BGP实验--联邦以及反射器

实验明细

  • 实验拓扑
  • 实验要求
  • 实验内容

实验拓扑

BGP实验--联邦以及反射器_第1张图片

实验要求

1.R2-R7每台路由器均存在一个环回接口用于建立邻居;同时还存在一个环回来代表连接用户的接口;最终这些连接用户的接口网络需要可以和R1/8的环回通讯
2.AS2网段地址为172.16.0.0/16,减少路由条目数量

实验内容

IP地址的划分
R1:
环回1.1.1.1/24 R1/2网段12.1.1.0/24
R2/3网段 172.16.1.0/30
R3/4网段 172.16.1.4/30
R4/7网段 172.16.1.8/30
R6/7网段 172.16.1.12/30
R5/6网段 172.16.1.16/30
R2/5网段 172.16.1.20/30
R2两个环回:172.16.2.1/24 172.16.0.2/32
R3: 172.16.3.1/24 172.16.0.3/32
R4: 172.16.4.1/24 172.16.0.4/32
R5 :172.16.5.1/24 172.16.0.5/32
R6 : 172.16.6.1/24 172.16.0.6/32
R7 : 172.16.7.1/24 172.16.0.7/32
R7/8: 78.1.1.0/24
R8:8.8.8.8/24

ip地址规划完成,开始给每台路由器配置ip地址
R1

[r1]int lo0
[r1-LoopBack0]ip add 1.1.1.1 24
[r1-LoopBack0]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24

R2

[r2]int lo0
[r2-LoopBack0]ip add 172.16.0.2 32
[r2-LoopBack0]int lo1
[r2-LoopBack1]ip add 172.16.2.1 24
[r2-LoopBack1]int g0/0/0
[r2-GigabitEthernet0/0/0]ip ad 12.1.1.2 24
Aug  6 2022 21:10:14-08:00 r2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state. 
[r2-GigabitEthernet0/0/0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 172.16.1.1 30

R3

[r3]int lo0
[r3-LoopBack0]ip add 172.16.0.3 32
[r3-LoopBack0]int lo1
[r3-LoopBack1]ip add 172.16.3.1 24
[r3-LoopBack1]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 172.16.1.2 30
Aug  6 2022 21:11:29-08:00 r3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state. 
[r3-GigabitEthernet0/0/0]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 172.16.1.5 30

R4

[r4]int lo0
[r4-LoopBack0]ip add 172.16.0.4 32
[r4-LoopBack0]int lo1
[r4-LoopBack1]ip add 172.16.4.1 24
[r4-LoopBack1]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 172.16.1.6 30
Aug  6 2022 21:12:39-08:00 r4 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state. 
[r4-GigabitEthernet0/0/0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 172.16.1.9 30

R5

[Huawei]sys r5
[r5]int lo0
[r5-LoopBack0]ip add 172.16.0.5 32
[r5-LoopBack0]int lo1
[r5-LoopBack1]ip add 172.16.5.1 24
[r5-LoopBack1]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 172.16.1.17 30
Aug  6 2022 21:16:15-08:00 r5 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state. 
[r5-GigabitEthernet0/0/0]int g0/0/1
[r5-GigabitEthernet0/0/1]ip add 172.16.1.22 30

R6

[r6]int lo0
[r6-LoopBack0]ip add 172.16.0.6 32
[r6-LoopBack0]int lo1
[r6-LoopBack1]ip add 172.16.6.1 24
[r6-LoopBack1]int g0/0/0
[r6-GigabitEthernet0/0/0]ip add 172.16.1.13 30
Aug  6 2022 21:15:14-08:00 r6 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state. 
[r6-GigabitEthernet0/0/0]int g0/0/1
[r6-GigabitEthernet0/0/1]ip add 172.16.1.18 30

