HuaWei ❀ 配置BGP负载分担

配置BGP负载分担

如下图所示，四台路由器配置BGP协议，要求R1通过R2与R3共同访问R4；

配置接口IP地址：

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip address 12.1.1.1 24
配置类似，不做阐述；

配置BGP：

[r1]bgp 1   
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2
[r1-bgp]peer 13.1.1.2 as-number 2

[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.1.1.1 as-number 1
[r2-bgp]peer 24.1.1.2 as-number 3

[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 13.1.1.1 as-number 1
[r3-bgp]peer 34.1.1.2 as-number 3

[r4]bgp 3
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 24.1.1.1 as-number 2
[r4-bgp]peer 34.1.1.1 as-number 2

配置R4引入路由信息：

[r4-bgp]ipv4-family unicast 
[r4-bgp-af-ipv4]network 4.4.4.4 255.255.255.0

配置BGP负载分担：

[r1]bgp 1
[r1-bgp]ipv4-family unicast 
[r1-bgp-af-ipv4]maximum load-balancing ?
  INTEGER<1-8>  Specify maximum equal cost routes
  ebgp          EBGP routes as equal cost route
  ibgp          IBGP routes as equal cost route
[r1-bgp-af-ipv4]maximum load-balancing 2

查看配置结果：

[r1]display 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: 2
      Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
 *>   4.4.4.0/24         12.1.1.2                              0      2 3i
 *                       13.1.1.2                              0      2 3i

[r1]display ip routing-table protocol bgp 

Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Public routing table : BGP
         Destinations : 1        Routes : 2        
BGP routing table status : <Active>
         Destinations : 1        Routes : 2
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface
        4.4.4.0/24  EBGP    255  0           D   13.1.1.2        GigabitEthernet0/0/1
                    EBGP    255  0           D   12.1.1.2        GigabitEthernet0/0/0
BGP routing table status : <Inactive>
         Destinations : 0        Routes : 0

[r1]display bgp routing-table 4.4.4.4

 BGP local router ID : 1.1.1.1
 Local AS number : 1
 Paths:   2 available, 1 best, 2 select
 BGP routing table entry information of 4.4.4.0/24:
 From: 12.1.1.2 (2.2.2.2)
 Route Duration: 00h00m06s  
 Direct Out-interface: GigabitEthernet0/0/0
 Original nexthop: 12.1.1.2
 Qos information : 0x0
 AS-path 2 3, origin igp, pref-val 0, valid, external, best, select, active, pre 255
 Advertised to such 2 peers:
    12.1.1.2
    13.1.1.2
 BGP routing table entry information of 4.4.4.0/24:
 From: 13.1.1.2 (3.3.3.3)
 Route Duration: 00h00m06s  
 Direct Out-interface: GigabitEthernet0/0/1
 Original nexthop: 13.1.1.2
 Qos information : 0x0
 AS-path 2 3, origin igp, pref-val 0, valid, external, select, active, pre 255, not preferred for router ID
 Not advertised to any peer yet