BGP——基本配置
根据TOP图配置接口的IP地址
AR1基础配置信息:
点击查看代码
[AR1]interface Serial1/0/0
[AR1-Serial1/0/0]ip address 10.11.15.1 255.255.255.0
[AR1]interface Serial1/0/1
[AR1-Serial1/0/1]ip address 10.11.13.1 255.255.255.0
[AR1]interface GigabitEthernet0/0/0
[AR1-GigabitEthernet0/0/0]ip address 10.11.12.1 255.255.255.0
[AR1]interface LoopBack0
[AR1-LoopBack0]ip address 1.1.1.1 255.255.255.255
AR2基础配置信息:
点击查看代码
[AR2]interface Serial1/0/0
[AR2-Serial1/0/0]ip address 10.11.23.2 255.255.255.0
[AR2]interface Serial1/0/1
[AR2-Serial1/0/1]ip address 10.11.24.2 255.255.255.0
[AR2]interface GigabitEthernet0/0/0
[AR2-GigabitEthernet0/0/0]ip address 10.11.12.2 255.255.255.0
[AR2]interface LoopBack0
[AR2-LoopBack0]ip address 2.2.2.2 255.255.255.255
AR3基础配置信息:
点击查看代码
[AR3]interface Serial1/0/0
[AR3-Serial1/0/0]ip address 10.11.23.3 255.255.255.0
[AR3]interface Serial1/0/1
[AR3-Serial1/0/1]ip address 10.11.13.3 255.255.255.0
[AR3]interface LoopBack0
[AR3-LoopBack0]ip address 3.3.3.3 255.255.255.255
AR4基础配置信息:
点击查看代码
[AR4]interface Serial1/0/1
[AR4-Serial1/0/1]ip address 10.11.24.4 255.255.255.0
[AR4]interface GigabitEthernet0/0/0
[AR4-GigabitEthernet0/0/0]ip address 200.11.11.2 255.255.255.0 | “200.11.11.2作为PC1的网关”
[AR4]interface LoopBack0
[AR4-LoopBack0]ip address 4.4.4.4 255.255.255.255
AR5基础配置信息:
点击查看代码
[AR5]interface Serial1/0/0
[AR5-Serial1/0/0]ip address 10.11.15.5 255.255.255.0
[AR5]interface LoopBack0
[AR5-LoopBack0]ip address 5.5.5.5 255.255.255.255
``以上为TOP图的基本IP配置
AR1_AR2_AR3的OSPF配置
AR1配置信息:
点击查看代码
[AR1]ospf 1
[AR1-ospf-1]area 0
[AR1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[AR1-ospf-1-area-0.0.0.0]network 10.11.12.0 0.0.0.255
[AR1-ospf-1-area-0.0.0.0]network 10.11.13.0 0.0.0.255
AR2配置信息:
点击查看代码
[AR2]ospf 1
[AR2-ospf-1]area 0
[AR2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[AR2-ospf-1-area-0.0.0.0]network 10.11.12.0 0.0.0.255
[AR2-ospf-1-area-0.0.0.0]network 10.11.23.0 0.0.0.255
AR3配置信息:
点击查看代码
[AR3]ospf 1
[AR3-ospf-1]area 0
[AR3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[AR3-ospf-1-area-0.0.0.0]network 10.11.13.0 0.0.0.255
[AR3-ospf-1-area-0.0.0.0]network 10.11.23.0 0.0.0.255
验证AR1_AR2_AR3邻居:
点击查看代码
----------------------------------------------------------------------------
| [AR1]dis ospf peer brief |
| ---------------------------------------------------------------------------- |
| OSPF Process 1 with Router ID 10.11.12.1 |
| Peer Statistic Information |
| ---------------------------------------------------------------------------- |
| Area Id Interface Neighbor id State |
| 0.0.0.0 GigabitEthernet0/0/0 10.11.12.2 Full |
| 0.0.0.0 Serial1/0/1 3.3.3.3 Full |
| ---------------------------------------------------------------------------- |
| [AR2]dis ospf peer brief |
| |
| OSPF Process 1 with Router ID 10.11.12.2 |
| Peer Statistic Information |
| ---------------------------------------------------------------------------- |
| Area Id Interface Neighbor id State |
| 0.0.0.0 GigabitEthernet0/0/0 10.11.12.1 Full |
| 0.0.0.0 Serial1/0/0 3.3.3.3 Full |
| ---------------------------------------------------------------------------- |
| [AR3]dis ospf peer brief |
| |
| OSPF Process 1 with Router ID 3.3.3.3 |
| Peer Statistic Information |
| ---------------------------------------------------------------------------- |