R7

[r7]int lo0
[r7-LoopBack0]ip add 172.16.0.7 32
[r7-LoopBack0]int lo1
[r7-LoopBack1]ip add 172.16.7.1 24
[r7-LoopBack1]int g0/0/0
[r7-GigabitEthernet0/0/0]ip add 172.16.1.10 30
Aug  6 2022 21:13:47-08:00 r7 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP on the interface GigabitEthernet0/0/0 has entered the UP state. 
[r7-GigabitEthernet0/0/0]int g0/0/1
[r7-GigabitEthernet0/0/1]ip add 172.16.1.14 30
Aug  6 2022 21:14:08-08:00 r7 %%01IFNET/4/LINK_STATE(l)[1]:The line protocol IP on the interface GigabitEthernet0/0/1 has entered the UP state. 
[r7-GigabitEthernet0/0/1]int g0/0/2
[r7-GigabitEthernet0/0/2]ip add 78.1.1.1 24

R8

[r8]int lo0
[r8-LoopBack0]ip add 8.8.8.8 24
[r8-LoopBack0]int g0/0/0
[r8-GigabitEthernet0/0/0]ip add 78.1.1.2 24

地址配置完成,在整个AS2区域内起ospf 协议 。
使用ospf协议跑通AS2,进行互相建邻居。
R2

[r2]ospf 1
[r2-ospf-1]a 0
[r2-ospf-1-area-0.0.0.0]net
[r2-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R3

[r3]ospf 1
[r3-ospf-1]a 0
[r3-ospf-1-area-0.0.0.0]net
[r3-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R4

[r4]ospf 1
[r4-ospf-1]a 0
[r4-ospf-1-area-0.0.0.0]net
[r4-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

剩下的配置都是相同的,因为AS 2中的ip地址都是基于172.16.0.0/16划分所得的。
然后
简单的检查一下ospf建立邻居的情况

[r2]display ospf peer brief 

         OSPF Process 1 with Router ID 172.16.0.2
                  Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.0          GigabitEthernet0/0/1             172.16.0.3       Full        
 0.0.0.0          GigabitEthernet0/0/2             172.16.0.5       Full        
 ----------------------------------------------------------------------------
display ospf peer brief 

         OSPF Process 1 with Router ID 172.16.0.5
                  Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.0          GigabitEthernet0/0/0             172.16.0.6       Full        
 0.0.0.0          GigabitEthernet0/0/1             172.16.0.2       Full        
 ----------------------------------------------------------------------------

邻居关系建立无误
接着,开始建立BGP对等体关系
R1,2和R7,8之间为了方便,采用直连建邻,用环回建邻也可以
R1,2

[r1]bgp 1
[r1-bgp]router
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as
[r1-bgp]peer 12.1.1.2 as-number 2
[r2]bgp 64512
[r2-bgp]router
[r2-bgp]router-id 2.2.2.2
[r2-bgp]con
[r2-bgp]confederation id 2
[r2-bgp]peer 12.1.1.1 as
[r2-bgp]peer 12.1.1.1 as-number 1

R7,8与R1,2之间建立方法一致
AS2之间的bgp对等体关系
R2

[r2]
[r2]bgp 64512
[r2-bgp]peer 172.16.0.3 as
[r2-bgp]peer 172.16.0.3 as-number 64512
[r2-bgp]peer 172.16.0.3 connect-interface LoopBack 0
[r2-bgp]peer 172.16.0.3 ne
[r2-bgp]peer 172.16.0.3 next-hop-invariable
[r2-bgp]peer 172.16.0.3 next-hop-local
[r2]bgp 64512
[r2-bgp]peer 172.16.0.4 as
[r2-bgp]peer 172.16.0.4 as-number 64512
[r2-bgp]peer 172.16.0.4 connect-interface LoopBack 0
[r2-bgp]peer 172.16.0.4 ne
[r2-bgp]peer 172.16.0.4 next-hop-invariable
[r2-bgp]peer 172.16.0.4 next-hop-local
[r2]bgp 64512
[r2-bgp]confederation  id 2
[r2-bgp]conf
[r2-bgp]confederation peer
[r2-bgp]confederation peer-as 64513
[r2-bgp]peer 172.16.0.5 as
[r2-bgp]peer 172.16.0.5 as-number 64513
[r2-bgp]peer 172.16.0.5 con
[r2-bgp]peer 172.16.0.5 connect-interface lo
[r2-bgp]peer 172.16.0.5 connect-interface LoopBack 0
[r2-bgp]peer 172.16.0.5 ne
[r2-bgp]peer 172.16.0.5 ebg                
[r2-bgp]peer 172.16.0.5 ebgp-max-hop 2
[r2-bgp]peer 172.16.0.5 ne
[r2-bgp]peer 172.16.0.5 next-hop-invariable
[r2-bgp]peer 172.16.0.5 next-hop-local

