BGP路由惩罚

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进击的闪电 2018-04-03 14:09:32 ©著作权

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配置 R1#show run | s route router eigrp 90 network 0.0.0.0 router bgp 1 bgp router-id 1.1.1.1 bgp log-neighbor-changes network 1.1.1.1 mask 255.255.255.255 neighbor 2.2.2.2 remote-as 1 neighbor 2.2.2.2 update-source Loopback0 neighbor 2.2.2.2 next-hop-self R2#show run | s route router eigrp 90 network 2.0.0.0 network 12.0.0.0 router bgp 1 bgp router-id 2.2.2.2 bgp log-neighbor-changes neighbor 1.1.1.1 remote-as 1 neighbor 1.1.1.1 update-source Loopback0 neighbor 1.1.1.1 next-hop-self neighbor 3.3.3.3 remote-as 2 neighbor 3.3.3.3 ebgp-multihop 255 neighbor 3.3.3.3 update-source Loopback0 ip route 3.3.3.3 255.255.255.255 23.1.1.3 R3#show run | s bgp router bgp 2 bgp router-id 3.3.3.3 bgp log-neighbor-changes bgp dampening neighbor 2.2.2.2 remote-as 1 neighbor 2.2.2.2 ebgp-multihop 255 neighbor 2.2.2.2 update-source Loopback0 R3#show run | s ip route ip route 2.2.2.2 255.255.255.255 23.1.1.2 结果 (1)关闭开启R1 lo0 R3#show ip bgp BGP table version is 6, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found

 Network          Next Hop            Metric LocPrf Weight Path

*> 1.1.1.1/32 2.2.2.2 0 1 i R3#show ip bgp BGP table version is 5, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found

 Network          Next Hop            Metric LocPrf Weight Path

 Network          Next Hop            Metric LocPrf Weight Path

*> 1.1.1.1/32 2.2.2.2 0 1 i (2)关闭开启R1 lo0 R3#show ip bgp BGP table version is 6, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found

 Network          Next Hop            Metric LocPrf Weight Path

 Network          Next Hop            Metric LocPrf Weight Path

 Network          Next Hop            Metric LocPrf Weight Path

*> 1.1.1.1/32 2.2.2.2
(3)关闭开启R1 lo0 R3#show ip bgp BGP table version is 6, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found

 Network          Next Hop            Metric LocPrf Weight Path

 Network          Next Hop            Metric LocPrf Weight Path

h 1.1.1.1/32 2.2.2.2 0 1 i R3#show ip bgp BGP table version is 6, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found R3#show ip bgp BGP table version is 15, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found

 Network          Next Hop            Metric LocPrf Weight Path

*d 1.1.1.1/32 2.2.2.2 0 1 i 清除惩罚 R3#clear ip bgp dampening R3#show ip bgp
BGP table version is 16, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found

 Network          Next Hop            Metric LocPrf Weight Path

> 1.1.1.1/32 2.2.2.2 0 1 i 最大惩罚值=重用门限2^（最大惩罚时间min/半衰期min） Bgp dampening 15 750 2000 60 15代表半衰期为15min，每15min减半。 750代表重用门限为750，当受到惩罚的路由降低到750以下，路由才可以重新加到表中。 2000代表惩罚门限为2000，当超过2000，该路由就开始受到抑制。 60代表最大惩罚时间为60min。以上均为默认值。代入公式可以得到最大惩罚志为12000=750*2^(60/15)