MSR路由器BGP4+路由反射器的配置

MSR路由器

BGP4+路由反射器的配置

 

关键字: MSR;IPv6;BGP4+; 路由反射

一、组网需求

    RouterB接收了一个经过EBGP的更新报文并将之传给RouterC。RouterC被配置为路由反射器，它有两个客户：RouterB和RouterD。RouterB和RouterD间不需一个IBGP连接，当RouterC接收了来自RouterB的路由更新时，它将此信息反射给RouterD，反之亦然。

试验设备：RTA（MSR20-21），RTB（MSR20-20）,RTC（MSR30-20）,RTD（MSR30-20）

适用版本：Version 5.20, Beta 1105

二、组网图

      

图 1 BGP4+路由反射组网图

三、配置步骤

   

RouterA配置

#  ipv6 # interface Ethernet0/1  port link-mode route  ipv6 address 1::1/96 # interface NULL0 # interface LoopBack0  ipv6 address 1:1:1::1/128 #               bgp 100  undo synchronization  #  ipv6-family //发布该网段的路由，此处为loopback0地址  network 1:1:1::1 128  undo synchronization  //与对端建立EBGP连接  peer 1::2 as-number 200

RouterB配置

#  ipv6 # interface Ethernet0/0  port link-mode route  ipv6 address 2::1/96 # interface Ethernet0/1  port link-mode route  ipv6 address 1::2/96 # interface LoopBack0  ipv6 address 2:2:2::2/128 # bgp 200 undo synchronization # ipv6-family    network 2:2:2::2 128 //引入直连路由以保证下一跳路由可达 import-route direct  undo synchronization //注意：此处并未将Router D加入对等体 peer 1::1 as-number 100 peer 2::2 as-number 200

RouterC配置

#  ipv6 # interface LoopBack0  ipv6 address 3:3:3::3/128 # interface GigabitEthernet0/0  port link-mode route  ipv6 address 2::2/96 # interface GigabitEthernet0/1  port link-mode route  ipv6 address 3::1/96 //BGP部分配置 # bgp 200 undo synchronization #              ipv6-family network 3:3:3::3 128 import-route direct undo synchronization group alanker internal //设定组内的对等体都为反射器的客户端 peer alanker reflect-client peer 2::1 group alanker peer 3::2 group alanker

RouterD配置

#  ipv6 # interface LoopBack0  ipv6 address 4:4:4::4/128 # interface GigabitEthernet0/0  port link-mode route  ipv6 address 3::2/96  ip address 1.0.0.4 255.255.255.0 # interface GigabitEthernet0/1  port link-mode route # bgp 200 undo synchronization # ipv6-family network 4:4:4::4 128 import-route direct undo synchronization peer 3::1 as-number 200

 

四、配置关键点

1．作为反射client的RouterB、D上无需配reflect-client，这些都是要在反射器routerC上配的

2．需要在边界路由器RouterB与RouterC上引入直连路由，否则在ping 1:1:1::1地址的时候找不到下一跳1::1, 即无法到达BGP路由表中的下一跳。因为边界路由器在向IBGP发布路由的时候不改变该条路由的下一跳。

 

五、试验分析

 

    1.     在RouterA上再配置一个loopback地址：2001：da8::1, 并在BGP视图下用如下命

       令使能：（红色部分）

[RouterA-2021-bgp-af-ipv6]dis th

#

 ipv6-family

  network 1:1:1::1 128

  network 2001:DA8::1 128

  undo synchronization

  peer 1::2 as-number 200

 

此时在RouterB与RouterD的BGP路由表中均有到达该地址的路由，

<RouterB-2020>display bgp ipv6 routing-table

 

 Total Number of Routes: 9

 

 BGP Local router ID is 1.0.0.2

 Status codes: * - valid, > - best, d - damped,

               h - history,  i - internal, s - suppressed, S - Stale

               Origin : i - IGP, e - EGP, ? - incomplete

 

 *>  Network : 1::                                 PrefixLen : 96    

     NextHop : 1::2                                LocPrf    :         

     PrefVal : 0                                   Label     : NULL     

     MED     : 0                                       

     Path/Ogn: ?

 

 *>  Network : 1:1:1::1                           PrefixLen : 128   

     NextHop : 1::1                               LocPrf    :         

     PrefVal : 0                                 Label     : NULL     

     MED     : 0                                        

     Path/Ogn: 100 i

 

 *>  Network : 2::                                PrefixLen : 96    

     NextHop : 2::1                               LocPrf    :         

     PrefVal : 0                                  Label     : NULL     

     MED     : 0                                       

     Path/Ogn: ?

 

 * i Network : 2::                                PrefixLen : 96    

     NextHop : 2::2                               LocPrf    : 100      

     PrefVal : 0                                  Label     : NULL     

     MED     : 0                                       

     Path/Ogn:  ?

 

 *>  Network : 2:2:2::2                          PrefixLen : 128   

     NextHop : ::1                                LocPrf    :         

     PrefVal : 0                                   Label     : NULL     

     MED     : 0                                       

     Path/Ogn: i

 

 *>i Network : 3::                                PrefixLen : 96    

     NextHop : 2::2                               LocPrf    : 100      

     PrefVal : 0                                  Label     : NULL     

     MED     : 0                                       

     Path/Ogn:  ?

 

 *>i Network : 3:3:3::3                           PrefixLen : 128   

     NextHop : 2::2                               LocPrf    : 100      

     PrefVal : 0                                  Label     : NULL     

     MED     : 0                                       

     Path/Ogn:  i

 

 *>i Network : 4:4:4::4                            PrefixLen : 128   

     NextHop : 3::2                                LocPrf    : 100      

     PrefVal : 0                                   Label     : NULL     

     MED     : 0                                       

     Path/Ogn:  i

 

 *>  Network : 2001:DA8::1                       PrefixLen : 128   

     NextHop : 1::1                              LocPrf    :         

     PrefVal : 0                                 Label     : NULL     

     MED     : 0                                       

     Path/Ogn: 100 i

 

从D上可以ping通该地址，结果如下：

    <RouterD-3020>ping ipv6 2001:da8::1

  PING 2001:da8::1 : 56  data bytes, press CTRL_C to break

    Reply from 2001:DA8::1

    bytes=56 Sequence=1 hop limit=62  time = 3 ms

    Reply from 2001:DA8::1

    bytes=56 Sequence=2 hop limit=62  time = 3 ms

    Reply from 2001:DA8::1

    bytes=56 Sequence=3 hop limit=62  time = 3 ms

    Reply from 2001:DA8::1

    bytes=56 Sequence=4 hop limit=62  time = 4 ms

    Reply from 2001:DA8::1

    bytes=56 Sequence=5 hop limit=62  time = 3 ms

 

  --- 2001:da8::1 ping statistics ---

    5 packet(s) transmitted

    5 packet(s) received

    0.00% packet loss

    round-trip min/avg/max = 3/3/4 ms