R3

[r3]bgp 64512
[r3-bgp]router
[r3-bgp]router-id 3.3.3.3
[r3-bgp]con
[r3-bgp]confederation id 2
[r3-bgp]peer 172.16.0.2 as
[r3-bgp]peer 172.16.0.2 as-number 64512
[r3-bgp]peer 172.16.0.2 con
[r3-bgp]peer 172.16.0.2 connect-interface lo
[r3-bgp]peer 172.16.0.2 connect-interface LoopBack 0
[r3-bgp]peer 172.16.0.2 ne
[r3-bgp]peer 172.16.0.2 next-hop-invariable
[r3-bgp]peer 172.16.0.2 next-hop-local

R4

[r4]bgp 64512
[r4-bgp]router
[r4-bgp]router-id 4.4.4.4
[r4-bgp]con
[r4-bgp]confederation id 2
[r4-bgp]peer 172.16.0.2 as
[r4-bgp]peer 172.16.0.2 as-number 64512
[r4-bgp]peer 172.16.0.2 con
[r4-bgp]peer 172.16.0.2 connect-interface lo
[r4-bgp]peer 172.16.0.2 connect-interface LoopBack 0
[r4-bgp]peer 172.16.0.2 ne
[r4-bgp]peer 172.16.0.2 next-hop-invariable
[r4-bgp]peer 172.16.0.2 next-hop-local
[r4]bgp 64512
[r4-bgp]con
[r4-bgp]confederation id 2
[r4-bgp]con
[r4-bgp]confederation peer
[r4-bgp]confederation peer-as 64513
[r4-bgp]peer 172.16.0.7 as
[r4-bgp]peer 172.16.0.7 as-number 64513
[r4-bgp]peer 172.16.0.7 con
[r4-bgp]peer 172.16.0.7 connect-interface lo
[r4-bgp]peer 172.16.0.7 connect-interface LoopBack 0
[r4-bgp]peer 172.16.0.7 eb
[r4-bgp]peer 172.16.0.7 ebgp-max-hop 2
[r4-bgp]peer 172.16.0.7 ne
[r4-bgp]peer 172.16.0.7 next-hop-invariable
[r4-bgp]peer 172.16.0.7 next-hop-local

