配置BGP4+基本功能

如下图所示，在AS 1与AS 2中配置路由协议来实现互联；

配置接口IPv6地址：

[r1]ipv6
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ipv6 enable 
[r1-GigabitEthernet0/0/0]ipv6 address 1001::1/64

配置BGP4+：

[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 1001::2 as-number 2
[r1-bgp]ipv6-family unicast 
[r1-bgp-af-ipv6]peer 1001::2 enable 
[r1-bgp-af-ipv6]network 1001:: 64

[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 1001::1 as-number 1
[r2-bgp]peer 1002::2 as-number 2
[r2-bgp]ipv6-family unicast 
[r2-bgp-af-ipv6]peer 1001::1 enable 
[r2-bgp-af-ipv6]network 1001:: 64
[r2-bgp-af-ipv6]peer 1002::2 enable 
[r2-bgp-af-ipv6]network 1002:: 64

[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 1002::1 as-number 2
[r3-bgp]ipv6-family unicast 
[r3-bgp-af-ipv6]peer 1002::1 enable 
[r3-bgp-af-ipv6]network 1002:: 64

查询BGP4+邻居关系：

[r1]display bgp ipv6 peer 

 BGP local router ID : 1.1.1.1
 Local AS number : 1
 Total number of peers : 1                Peers in established state : 1

  Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State PrefRcv

  1001::2         4           2       12       11     0 00:08:33 Established       2

查询BGP4+路由信息：

[r1]display bgp ipv6 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: 3
 *>  Network  : 1001::                                   PrefixLen : 64     
     NextHop  : ::                                       LocPrf    :          
     MED      : 0                                        PrefVal   : 0         
     Label    : 
     Path/Ogn : i
                                              
     NextHop  : 1001::2                                  LocPrf    :          
     MED      : 0                                        PrefVal   : 0         
     Label    : 
     Path/Ogn : 2  i
 *>  Network  : 1002::                                   PrefixLen : 64     
     NextHop  : 1001::2                                  LocPrf    :          
     MED      : 0                                        PrefVal   : 0         
     Label    : 
     Path/Ogn : 2  i