网站 实施,网站建设公司宣传文案,wordpress 开发手册,昌邑微信网站建设公司实验拓扑 实验要求
实现通过修改AS-Path属性来影响路径选择实现通过修改Local_Preference属性来影响路径选择实现通过修改MED属性来影响路径选择实现通过修改preferred-value属性来影响路径选择
实验配置与效果
1.改名与IP配置
2.as300配置OSPF
R3已经学到R2和R4的路由 3.…实验拓扑 实验要求
实现通过修改AS-Path属性来影响路径选择实现通过修改Local_Preference属性来影响路径选择实现通过修改MED属性来影响路径选择实现通过修改preferred-value属性来影响路径选择
实验配置与效果
1.改名与IP配置
2.as300配置OSPF
R3已经学到R2和R4的路由 3.配置BGP
查看R4和R2确保全部peer成功建立值得注意的是由于ospf没有宣告AS300和其他两个区域间的信息在R2和R4上搭建10.0.3.3的peer时需要将下一跳修改为本地 上述操作省略仅贴出配置图
4.发布路由
[R1]bgp 100
[R1-bgp]net 172.16.1.0 24
[R1-bgp]net 172.16.2.0 24
[R1-bgp]net 172.16.3.0 24
[R1-bgp]net 172.16.4.0 24
[R5]bgp 200
[R5-bgp]net 172.16.1.0 24
[R5-bgp]net 172.16.2.0 24
[R5-bgp]net 172.16.3.0 24
[R5-bgp]net 172.16.4.0 24 修改AS_Path
创建前缀列表匹配相关流量用路由策略修改172.16.1.0的as-path最后在R1的出口方向调用路由策略实现修改这里我 选择添加as-path400 500值得注意的是路由策略需要写一条空语句以放行其他路由信息 打入refresh bgp all export 刷新下R1bgp路由的出方向在R3路由器上查看相关路由可见其as-path加上了500 和 400 还是R3可以看到其优选R4的路径 修改Local_Preference属性
同上创建路由策略修改指定参数同样的bgp调用将要发送给R3的172.16.2.0的路由local_preference修改为200 同样查看表项来自R4的路由被优选 修改MED属性
修改MED由于其继承上个区域的cost因此只要在边界设备修改cost即可
值得注意的是这里要使用import刷新的时候也是一样同时还需要在R3上开启med比较
使用此条命令打开compare-different-as-med 打开R3查看信息ok的老弟也是选上了R4 修改preferred-value属性
同理在R3上修改preferred-value值在R3的bgp上对来自R4的import方向调用相关策略
刷新路由表查看R3路由信息 可见路由优选R4值也被改为300 相关配置
R1
interface LoopBack0ip address 10.0.1.1 255.255.255.255
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interface LoopBack1ip address 172.16.1.1 255.255.255.0
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interface LoopBack2ip address 172.16.2.1 255.255.255.0
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interface LoopBack3ip address 172.16.3.1 255.255.255.0
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interface LoopBack4ip address 172.16.4.1 255.255.255.0
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bgp 100router-id 10.0.1.1peer 10.0.12.2 as-number 300 #ipv4-family unicastundo synchronizationnetwork 172.16.1.0 255.255.255.0 network 172.16.2.0 255.255.255.0 network 172.16.3.0 255.255.255.0 network 172.16.4.0 255.255.255.0 peer 10.0.12.2 enablepeer 10.0.12.2 route-policy as export
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route-policy as permit node 10 if-match ip-prefix 1 apply as-path 500 400 additive
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route-policy as permit node 20
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ip ip-prefix 1 index 10 permit 172.16.1.0 24 greater-equal 24 less-equal 24R2
interface GigabitEthernet0/0/0ip address 10.0.12.2 255.255.255.0
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interface GigabitEthernet0/0/1ip address 10.0.23.2 255.255.255.0
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interface GigabitEthernet0/0/2
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interface NULL0
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interface LoopBack0ip address 10.0.2.2 255.255.255.255
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bgp 300router-id 10.0.2.2peer 10.0.3.3 as-number 300 peer 10.0.3.3 connect-interface LoopBack0peer 10.0.12.1 as-number 100 #ipv4-family unicastundo synchronizationpeer 10.0.3.3 enablepeer 10.0.3.3 next-hop-local peer 10.0.12.1 enablepeer 10.0.12.1 route-policy med import
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ospf 1 router-id 10.0.2.2 area 0.0.0.0 network 10.0.2.2 0.0.0.0 network 10.0.23.2 0.0.0.0
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route-policy med permit node 10 if-match ip-prefix 1 apply cost 200
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route-policy med permit node 20
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ip ip-prefix 1 index 10 permit 172.16.3.0 24 greater-equal 24 less-equal 24
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R3
interface GigabitEthernet0/0/0ip address 10.0.23.3 255.255.255.0