R5

[r5]bgp 64513
[r5-bgp]router
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 172.16.0.6 as
[r5-bgp]con                       
[r5-bgp]confederation id 2
[r5-bgp]peer 172.16.0.6 as
[r5-bgp]peer 172.16.0.6 as-number 64513
[r5-bgp]peer 172.16.0.6 con
[r5-bgp]peer 172.16.0.6 connect-interface lo
[r5-bgp]peer 172.16.0.6 connect-interface LoopBack 0
[r5-bgp]peer 172.16.0.6 ne
[r5-bgp]peer 172.16.0.6 next-hop-invariable
[r5-bgp]peer 172.16.0.6 next-hop-local
[r5-bgp]peer 172.16.0.7 as
[r5-bgp]peer 172.16.0.7 as-number 64513
[r5-bgp]peer 172.16.0.7 con
[r5-bgp]peer 172.16.0.7 connect-interface lo
[r5-bgp]peer 172.16.0.7 connect-interface LoopBack  0
[r5-bgp]peer 172.16.0.7 ne
[r5-bgp]peer 172.16.0.7 next-hop-invariable
[r5-bgp]peer 172.16.0.7 next-hop-local
[r5]bgp 64513
[r5-bgp]con
[r5-bgp]confederation id 2
[r5-bgp]con
[r5-bgp]confederation peer
[r5-bgp]confederation peer-as 64512
[r5-bgp]peer 172.16.0.2 as
[r5-bgp]peer 172.16.0.2 as-number 64512
[r5-bgp]peer 172.16.0.2 con
[r5-bgp]peer 172.16.0.2 connect-interface lo
[r5-bgp]peer 172.16.0.2 connect-interface LoopBack 0
[r5-bgp]peer 172.16.0.2 eb
[r5-bgp]peer 172.16.0.2 ebgp-max-hop 2
[r5-bgp]peer 172.16.0.2 ne
[r5-bgp]peer 172.16.0.2 next-hop-invariable
[r5-bgp]peer 172.16.0.2 next-hop-local

R6

[r6]bgp 64513
[r6-bgp]router
[r6-bgp]router-id 6.6.6.6
[r6-bgp]con
[r6-bgp]confederation id 2
[r6-bgp]peer 172.16.0.5 as
[r6-bgp]peer 172.16.0.5 as-number 64513
[r6-bgp]peer 172.16.0.7 as
[r6-bgp]peer 172.16.0.7 as-path-filter
[r6-bgp]peer 172.16.0.5 con            
[r6-bgp]peer 172.16.0.5 connect-interface 
[r6-bgp]peer 172.16.0.5 connect-interface lo
[r6-bgp]peer 172.16.0.5 connect-interface LoopBack 0
[r6-bgp]peer 172.16.0.5 ne
[r6-bgp]peer 172.16.0.5 next-hop-invariable
[r6-bgp]peer 172.16.0.5 next-hop-local

R7

[r7]bgp 64513
[r7-bgp]con
[r7-bgp]router        
[r7-bgp]router-id 7.7.7.7
[r7-bgp]con
[r7-bgp]confederation id 2
[r7-bgp]peer 172.16.0.5 as
[r7-bgp]peer 172.16.0.5 as-number 64513
[r7-bgp]peer 172.16.0.5 con
[r7-bgp]peer 172.16.0.5 connect-interface lo
[r7-bgp]peer 172.16.0.5 connect-interface LoopBack 0
[r7-bgp]peer 172.16.0.5 ne
[r7-bgp]peer 172.16.0.5 next-hop-invariable
[r7-bgp]peer 172.16.0.5 next-hop-local
[r7-bgp]peer 78.1.1.2 as
[r7-bgp]peer 78.1.1.2 as-number 3
[r7]bgp 64513
[r7-bgp]con
[r7-bgp]confederation id 2
[r7-bgp]con
[r7-bgp]confederation peer
[r7-bgp]confederation peer-as 64512
[r7-bgp]peer 172.16.0.4 as
[r7-bgp]peer 172.16.0.4 as-number 64512
[r7-bgp]peer 172.16.0.4 con
[r7-bgp]peer 172.16.0.4 connect-interface lo
[r7-bgp]peer 172.16.0.4 connect-interface LoopBack 0
[r7-bgp]peer 172.16.0.4 eb
[r7-bgp]peer 172.16.0.4 ebgp-max-hop 2
[r7-bgp]peer 172.16.0.4 ne
[r7-bgp]peer 172.16.0.4 next-hop-invariable
[r7-bgp]peer 172.16.0.4 next-hop-local

在R3和R6上做一个发射器,不然无法传递路由
R3

[r3]bgp 64512
[r3-bgp]con
[r3-bgp]confederation id 2
[r3-bgp]peer 172.16.0.2 re
[r3-bgp]peer 172.16.0.2 reflect-client 

