，所以需要在L1-2的R2和R6上，在与L1路由器相连的接口上配置路由泄露，才可以学习到详细的路由信息
[R1]dis ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 18 Routes : 21
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
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
56.0.0.0/30 ISIS-L1 15 20 D 16.0.0.2 GigabitEthernet
0/0/1
67.0.0.0/30 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
配置路由泄露
R2
[R2]isis
[R2-isis-1]import-route ?
bgp Border Gateway Protocol (BGP) routes
direct Connect routes
isis Intermediate System to Intermediate System (ISIS) routes
ospf Open Shortest Path First (OSPF) routes
rip Routing Information Protocol (RIP) routes
static Static routes
unr User Network Routes (UNR) routes
[R2-isis-1]import-route isis level-2 into level-1
R6
[R6]isi
[R6-isis-1]imp isis level-2 into level-1
接下来通过配置BGP协议将所有的用户业务路由宣告
先配置IBGP协议，建立相连的邻居关系
R1的邻居关系为R2，R6
[R1]router id 1.1.1.1
[R1]bgp 56001
[R1-bgp]peer 2.2.2.2 as-number 56001
[R1-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[R1-bgp]peer 3.3.3.3 as-n 56001
[R1-bgp]peer 3.3.3.3 con lo 0
[R1-bgp]peer 6.6.6.6 as-number 56001
[R1-bgp]peer 6.6.6.6 connect-interface LoopBack 0
[R1-bgp]peer 7.7.7.7 as-n 56001
[R1-bgp]peer 7.7.7.7 con lo 0
[R1-bgp]q
R2的邻居关系为R1，R3,R5,R6
[R2]router id 2.2.2.2
[R2]bgp 56001
[R2-bgp]peer 1.1.1.1 as-number 56001
[R2-bgp]peer 1.1.1.1 connect-interface lo 0
[R2-bgp]peer 3.3.3.3 as-n 56001
[R2-bgp]peer 3.3.3.3 con lo 0
[R2-bgp]peer 5.5.5.5 as-n 56001
[R2-bgp]peer 5.5.5.5 con lo 0
[R2-bgp]peer 6.6.6.6 as-n 56001
[R2-bgp]peer 6.6.6.6 con lo 0
[R2-bgp]q
R3的邻居关系为R1,R2,R5,R7
[r3]router id 3.3.3.3
[r3]bgp 56001
[r3-bgp]peer 1.1.1.1 as-n 56001
[r3-bgp]peer 1.1.1.1 con lo 0
[r3-bgp]peer 2.2.2.2 as-n 56001
[r3-bgp]peer 2.2.2.2 con lo 0
[r3-bgp]peer 5.5.5.5 as-n 56001
[r3-bgp]peer 5.5.5.5 con lo 0
[r3-bgp]peer 7.7.7.7 as-n 56001
[r3-bgp]peer 7.7.7.7 con lo 0
[r3-bgp]q
R5的邻居关系为R2，R3，R6，R7
[R5]router id 5.5.5.5
[R5]bgp 56001
[R5-bgp]peer 2.2.2.2 as-n 56001
[R5-bgp]peer 2.2.2.2 con lo 0
[R5-bgp]peer 3.3.3.3 as-n 56001
[R5-bgp]peer 3.3.3.3 con lo 0
[R5-bgp]peer 6.6.6.6 as-n 56001
[R5-bgp]peer 6.6.6.6 con lo 0
[R5-bgp]peer 7.7.7.7 as-n 56001
[R5-bgp]peer 7.7.7.7 con lo 0
[R5-bgp]q
R6的邻居关系是R1，R2，R5，R7
[R6]router id 6.6.6.6
[R6]bgp 56001
[R6-bgp]peer 1.1.1.1 as-n 56001
[R6-bgp]peer 1.1.1.1 con loo 0
[R6-bgp]peer 2.2.2.2 as-n 56001
[R6-bgp]peer 2.2.2.2 con loo 0
[R6-bgp]peer 5.5.5.5 as-n 56001
[R6-bgp]peer 5.5.5.5 con loo 0
[R6-bgp]peer 7.7.7.7 as-n 56001
[R6-bgp]peer 7.7.7.7 con lo 0
[R6-bgp]q
R7的邻居关系是R1，R3，R5，R6
[R7]router id 7.7.7.7
[R7]bgp 56001
[R7-bgp]peer 1.1.1.1 as-n 56001
[R7-bgp]peer 1.1.1.1 con lo 0
[R7-bgp]peer 3.3.3.3 as-nu 56001
[R7-bgp]peer 3.3.3.3 con lo 0
[R7-bgp]peer 5.5.5.5 as-n 56001
[R7-bgp]peer 5.5.5.5 con lo 0
[R7-bgp]peer 6.6.6.6 as-n 56001
[R7-bgp]peer 6.6.6.6 con lo 0
[R7-bgp]q
在R1的BGP内内宣告业务网段
[R1]bgp 56001
[R1-bgp]netwo
[R1-bgp]network 11.0.0.0 30
[R1-bgp]q
到R5上查看路由，发现并没有学到11.0.0.0/30
这时可以配置路由反射来让其学习到
[R2]bgp 56001
[R2-bgp]reflector cluster-id 100
[R2-bgp]peer 1.1.1.1 reflect-client
此时就可以发现R5上可以学习到11.0.0.0/30网段了
[R5]dis ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
11.0.0.0/30 IBGP 255 0 RD 1.1.1.1 GigabitEthernet
0/0/1
继续配置
[R2-bgp]peer 5.5.5.5 reflect-client
在R6备用路由设置路由反射
[R6]bgp 56001
[R6-bgp]reflector cluster-id 100
[R6-bgp]peer 1.1.1.1 reflect-client
[R6-bgp]peer 5.5.5.5 reflect-client
[R6-bgp]q
在省干中配置，实现省内路由互通
R3配置
[r3]bgp 56001
[r3-bgp]reflector cluster-id 200
[r3-bgp]peer 2.2.2.2 reflect-client
