1）在AS100内先完成环路【R1和R4建立IBGP邻居，在R1引入EBGP和IBGP】

实验BGP路由黑洞：

R1与R4 建立iBGP邻居

R1：

router bgp 100

 neighbor 44.1.1.1 remote-as 100             //指定44.1.1.1为其邻居  as号码为100

 neighbor 44.1.1.1 update-source Loopback0   //指定44.1.1.1更新源为loopback0

 R4:

router bgp 100

 neighbor 11.1.1.1 remote-as 100             //指定11.1.1.1为其邻居  as号码为100

 neighbor 11.1.1.1 update-source Loopback0   //指定11.1.1.1更新源为loopback0

 R4#show ip bgp summary                      //查看BGP邻居状态

BGP router identifier 44.1.1.1, local AS number 100

BGP table version is 13, main routing table version 13

5 network entries using 720 bytes of memory

5 path entries using 420 bytes of memory

3/3 BGP path/bestpath attribute entries using 480 bytes of memory

1 BGP AS-PATH entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1644 total bytes of memory

BGP activity 7/2 prefixes, 7/2 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

11.1.1.1        4          100     432     430       13    0    0 06:29:00        3

R1：ospf引入BGP路由

router bgp 100

bgp redistribute-internal      //使能 内部BGP(iBGP)路由重分发到IGP

router ospf 110

 redistribute bgp 100 subnets  //在ospf进程下引入BGP路由

 在R5上使用业务地址进行测试：

 R5#traceroute 4.4.4.4 source 5.5.5.5

Type escape sequence to abort.

Tracing the route to 4.4.4.4

VRF info: (vrf in name/id, vrf out name/id)