| Area Id Interface Neighbor id State |
| 0.0.0.0 Serial1/0/0 10.11.12.2 Full |
| 0.0.0.0 Serial1/0/1 10.11.12.1 Full |
| ---------------------------------------------------------------------------- |
BGP的邻居建立:
AR5_AR1配置信息：
点击查看代码
[AR5]bgp 50
[AR5-bgp]router-id 5.5.5.5
[AR5-bgp]peer 10.11.15.1 as-number 123
[AR1]bgp 123
[AR1-bgp]router-id 1.1.1.1
[AR1-bgp]peer 10.11.15.5 as-number 50
查看状态是否为 Established
[AR5]dis bgp peer
BGP local router ID : 5.5.5.5
Local AS number : 50
Total number of peers : 1 Peers in established state : 1
Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre
fRcv
10.11.15.1 4 123 38 33 0 00:29:49 Established
9
AR1_AR2_AR3配置信息:
点击查看代码
[AR1]bgp 123
[AR1-bgp]router-id 1.1.1.1
[AR1-bgp]peer 2.2.2.2 as-number 123
[AR1-bgp]peer 2.2.2.2 connect-interface LoopBack0
[AR1-bgp]peer 3.3.3.3 as-number 123
[AR1-bgp]peer 3.3.3.3 connect-interface LoopBack0
[AR2]bgp 123
[AR2-bgp]router-id 2.2.2.2
[AR2-bgp]peer 1.1.1.1 as-number 123
[AR2-bgp]peer 1.1.1.1 connect-interface LoopBack0
[AR2-bgp]peer 3.3.3.3 as-number 123
[AR2-bgp]peer 3.3.3.3 connect-interface LoopBack0
[AR3]bgp 123
[AR3-bgp]router-id 3.3.3.3
[AR3-bgp]peer 1.1.1.1 as-number 123
[AR3-bgp]peer 1.1.1.1 connect-interface LoopBack0
[AR3-bgp]peer 2.2.2.2 as-number 123
[AR3-bgp]peer 2.2.2.2 connect-interface LoopBack0
查看邻居状态是否为 Established 以AR1为例:
[AR1]dis bgp peer
BGP local router ID : 1.1.1.1
Local AS number : 123
Total number of peers : 3 Peers in established state : 3
Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre
fRcv
2.2.2.2 4 123 41 47 0 00:37:17 Established
4
3.3.3.3 4 123 40 47 0 00:37:20 Established
1
10.11.15.5 4 50 40 46 0 00:37:22 Established
1
AR2_AR4配置信息:
点击查看代码
[AR2]bgp 123
[AR2-bgp]peer 4.4.4.4 as-number 40
[AR2-bgp]peer 4.4.4.4 connect-interface LoopBack0
[AR2-bgp]peer 4.4.4.4 ebgp-max-hop 5
[AR4]bgp 40
[AR4-bgp]peer 2.2.2.2 as-number 123
[AR4-bgp]peer 2.2.2.2 connect-interface LoopBack0
[AR4-bgp]peer 2.2.2.2 ebgp-max-hop 5
> 由AR2_AR4连接线为串口线,需配置静态路由,实现邻居建立成功
[AR2]ip route-static 4.4.4.4 255.255.255.255 10.11.24.4
[AR4]ip route-static 2.2.2.2 255.255.255.255 10.11.24.2
查看邻居状态是否为 Established:
[AR4]dis bgp peer
BGP local router ID : 4.4.4.4
Local AS number : 40
Total number of peers : 1 Peers in established state : 1
Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre
fRcv
2.2.2.2 4 123 47 48 0 00:42:13 Established
7
BGP宣告及引入
点击查看代码
AR5宣告Lo0（5.5.5.5）进入BGP
[AR5]bgp 50
[AR5-bgp]network 5.5.5.5 255.255.255.255
查看BGP路由
[AR1]dis bgp routing-table
BGP Local router ID is 1.1.1.1
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 17
Network NextHop MED LocPrf PrefVal Path/Ogn
*> 5.5.5.5/32 10.11.15.5 0 0 50i
> AR1引入BGP
[AR1]bgp 123
[AR1-bgp]import-route direct
> AR2宣告Lo0（2.2.2.2）进入BGP
[AR2]bgp 123
[AR2-bgp]network 2.2.2.2 255.255.255.255
> AR2宣告Lo0（3.3.3.3）进入BGP
[AR2]bgp 123
[AR2-bgp]network 3.3.3.3 255.255.255.255
> AR4宣告Lo0（4.4.4.4）进入BGP
[AR4]bgp 123
[AR4-bgp]import-route direct
[AR4-bgp]network 4.4.4.4 255.255.255.255
修改Lo(5.5.5.5)的环回地址的BGP路由的下一跳为自身:
点击查看代码
未修改前)_以AR3为例
[AR3]display bgp routing-table
BGP Local router ID is 3.3.3.3
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 12
Network NextHop MED LocPrf PrefVal Path/Ogn
i 1.1.1.1/32 1.1.1.1 0 100 0 ?
