Конфигурация маршрутизатора Cisco: router bgp 5****
no synchronization
bgp log-neighbor-changes
bgp deterministic-med
network 9*.*.*.* mask 255.255.255.0
neighbor 2*.*.*.* remote-as 3216
neighbor 2*.*.*.* description #sov_PEER-2#
neighbor 2*.*.*.* version 4
neighbor 2*.*.*.* send-community
neighbor 2*.*.*.* soft-reconfiguration inbound
neighbor 2*.*.*.* route-map map-AS3216-in in
neighbor 2*.*.*.* route-map map-AS3216-out out
neighbor 3*.*.*.* remote-as 8615
neighbor 3*.*.*.* description #cnt_PEER-1#
neighbor 3*.*.*.* version 4
neighbor 3*.*.*.* send-community
neighbor 3*.*.*.* soft-reconfiguration inbound
neighbor 3*.*.*.* route-map map-AS8615-in in
neighbor 3*.*.*.* route-map map-AS8615-out out
distance bgp 180 200 200
no auto-summary
!
ip forward-protocol nd
!
ip bgp-community new-format
ip as-path access-list 1 permit _6451[2-9]_
ip as-path access-list 1 permit _645[2-9][0-9]_
ip as-path access-list 1 permit _64[6-9][0-9][0-9]_
ip as-path access-list 1 permit _65[0-9][0-9][0-9]_
!
ip prefix-list bogons description #bogus nets#
ip prefix-list bogons seq 15 permit 0.0.0.0/8 le 32
ip prefix-list bogons seq 20 permit 127.0.0.0/8 le 32
ip prefix-list bogons seq 25 permit 192.0.2.0/24 le 32
ip prefix-list bogons seq 30 permit 10.0.0.0/8 le 32
ip prefix-list bogons seq 35 permit 172.16.0.0/12 le 32
ip prefix-list bogons seq 40 permit 192.168.0.0/16 le 32
ip prefix-list bogons seq 45 permit 169.254.0.0/16 le 32
ip prefix-list bogons seq 50 permit 192.42.172.0/24 le 32
ip prefix-list bogons seq 55 permit 198.18.0.0/15 le 32
ip prefix-list bogons seq 60 permit 192.88.99.0/24 le 32
ip prefix-list bogons seq 65 permit 224.0.0.0/4 le 32
ip prefix-list bogons seq 70 permit 240.0.0.0/4 le 32
!
ip prefix-list def_perfix description #deny def_net#
ip prefix-list def_perfix seq 15 permit 0.0.0.0/0 le 32
!
ip prefix-list our_perfix description #our net#
ip prefix-list our_perfix seq 15 permit 9*.*.*.0/24 le 32
route-map map-AS3216-out permit 100
match ip address prefix-list our_perfix
set as-path prepend 5**** 5**** 5****
!
route-map map-AS3216-out deny 110
match ip address prefix-list def_perfix
!
route-map map-AS8615-out permit 100
match ip address prefix-list our_perfix
!
route-map map-AS8615-out deny 110
match ip address prefix-list def_perfix
!
route-map map-AS8615-in deny 100
description #filter private ASs#
match as-path 1
!
route-map map-AS8615-in deny 110
description #filter bogons#
match ip address prefix-list bogons
!
route-map map-AS8615-in permit 200
set local-preference 200
set community 5****:8615
!
route-map map-AS3216-in deny 100
description #filter private ASs#
match as-path 1
!
route-map map-AS3216-in deny 110
description #filter bogons#
match ip address prefix-list bogons
!
route-map map-AS3216-in permit 200
set local-preference 100
set community 5****:3216
1. Договариваемся с провайдерами на анонсирование в вашу AS 0/0
2. Манипулируем количеством повторов своего номера AS в "set as-path prepend 5**** 5**** 5****" для направления входящего трафика.
route-map map-AS3216-out permit 100
match ip address prefix-list our_perfix
set as-path prepend 5**** 5**** 5****
3. Настраиваем маршрут назначения для исходящего трафика через "set local-preference 100", чем больше цифра, тем больше шанс попасть маршруту в таблицу.
route-map map-AS3216-in permit 200
set local-preference 100
set community 5****:3216
4. В итоге определили направления потоков информации, а точнее присутствие в таблице 0/0 от другого провайдера.
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Обсуждается: https://www.opennet.ru/tips/info/2526.shtml
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