  1 10.1.15.1 1 msec 0 msec 1 msec

  2 10.1.13.3 0 msec 1 msec 0 msec

  3 10.1.13.1 1 msec 0 msec 0 msec

  4 10.1.13.3 1 msec 0 msec 1 msec

  5 10.1.13.1 0 msec 1 msec 0 msec

  6 10.1.13.3 1 msec 0 msec 1 msec

  7 10.1.13.1 0 msec 1 msec 0 msec

  8 10.1.13.3 1 msec 1 msec 0 msec

  9 10.1.13.1 1 msec 0 msec 1 msec

 10 10.1.13.3 1 msec 0 msec 0 msec

 11 10.1.13.1 1 msec 1 msec 1 msec

 12 10.1.13.3 1 msec 1 msec 1 msec

 13 10.1.13.1 1 msec 1 msec 1 msec

 14 10.1.13.3 1 msec 1 msec 1 msec

 15 10.1.13.1 1 msec 1 msec 1 msec

 16 10.1.13.3 1 msec 1 msec 1 msec

 17 10.1.13.1 1 msec 1 msec 1 msec

 18 10.1.13.3 1 msec 1 msec 2 msec

 19 10.1.13.1 1 msec 1 msec 1 msec

 20 10.1.13.3 2 msec 1 msec 1 msec

 21 10.1.13.1 3 msec 1 msec 2 msec

 22 10.1.13.3 1 msec 2 msec 1 msec

 23 10.1.13.1 2 msec 2 msec 2 msec

 24 10.1.13.3 2 msec 2 msec 1 msec

 25 10.1.13.1 2 msec 1 msec 1 msec

 26 10.1.13.3 2 msec 2 msec 2 msec

 27 10.1.13.1 3 msec 2 msec 2 msec

 28 10.1.13.3 1 msec 2 msec 1 msec

 29 10.1.13.1 2 msec 2 msec 2 msec

 30 10.1.13.3 1 msec 2 msec 2 msec

2）去掉R1的引入，在AS100内的R1、R2上部署对等组，完成全互联

实验BGP全互联：

R1：

router bgp 100

 bgp router-id 1.1.1.1

 bgp log-neighbor-changes

 network 1.1.1.1 mask 255.255.255.255

 neighbor miqi peer-group               //创建名称为miqi的对等组模板

 neighbor miqi remote-as 100            //指定miqi对等组模板的as号码为100

 neighbor miqi update-source Loopback0  //指定miqi对等组使用loopbakc0为更新源

 neighbor miqi next-hop-self            //指定miqi对等组 邻居从R1学到的路由 next-hop为R1

 neighbor 10.1.15.5 remote-as 200

 neighbor 22.1.1.1 peer-group miqi      //指定邻居调用miqi对等体组

 neighbor 33.1.1.1 peer-group miqi      //指定邻居调用miqi对等体

 neighbor 44.1.1.1 peer-group miqi      //指定邻居调用miqi对等体

 R1#show ip bgp summary                       //查看BGP邻居

BGP router identifier 1.1.1.1, local AS number 100

BGP table version is 16, main routing table version 16

7 network entries using 1008 bytes of memory

7 path entries using 588 bytes of memory

4/4 BGP path/bestpath attribute entries using 640 bytes of memory

1 BGP AS-PATH entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 2260 total bytes of memory

BGP activity 11/4 prefixes, 11/4 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

10.1.15.5       4          200      33      38       16    0    0 00:26:45        2

22.1.1.1        4          100      12      14       16    0    0 00:05:26        2

33.1.1.1        4          100       8      11       16    0    0 00:04:05        0

44.1.1.1        4          100     444     445       16    0    0 06:41:12        2

 R2：

 router bgp 100

 bgp router-id 2.2.2.2

 bgp log-neighbor-changes

 network 2.2.2.2 mask 255.255.255.255

 neighbor miqi peer-group                //创建名称为miqi的对等组模板

 neighbor miqi remote-as 100             //指定miqi对等组模板的as号码为100

 neighbor miqi update-source Loopback0   //指定miqi对等组使用loopbakc0为更新源

 neighbor miqi next-hop-self             //指定miqi对等组 邻居从R2学到的路由 next-hop为R2

 neighbor 11.1.1.1 peer-group miqi        //指定邻居调用miqi对等体

 neighbor 33.1.1.1 peer-group miqi        //指定邻居调用miqi对等体

 neighbor 44.1.1.1 peer-group miqi        //指定邻居调用miqi对等体

 neighbor 66.1.1.1 remote-as 200

 neighbor 66.1.1.1 ebgp-multihop 2

 neighbor 66.1.1.1 update-source Loopback0

 R2#show ip bgp summary                       //查看BGP邻居

BGP router identifier 2.2.2.2, local AS number 100

BGP table version is 21, main routing table version 21

7 network entries using 1008 bytes of memory

7 path entries using 588 bytes of memory

4/4 BGP path/bestpath attribute entries using 640 bytes of memory

1 BGP AS-PATH entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 2260 total bytes of memory

BGP activity 12/5 prefixes, 12/5 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

11.1.1.1        4          100      14      12       21    0    0 00:06:08        3

33.1.1.1        4          100      11      13       21    0    0 00:04:31        0

44.1.1.1        4          100      11      12       21    0    0 00:03:43        2

66.1.1.1        4          200     444     450       21    0    0 06:42:00        1

3）AS100的业务接口可以5.5.5.5通信

全互联后测试as100内路由器的业务口是否都可以与5.5.5.5通信

R1：

R1#ping 5.5.5.5 source 1.1.1.1           //测试业务是否可以与5.5.5.5通讯

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:

Packet sent with a source address of 1.1.1.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

R2：

R2#ping 5.5.5.5 source 2.2.2.2           //测试业务是否可以与5.5.5.5通讯

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:

Packet sent with a source address of 2.2.2.2

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

R3：

R3#  ping 5.5.5.5 source 3.3.3.3           //测试业务是否可以与5.5.5.5通讯

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:

Packet sent with a source address of 3.3.3.3

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

R4：

R4#ping 5.5.5.5 source 4.4.4.4            //测试业务是否可以与5.5.5.5通讯

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:

Packet sent with a source address of 4.4.4.4

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms