需求：
1、每个设备存在两个环回接口
a.一个接口使用设备编号创建环回，掩码为32
示例：R1的环回为1.1.1.1/32
该环回用来建立BGP对等体关系或者作为BGP Router-ID使用
b.另一个环回接口使用设备编号创建，地址为192.168.X.0/24
示例：R1的环回为192.168.1.0/24
该环回用来模拟用户网段，节省拓扑图中的Pc数量
c.其余网段自行规划
2、所有设备启动BGP协议
原因：避免BGP路由黑洞问题
3、在一个AS内部，建立全连接的IBGP对等体关系
原因：避免IBGP水平分割问题带来的路由传递故障
4、按照图示建立EBGP对等体和IBGP对等体关系
5、BGP仅传递用于模拟用户网段的接口路由信息
6、AS内部如有需要，自行选择IGP协议进行运行
7、实现所有模拟PC的环回接口之间相互通讯
配置物理IP地址和环回IP地址
R1： [R1-LoopBack0]ip address 1.1.1.1 32 [R1-LoopBack1]ip address 192.168.1.1 24 [R1-GigabitEthernet0/0/0]ip address 12.0.0.1 24 [R1-GigabitEthernet0/0/1]ip address 13.0.0.1 24 R2： [R2-LoopBack0]ip address 2.2.2.2 32 [R2-LoopBack1]ip address 192.168.2.1 24 [R2-LoopBack1]ospf network-type broadcast --- 模拟用户网段 [R2-GigabitEthernet0/0/0]ip address 12.0.0.2 24 [R2-GigabitEthernet0/0/1]ip address 24.0.0.2 24 R3： [R3-LoopBack0]ip address 3.3.3.3 32 [R3-LoopBack1]ip address 192.168.3.1 24 [R3-LoopBack1]ospf network-type broadcast [R3-GigabitEthernet0/0/0]ip address 13.0.0.3 24 [R3-GigabitEthernet0/0/1]ip address 34.0.0.3 24 [R3-GigabitEthernet0/0/2]ip address 36.0.0.3 24 R4： [R4-LoopBack0]ip address 4.4.4.4 32 [R4-LoopBack1]ip address 192.168.4.1 24 [R4-LoopBack1]ospf network-type broadcast [R4-GigabitEthernet0/0/0]ip address 24.0.0.4 24 [R4-GigabitEthernet0/0/1]ip address 34.0.0.4 24 [R4-GigabitEthernet0/0/2]ip address 45.0.0.4 24 [R4-GigabitEthernet1/0/0]ip address 47.0.0.4 24 R5： [R5-LoopBack0]ip address 5.5.5.5 32 [R5-LoopBack1]ip address 192.168.5.1 24 [R5-GigabitEthernet0/0/0]ip address 45.0.0.5 24 R6： [R6-LoopBack0]ip address 6.6.6.6 32 [R6-LoopBack1]ip address 192.168.6.1 24 [R6-GigabitEthernet0/0/0]ip address 36.0.0.6 24 [R6-GigabitEthernet0/0/1]ip address 67.0.0.6 24 [R6-GigabitEthernet0/0/2]ip address 69.0.0.6 24 R7： [R7-LoopBack0]ip address 7.7.7.7 32 [R7-LoopBack1]ip address 192.168.7.1 24 [R7-GigabitEthernet0/0/0]ip address 47.0.0.7 24 [R7-GigabitEthernet0/0/1]ip address 67.0.0.7 24 [R7-GigabitEthernet0/0/2]ip address 78.0.0.7 24 [R7-GigabitEthernet1/0/0]ip address 107.0.0.7 24 R8： [R8-LoopBack0]ip address 8.8.8.8 32 [R8-LoopBack1]ip address 192.168.8.1 24 [R8-GigabitEthernet0/0/0]ip address 78.0.0.8 24 R9： [R9-LoopBack0]ip address 9.9.9.9 32 [R9-LoopBack1]ip address 192.168.9.1 24 [R9-LoopBack1]ospf network-type broadcast [R9-GigabitEthernet0/0/0]ip address 69.0.0.9 24 [R9-GigabitEthernet0/0/1]ip address 109.0.0.9 24 R10： [R10-LoopBack0]ip address 10.10.10.10 32 [R10-LoopBack1]ip address 192.168.10.1 24 [R10-LoopBack1]ospf network-type broadcast [R10-GigabitEthernet0/0/0]ip address 107.0.0.10 24 [R10-GigabitEthernet0/0/1]ip address 109.0.0.10 24配置IGP（OSPF）