R6

[r6]bgp 64513
[r6-bgp]peer 172.16.0.5 reflect-client 

简单的检查一些bgp邻居的建立情况

[r7-bgp]display bgp peer

 BGP local router ID : 7.7.7.7
 Local AS number : 64513
 Total number of peers : 3                Peers in established state : 3

  Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State PrefRcv

  78.1.1.2        4           3       12       14     0 00:10:40 Established       0
  172.16.0.4      4       64512        2        2     0 00:00:43 Established       0
  172.16.0.5      4       64513       13       13     0 00:11:52 Established       0
[r2-bgp]display bgp peer

 BGP local router ID : 2.2.2.2
 Local AS number : 64512
 Total number of peers : 3                Peers in established state : 3

  Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State PrefRcv

  12.1.1.1        4           1       14       14     0 00:12:21 Established       0
  172.16.0.3      4       64512        2        2     0 00:00:26 Established       0
  172.16.0.4      4       64512        7        7     0 00:05:08 Established       0

我们可以发现,bgp邻居建立关系没有问题
我们可以在R1 和R8 上宣告一条路由
R1

[r1]bgp 1
[r1-bgp]net
[r1-bgp]network 1.1.1.0 24

R8

[r8]bgp 3
[r8-bgp]net
[r8-bgp]network 8.8.8.0 24

在其他路由器上 查看是否有这些路由
R2

display bgp routing-table 

 BGP Local router ID is 2.2.2.2 
 Status codes: * - valid, > - best, d - damped,
               h - history,  i - internal, s - suppressed, S - Stale
               Origin : i - IGP, e - EGP, ? - incomplete


 Total Number of Routes: 2
      Network            NextHop        MED        LocPrf    PrefVal Path/Ogn

 *>   1.1.1.0/24         12.1.1.1        0                     0      1i
 *>i  8.8.8.0/24         172.16.0.7      0          100        0      (64513) 3i

R4

[r4-bgp]display bgp routing-table 

 BGP Local router ID is 4.4.4.4 
 Status codes: * - valid, > - best, d - damped,
               h - history,  i - internal, s - suppressed, S - Stale
               Origin : i - IGP, e - EGP, ? - incomplete


 Total Number of Routes: 3
      Network            NextHop        MED        LocPrf    PrefVal Path/Ogn

 *>i  1.1.1.0/24         172.16.0.2      0          100        0      1i
 *>i  8.8.8.0/24         172.16.0.7      0          100        0      (64513) 3i
 * i                     172.16.0.7      0          100        0      (64513) 3i

为了R1能ping通各个路由器的用户网段,我们需要将他们的用户网段进行宣告
查看他们的路由表
R4

display ip routing-table 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 30       Routes : 32       