在R7配置
[R7]bgp 56001
[R7-bgp]reflector cluster-id 200
[R7-bgp]peer 6.6.6.6 reflect-client
此时省内级别路由已经实现互通
接下来开始处理EBGP邻居关系
R3
[r3]bgp 56001
[r3-bgp]peer 4.4.4.4 as-number 56002
[r3-bgp]peer 4.4.4.4 con lo 0
[r3-bgp]peer 4.4.4.4 ebgp-max-hop 2
[r3-bgp]q
[r3]dis bgp peer
1.1.1.1 4 56001 72 73 0 01:09:21 Established
1
2.2.2.2 4 56001 139 140 0 02:14:54 Established
1
4.4.4.4 4 56002 0 0 0 00:02:06 Idle
R7
[R7]bgp 56001
[R7-bgp]peer 8.8.8.8 as-n 56002
[R7-bgp]peer 8.8.8.8 con lo 0
[R7-bgp]peer 8.8.8.8 ebgp-max-hop 2
[R7-bgp]q
R4
顺便设置模拟业务网段
[R4]int loo 1
[R4-LoopBack1]ip add 44.0.0.1 30
[R4-LoopBack1]q
[R4]router id 4.4.4.4
[R4-bgp]bgp 56002
network 4.4.4.4 255.255.255.255
network 34.0.0.0 255.255.255.252
network 44.0.0.0 255.255.255.252
network 48.0.0.0 255.255.255.252
[R4-bgp]peer 8.8.8.8 as-n 56002
[R4-bgp]peer 8.8.8.8 con lo 0
[R4-bgp]peer 3.3.3.3 as-n 56001
[R4-bgp]peer 3.3.3.3 con lo 0
[R4-bgp]peer 3.3.3.3 eb 2
[R4-bgp]q
[R4]dis bgp peer
BGP local router ID : 4.4.4.4
Local AS number : 56002
Total number of peers : 2 Peers in established state : 0
Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre
fRcv
3.3.3.3 4 56001 0 0 0 00:00:13 Idle
0
8.8.8.8 4 56002 0 0 0 00:18:40 Idle
0
[R4]
R8
[R8]router id 8.8.8.8
[R8]bgp 56002
[R8-bgp]
peer 4.4.4.4 as-number 56002
peer 4.4.4.4 connect-interface LoopBack0
network 8.8.8.8 255.255.255.255
network 48.0.0.0 255.255.255.252
network 78.0.0.0 255.255.255.252
peer 4.4.4.4 enable
[R8]bgp 56002
[R8-bgp]peer 7.7.7.7 as-n 56001
[R8-bgp]peer 7.7.7.7 con lo 0
[R8-bgp]peer 7.7.7.7 eb 2
[R8-bgp]q
[R8]
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
[R8]dis bgp peer
BGP local router ID : 8.8.8.8
Local AS number : 56002
Total number of peers : 2 Peers in established state : 1
Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre
fRcv
4.4.4.4 4 56002 0 0 0 00:38:01 Idle
0
7.7.7.7 4 56001 5 7 0 00:02:39 Established
1
[R4-bgp]dis ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 11 Routes : 11
Destination/Mask Proto Pre Cost Flags NextHop Interface
3.3.3.3/32 Static 60 0 RD 34.0.0.1 GigabitEthernet
0/0/0
4.4.4.4/32 Direct 0 0 D 127.0.0.1 LoopBack0
11.0.0.0/30 EBGP 255 0 RD 3.3.3.3 GigabitEthernet
0/0/0
34.0.0.0/30 Direct 0 0 D 34.0.0.2 GigabitEthernet
0/0/0
34.0.0.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
44.0.0.0/30 Direct 0 0 D 44.0.0.1 LoopBack1
44.0.0.1/32 Direct 0 0 D 127.0.0.1 LoopBack1
48.0.0.0/30 Direct 0 0 D 48.0.0.1 GigabitEthernet
0/0/1
48.0.0.1/32 Direct 0 0 D 127.0.0.1 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
EBGP邻居关系建立，此时，R4R8学到了11.0.0.0/30的EBGP路由
R1中没有学到44.0.0.0/30
在bgp中注入静态路由
[r3-bgp]peer 1.1.1.1 next-hop-local //这条命令是优化下一跳
[r3-bgp]import-route static
这时R1学到R4的所有网段（IBGP），还没有学到78.0.0.0/30
在R7中注入静态
[R7-bgp]import-route static
此时学到78.0.0.0/30，下一跳是3.3.3.3
对所有节点进行下一跳优化
[r3-bgp]peer 1.1.1.1 next-hop-local
peer 2.2.2.2 next-hop-local
peer 5.5.5.5 next-hop-local
peer 7.7.7.7 next-hop-local
[R7-bgp]peer 1.1.1.1 next-hop-local
peer 3.3.3.3 next-hop-local
peer 5.5.5.5 next-hop-local
peer 6.6.6.6 next-hop-local
在R1上测试11.0.0.1ping 44.0.0.1
[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=60 ms
Reply from 44.0.0.1: bytes=56 Sequence=2 ttl=253 time=90 ms
Reply from 44.0.0.1: bytes=56 Sequence=3 ttl=253 time=100 ms
Reply from 44.0.0.1: bytes=56 Sequence=4 ttl=253 time=80 ms
Reply from 44.0.0.1: bytes=56 Sequence=5 ttl=253 time=60 ms
--- 44.0.0.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 60/78/100 ms