i 2.2.2.2/32 2.2.2.2 0 100 0 i
*> 3.3.3.3/32 0.0.0.0 0 0 i
*>i 5.5.5.5/32 10.11.15.5 0 100 0 50i
*>i 10.11.12.0/24 1.1.1.1 0 100 0 ?
*>i 10.11.13.0/24 1.1.1.1 0 100 0 ?
*>i 10.11.13.3/32 1.1.1.1 0 100 0 ?
*>i 10.11.15.0/24 1.1.1.1 0 100 0 ?
*>i 10.11.15.5/32 1.1.1.1 0 100 0 ?
*>i 10.11.24.0/24 2.2.2.2 0 100 0 40?
*>i 10.11.24.2/32 2.2.2.2 0 100 0 40?
*>i 200.11.11.0 2.2.2.2 0 100 0 40?
为了验证修改效果先对AR3进行修改：
[AR3]bgp 123
[AR3-bgp]peer 1.1.1.1 next-hop-local
[AR3-bgp]peer 2.2.2.2 next-hop-local
若查看未改变，quit到<AR3>refresh bgp all import 重新加载
再次查看即是 下一跳为1.1.1.1
*>i 5.5.5.5/32 1.1.1.1 0 100 0 50i
[AR1]bgp 123
[AR1-bgp]peer 3.3.3.3 next-hop-local
[AR1-bgp]peer 2.2.2.2 next-hop-local
[AR2]bgp 123
[AR2-bgp]peer 1.1.1.1 next-hop-local
[AR2-bgp]peer 3.3.3.3 next-hop-local
查看AR5的BGP路由:
点击查看代码
[AR5]dis bgp routing-table
BGP Local router ID is 5.5.5.5
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 10
Network NextHop MED LocPrf PrefVal Path/Ogn
*> 1.1.1.1/32 10.11.15.1 0 0 123?
*> 5.5.5.5/32 0.0.0.0 0 0 i
*> 10.11.12.0/24 10.11.15.1 0 0 123?
*> 10.11.13.0/24 10.11.15.1 0 0 123?
*> 10.11.13.3/32 10.11.15.1 0 0 123?
*> 10.11.15.0/24 10.11.15.1 0 0 123?
*> 10.11.15.5/32 10.11.15.1 0 0 123?
*> 10.11.24.0/24 10.11.15.1 0 123 40?
*> 10.11.24.2/32 10.11.15.1 0 123 40?
*> 200.11.11.0 10.11.15.1 0 123 40?
验证AR5 ping/tracert PC1
点击查看代码
[AR5]ping -a 5.5.5.5 200.11.11.100
PING 200.11.11.100: 56 data bytes, press CTRL_C to break
Reply from 200.11.11.100: bytes=56 Sequence=1 ttl=125 time=30 ms
Reply from 200.11.11.100: bytes=56 Sequence=2 ttl=125 time=40 ms
Reply from 200.11.11.100: bytes=56 Sequence=3 ttl=125 time=30 ms
Reply from 200.11.11.100: bytes=56 Sequence=4 ttl=125 time=30 ms
Reply from 200.11.11.100: bytes=56 Sequence=5 ttl=125 time=30 ms
--- 200.11.11.100 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 30/32/40 ms
----------------------------------------------------------------------------
[AR5]tracert -a 5.5.5.5 200.11.11.100
traceroute to 200.11.11.100(200.11.11.1
00), max hops: 30 ,packet length: 40,press CTRL_C to break
1 10.11.15.1 20 ms 20 ms 10 ms
2 10.11.12.2 < AS=123 > 40 ms 10 ms 20 ms
3 10.11.24.4 < AS=40 > 30 ms 30 ms 20 ms
4 200.11.11.100 < AS=40 > 40 ms 30 ms 20 ms
40? ？标识此路由通过引入的方式成为BGP路由的
50i i标识此路由通过network的方式成为BGP路由的
*> *代表有效的路由， >代表最优路由
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