AS200： [R2]ospf 1 router-id 2.2.2.2 [R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0 [R2-ospf-1-area-0.0.0.0]network 24.0.0.2 0.0.0.0 [R2-ospf-1-area-0.0.0.0]network 192.168.2.1 0.0.0.0 [R3]ospf 1 router-id 3.3.3.3 [R3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0 [R3-ospf-1-area-0.0.0.0]network 192.168.3.1 0.0.0.0 [R3-ospf-1-area-0.0.0.0]network 34.0.0.3 0.0.0.0 [R4]ospf 1 router-id 4.4.4.4 [R4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0 [R4-ospf-1-area-0.0.0.0]network 192.168.4.1 0.0.0.0 [R4-ospf-1-area-0.0.0.0]network 24.0.0.4 0.0.0.0 [R4-ospf-1-area-0.0.0.0]network 34.0.0.4 0.0.0.0 AS 500： [R9]ospf 1 router-id 9.9.9.9 [R9-ospf-1-area-0.0.0.0]network 9.9.9.9 0.0.0.0 [R9-ospf-1-area-0.0.0.0]network 192.168.9.1 0.0.0.0 [R9-ospf-1-area-0.0.0.0]network 109.0.0.9 0.0.0.0 [R10]ospf 1 router-id 10.10.10.10 [R10-ospf-1-area-0.0.0.0]network 10.10.10.10 0.0.0.0 [R10-ospf-1-area-0.0.0.0]network 192.168.10.1 0.0.0.0 [R10-ospf-1-area-0.0.0.0]network 109.0.0.10 0.0.0.0配置BGP建立邻居
R1： [R1]bgp 100 [R1-bgp]router-id 1.1.1.1 [R1-bgp]peer 12.0.0.2 as-number 200 [R1-bgp]peer 13.0.0.3 as-number 200 R2： [R2]bgp 200 [R2-bgp]router-id 2.2.2.2 [R2-bgp]peer 12.0.0.1 as-number 100 [R2-bgp]peer 3.3.3.3 as-number 200 [R2-bgp]peer 3.3.3.3 connect-interface LoopBack 0 [R2-bgp]peer 4.4.4.4 as-number 200 [R2-bgp]peer 4.4.4.4 connect-interface LoopBack 0 R3： [R3]bgp 200 [R3-bgp]router-id 3.3.3.3 [R3-bgp]peer 13.0.0.1 as-number 100 [R3-bgp]peer 36.0.0.6 as-number 300 [R3-bgp]peer 2.2.2.2 as-number 200 [R3-bgp]peer 2.2.2.2 connect-interface LoopBack 0 [R3-bgp]peer 4.4.4.4 as-number 200 [R3-bgp]peer 4.4.4.4 connect-interface LoopBack 0 R4: [R4]bgp 200 [R4-bgp]router-id 4.4.4.4 [R4-bgp]peer 45.0.0.5 as-number 300 [R4-bgp]peer 47.0.0.7 as-number 400 [R4-bgp]peer 2.2.2.2 as-number 200 [R4-bgp]peer 2.2.2.2 connect-interface LoopBack 0 [R4-bgp]peer 3.3.3.3 as-number 200 [R4-bgp]peer 3.3.3.3 connect-interface LoopBack 0 R5: [R5]bgp 300 [R5-bgp]router-id 5.5.5.5 [R5-bgp]peer 45.0.0.4 as-number 200 R6: [R6]bgp 300 [R6-bgp]router-id 6.6.6.6 [R6-bgp]peer 36.0.0.3 as-number 200 [R6-bgp]peer 67.0.0.7 as-number 400 [R6-bgp]peer 69.0.0.9 as-number 500 R7: [R7]bgp 400 [R7-bgp]router-id 7.7.7.7 [R7-bgp]peer 47.0.0.4 as-number 200 [R7-bgp]peer 67.0.0.6 as-number 300 [R7-bgp]peer 78.0.0.8 as-number 500 [R7-bgp]peer 107.0.0.10 as-number 500 R8: [R8]bgp 500 [R8-bgp]router-id 8.8.8.8 [R8-bgp]peer 78.0.0.7 as-number 400 R9: [R9]bgp 500 [R9-bgp]router-id 9.9.9.9 [R9-bgp]peer 69.0.0.6 as-number 300 [R9-bgp]peer 10.10.10.10 as-number 500 [R9-bgp]peer 10.10.10.10 connect-interface LoopBack 0 R10: [R10]bgp 500 [R10-bgp]router-id 10.10.10.10 [R10-bgp]peer 107.0.0.7 as-number 400 [R10-bgp]peer 9.9.9.9 as-number 500 [R10-bgp]peer 9.9.9.9 connect-interface LoopBack 0路由发布
R1： [R1-bgp]network 192.168.1.0 24 R2： [R2]ip ip-prefix aa permit 192.168.0.0 16 greater-equal 24 less-equal 24 [R2]route-policy aa permit node 10 [R2-route-policy]if-match ip-prefix aa [R2]bgp 200 [R2-bgp]import-route ospf 1 route-policy aa R3： [R3]ip ip-prefix aa permit 192.168.0.0 16 greater-equal 24 less-equal 24 [R3]route-policy aa permit node 10 [R3]bgp 200 [R3-bgp]import-route ospf 1 route-policy aa R4： [R4]ip ip-prefix aa permit 192.168.0.0 16 greater-equal 24 less-equal 24 [R4]route-policy aa permit node 10 [R4-route-policy]if-match ip-prefix aa [R4]bgp 200 [R4-bgp]import-route ospf 1 route-policy aa R5: [R5]bgp 300 [R5-bgp]network 192.168.5.0 24 R6： [R6]bgp 300 [R6-bgp]network 192.168.6.0 24 R7： [R7]bgp 400 [R7-bgp]network 192.168.7.0 24 R8： [R8]bgp 500 [R8-bgp]network 192.168.8.0 24 R9： [R9]bgp 500 [R9-bgp]network 192.168.9.0 24 [R9-bgp]network 192.168.10.0 24 R10： [R10]bgp 500 [R10-bgp]network 192.168.9.0 24 [R10-bgp]network 192.168.10.0 24消除EBGP防环
[R10-bgp]peer 107.0.0.7 allow-as-loop 2 [R10-bgp]peer 9.9.9.9 allow-as-loop 2 [R9-bgp]peer 69.0.0.6 allow-as-loop 2 [R8-bgp]peer 78.0.0.7 allow-as-loop 2 [R5-bgp]peer 45.0.0.4 allow-as-loop 2 [R6-bgp]peer 36.0.0.3 allow-as-loop 2 [R6-bgp]peer 67.0.0.7 allow-as-loop 2 [R6-bgp]peer 69.0.0.9 allow-as-loop 2路由又有EBGP和IBGP要配置
[R10-bgp]peer 9.9.9.9 next-hop-local [R9-bgp]peer 10.10.10.10 next-hop-local [R2-bgp]peer 3.3.3.3 next-hop-local [R2-bgp]peer 4.4.4.4 next-hop-local [R3-bgp]peer 2.2.2.2 next-hop-local [R3-bgp]peer 4.4.4.4 next-hop-local [R4-bgp]peer 2.2.2.2 next-hop-local [R4-bgp]peer 3.3.3.3 next-hop-local全网可达
