7.3 BGP配置详解-大赛人网

1.BGP基础配置

1）基本配置

[R1]bgp 12
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 12.1.1.2 as-number 12

[R2]bgp 12
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 12.1.1.1 as-number 12
[R2-bgp]peer 23.1.1.3 as-number 300

[R3]bgp 300
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 23.1.1.2 as-number 12
[R3-bgp]network  3.0.0.0 8

2）查看R1的BGP邻接信息

[R1]display bgp peer 
Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State PrefRcv
12.1.1.2        4          12        3        4     0 00:01:43 Established       0

3）查看R3的BGP路由表

[R3]display bgp routing-table 
 BGP Local router ID is 3.3.3.3 
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
*>   3.0.0.0            0.0.0.0         0                     0      i

4）查看R2的BGP路由表

<R2>dis bgp routing-table
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn 
*>   3.0.0.0            23.1.1.3        0                     0      300i

<R2>display ip routing-table protocol bgp 
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface
3.0.0.0/8   EBGP    255  0           D   23.1.1.3        GigabitEthernet0/0/1

5）查看R1的BGP路由表（BGP路由不可用）

<R1>dis bgp routing-table
 Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
i  3.0.0.0            23.1.1.3        0          100        0      300i

6）配置R2的next-hop-local属性解决R1的BGP路由不可用问题，查看R1路由表（BGP路由可用）

[R2]bgp 12
[R2-bgp]peer 12.1.1.1 next-hop-local

7）查看R1路由表（BGP路由可用）

<R1>display bgp routing-table 
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
*>i  3.0.0.0            12.1.1.2        0          100        0      300i

2.指定BGP更新源IP地址

图片[2]-7.3 BGP配置详解-大赛人网 — 图7-2 BGP更新源IP地址网络拓扑

1）OSPF基本配置

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255

[R2]ospf 1 router-id 2.2.2.2 
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.255

2）BGP基本配置

[R1]bgp 12
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 2.2.2.2 as-number 12
[R1-bgp]peer 2.2.2.2 connect-interface LoopBack 0

[R2]bgp 12
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 1.1.1.1 as-number 12
[R2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[R2-bgp]peer 23.1.1.3 as-number 300

[R3]bgp 300
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 23.1.1.2 as-number 12

3）R1的1.1.1.1/24和R的33.3.3.3/24宣告到BGP（3.3.3.3/24网络不可达）

[R1-bgp]network 1.1.1.1 24  
[R3-bgp]network 3.3.3.3 24

[R1]display bgp routing-table Network
NextHop        MED        LocPrf    PrefVal Path/Ogn
 *>   1.1.1.0/24         0.0.0.0         0                     0      i
   i  3.3.3.0/24         23.1.1.3        0          100        0      300i

4）解决R3的3.3.3.3/24网络不可达

[R2-bgp]peer 1.1.1.1 next-hop-local
[R1]display bgp routing-table Network
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
 *>   1.1.1.0/24         0.0.0.0         0                     0      i
 *>i  3.3.3.0/24         2.2.2.2         0          100        0      300i

3.BGP同步及路由黑洞

图片[3]-7.3 BGP配置详解-大赛人网 — 图7-3 BGP路由黑洞网络拓扑

1）OSPF基本配置

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255

[R2]ospf 1 router-id 2.2.2.2 
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255

[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.255 
[R3-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255

2）BGP基本配置（同时宣告1.1.1.1/24、4.4.4.4/24到BGP）

[R1]bgp 12
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 2.2.2.2 as-number 12
[R1-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[R1-bgp]network 1.1.1.1 24

[R2]bgp 12
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 1.1.1.1 as-number 12
[R2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[R2-bgp]peer 3.3.3.3 as-number 12
[R2-bgp]peer 3.3.3.3 connect-interface LoopBack 0

[R3]bgp 12
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 2.2.2.2 as-number 12
[R3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[R3-bgp]peer 34.1.1.4 as-number 400

[R4]bgp 400
[R4-bgp]peer 34.1.1.3 as-number 12
[R4-bgp]network 4.4.4.4 24

3）无R4的4.4.4.4/24网络

[R1-bgp]display bgp routing-table  
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
 *>   1.1.1.0/24         0.0.0.0         0                     0      i

4）向R2通告路由,把下一跳属性设为自身的IP地址

[R3-bgp]peer 2.2.2.2 next-hop-local
[R1-bgp]display bgp routing-table
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
*>   1.1.1.0/24         0.0.0.0         0                     0      i
i  4.4.4.0/24         34.1.1.4        0          100        0      400i

5）R4的4.4.4.4/24网络不可达,向R1通告路由,把下一跳属性设为自身的IP地址

[R3-bgp]peer 1.1.1.1 next-hop-local
[R1]display bgp routing-table
Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
*>   1.1.1.0/24         0.0.0.0         0                     0      i
*>i  4.4.4.0/24         3.3.3.3         0          100        0      400i

6）BGP路由跟踪

<R1>ping -a 1.1.1.1 4.4.4.4 
  PING 4.4.4.4: 56  data bytes, press CTRL_C to break
    Reply from 4.4.4.4: bytes=56 Sequence=1 ttl=253 time=30 ms
   <R4>ping -a 4.4.4.4 1.1.1.1
  PING 1.1.1.1: 56  data bytes, press CTRL_C to break
    Reply from 1.1.1.1: bytes=56 Sequence=1 ttl=253 time=30 ms

文章版权归作者所有，未经允许请勿转载。

THE END

路由