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interface GigabitEthernet0/0/1ip address 10.0.34.3 255.255.255.0
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interface GigabitEthernet0/0/2
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interface NULL0
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interface LoopBack0ip address 10.0.3.3 255.255.255.255
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bgp 300router-id 10.0.3.3peer 10.0.2.2 as-number 300 peer 10.0.2.2 connect-interface LoopBack0peer 10.0.4.4 as-number 300 peer 10.0.4.4 connect-interface LoopBack0#ipv4-family unicastundo synchronizationcompare-different-as-medpeer 10.0.2.2 enablepeer 10.0.4.4 enablepeer 10.0.4.4 route-policy pv import
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ospf 1 router-id 10.0.3.3 area 0.0.0.0 network 10.0.3.3 0.0.0.0 network 10.0.23.3 0.0.0.0 network 10.0.34.3 0.0.0.0
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route-policy pv permit node 10 if-match ip-prefix 1 apply preferred-value 300
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route-policy pv permit node 20
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ip ip-prefix 1 index 10 permit 172.16.4.0 24 greater-equal 24 less-equal 24
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R4
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interface GigabitEthernet0/0/0ip address 10.0.34.4 255.255.255.0
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interface GigabitEthernet0/0/1ip address 10.0.45.4 255.255.255.0
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interface GigabitEthernet0/0/2
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interface NULL0
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interface LoopBack0ip address 10.0.4.4 255.255.255.255
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bgp 300router-id 10.0.4.4peer 10.0.3.3 as-number 300 peer 10.0.3.3 connect-interface LoopBack0peer 10.0.45.5 as-number 200 #ipv4-family unicastundo synchronizationpeer 10.0.3.3 enablepeer 10.0.3.3 route-policy lp exportpeer 10.0.3.3 next-hop-local peer 10.0.45.5 enable
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ospf 1 router-id 10.0.4.4 area 0.0.0.0 network 10.0.4.4 0.0.0.0 network 10.0.34.4 0.0.0.0
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route-policy lp permit node 10 if-match ip-prefix 1 apply local-preference 200
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route-policy lp permit node 20
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ip ip-prefix 1 index 10 permit 172.16.2.0 24 greater-equal 24 less-equal 24
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R5
interface GigabitEthernet0/0/0ip address 10.0.45.5 255.255.255.0
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interface GigabitEthernet0/0/1
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interface GigabitEthernet0/0/2
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interface NULL0
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interface LoopBack0ip address 10.0.5.5 255.255.255.255
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interface LoopBack1ip address 172.16.1.1 255.255.255.0
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interface LoopBack2ip address 172.16.2.1 255.255.255.0
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interface LoopBack3ip address 172.16.3.1 255.255.255.0
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interface LoopBack4ip address 172.16.4.1 255.255.255.0
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bgp 200router-id 10.0.5.5peer 10.0.45.4 as-number 300 #ipv4-family unicastundo synchronizationnetwork 172.16.1.0 255.255.255.0 network 172.16.2.0 255.255.255.0 network 172.16.3.0 255.255.255.0 network 172.16.4.0 255.255.255.0 peer 10.0.45.4 enable
#