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        1.1.1.0/24  IBGP    255  0          RD   172.16.0.2      GigabitEthernet0/0/0
        8.8.8.0/24  IBGP    255  0          RD   172.16.0.7      GigabitEthernet0/0/1
      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
127.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0
     172.16.0.2/32  OSPF    10   2           D   172.16.1.5      GigabitEthernet0/0/0
     172.16.0.3/32  OSPF    10   1           D   172.16.1.5      GigabitEthernet0/0/0
     172.16.0.4/32  Direct  0    0           D   127.0.0.1       LoopBack0
     172.16.0.5/32  OSPF    10   3           D   172.16.1.5      GigabitEthernet0/0/0
                    OSPF    10   3           D   172.16.1.10     GigabitEthernet0/0/1
     172.16.0.6/32  OSPF    10   2           D   172.16.1.10     GigabitEthernet0/0/1
     172.16.0.7/32  OSPF    10   1           D   172.16.1.10     GigabitEthernet0/0/1
     172.16.1.0/30  OSPF    10   2           D   172.16.1.5      GigabitEthernet0/0/0
     172.16.1.4/30  Direct  0    0           D   172.16.1.6      GigabitEthernet0/0/0
     172.16.1.6/32  Direct  0    0           D   127.0.0.1       GigabitEthernet0/0/0
     172.16.1.7/32  Direct  0    0           D   127.0.0.1       GigabitEthernet0/0/0
     172.16.1.8/30  Direct  0    0           D   172.16.1.9      GigabitEthernet0/0/1
     172.16.1.9/32  Direct  0    0           D   127.0.0.1       GigabitEthernet0/0/1
    172.16.1.11/32  Direct  0    0           D   127.0.0.1       GigabitEthernet0/0/1
    172.16.1.12/30  OSPF    10   2           D   172.16.1.10     GigabitEthernet0/0/1
    172.16.1.16/30  OSPF    10   3           D   172.16.1.10     GigabitEthernet0/0/1
    172.16.1.20/30  OSPF    10   3           D   172.16.1.5      GigabitEthernet0/0/0
     172.16.2.1/32  OSPF    10   2           D   172.16.1.5      GigabitEthernet0/0/0
     172.16.3.1/32  OSPF    10   1           D   172.16.1.5      GigabitEthernet0/0/0
     172.16.4.0/24  Direct  0    0           D   172.16.4.1      LoopBack1
     172.16.4.1/32  Direct  0    0           D   127.0.0.1       LoopBack1
   172.16.4.255/32  Direct  0    0           D   127.0.0.1       LoopBack1
     172.16.5.1/32  OSPF    10   3           D   172.16.1.5      GigabitEthernet0/0/0
  ---- More ----

我们可以发现 他们的用户网段都是为32 位的
那是因为在ospf中宣告的环回都是为32 位
我们需要将他们改为24位,只需要将接口类型修改为broadcast
R7

[r7]int lo0
[r7-LoopBack0]ospf net
[r7-LoopBack0]ospf network-type b
[r7-LoopBack0]ospf network-type broadcast 

R3

[r3]int lo0
[r3-LoopBack0]ospf net
[r3-LoopBack0]ospf network-type b
[r3-LoopBack0]ospf network-type broadcast 

其余的修改都是一样的
再次查看路由表发现都已经修改为24位了
接着在进行宣告
R2上

[r2]bgp 64512
[r2-bgp]net
[r2-bgp]network 172.16.2.0 24

用R1来pingR2的用户网段

ping -a 1.1.1.1 172.16.2.1
  PING 172.16.2.1: 56  data bytes, press CTRL_C to break
    Reply from 172.16.2.1: bytes=56 Sequence=1 ttl=255 time=30 ms
    Reply from 172.16.2.1: bytes=56 Sequence=2 ttl=255 time=10 ms
    Reply from 172.16.2.1: bytes=56 Sequence=3 ttl=255 time=20 ms
    Reply from 172.16.2.1: bytes=56 Sequence=4 ttl=255 time=20 ms
    Reply from 172.16.2.1: bytes=56 Sequence=5 ttl=255 time=20 ms

R1 ping R8


ping -a 1.1.1.1 8.8.8.8
  PING 8.8.8.8: 56  data bytes, press CTRL_C to break
    Reply from 8.8.8.8: bytes=56 Sequence=1 ttl=251 time=60 ms
    Reply from 8.8.8.8: bytes=56 Sequence=2 ttl=251 time=50 ms
    Reply from 8.8.8.8: bytes=56 Sequence=3 ttl=251 time=50 ms
    Reply from 8.8.8.8: bytes=56 Sequence=4 ttl=251 time=50 ms
    Reply from 8.8.8.8: bytes=56 Sequence=5 ttl=251 time=40 ms

  --- 8.8.8.8 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 40/50/60 ms

发现可以ping通
最后就进行路由汇总了
R2

[r1-bgp]aggregate 172.16.0.0 21 

先逐条宣告本地所有明细路由,在进行汇总,会自动生成空接口防环路由

最后 实验结束!

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