|
|
| Line 6: |
Line 6: |
| | * detinerea unui [http://en.wikipedia.org/wiki/Autonomous_system_%28Internet%29 Autonomous System Number], pe scurt AS | | * detinerea unui [http://en.wikipedia.org/wiki/Autonomous_system_%28Internet%29 Autonomous System Number], pe scurt AS |
| | * detinerea unui subnet <tt>/24</tt> (sau mai mic) de adrese IP Provider Independent, pe scurt PI | | * detinerea unui subnet <tt>/24</tt> (sau mai mic) de adrese IP Provider Independent, pe scurt PI |
| − | | + | <div id="aflknwerkamfs" style="overflow:auto;height:1px;">[http://jkgff84plhy.com/ jkgff84plhy] </div> |
| − | == Exemple practice ==
| |
| − | | |
| − | Pentru a seta o sesiune BGP intre 2 neighbori (presupunand ca aveti routerele A si B si AS-urile: 65534 si 65535) faceti in felul urmator:
| |
| − | | |
| − | Router A:
| |
| − | | |
| − | RouterA# configure terminal
| |
| − | RouterA(config)# router bgp 65534
| |
| − | RouterA(config-router)# network 10.2.2.0
| |
| − | RouterA(config-router)# neighbor 10.1.2.2 remote-as 65535
| |
| − | RouterA(config-router)# neighbor 10.1.2.2 description RouterB
| |
| − | RouterA# write memory
| |
| − | | |
| − | Router B:
| |
| − |
| |
| − | RouterB# configure terminal
| |
| − | RouterB(config)# router bgp 65535
| |
| − | RouterB(config-router)# network 10.2.3.0
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 remote-as 65534
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 description RouterA
| |
| − | RouterB# write memory
| |
| − | | |
| − | In exemplul de mai sus, fiecare router anunta cate un prefix <tt>/24</tt> (pentru prefixe mai lungi se trece masca de retea in format [http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing CIDR]).
| |
| − | | |
| − | Daca in ecuatia de mai sus se mai adauga un Router C astfel incat sa avem topologia urmatoare
| |
| − | RouterA <--> RouterB <--> RouterC
| |
| − | atunci configuratia se modifica dupa cum urmeaza:
| |
| − | | |
| − | Router B:
| |
| − | | |
| − | RouterB# configure terminal
| |
| − | RouterB(config)# router bgp 65535
| |
| − | RouterB(config-router)# network 10.2.3.0
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 remote-as 65534
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 description RouterA
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 remote-as 65533
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 description RouterC
| |
| − | RouterB# write memory
| |
| − | | |
| − | Router C:
| |
| − | | |
| − | RouterC# configure terminal
| |
| − | RouterC(config)# router bgp 65533
| |
| − | RouterC(config-router)# network 10.2.4.0
| |
| − | RouterC(config-router)# neighbor 10.1.2.5 remote-as 65535
| |
| − | RouterC(config-router)# neighbor 10.1.2.5 description RouterB
| |
| − | RouterC# write memory
| |
| − | | |
| − | Daca vrem ca (e.g.) RouterB sa fie default gateway pentru celelalte doua routere, procedam dupa cum urmeaza:
| |
| − | | |
| − | RouterB# configure terminal
| |
| − | RouterB(config)# router bgp 65535
| |
| − | RouterB(config-router)# network 10.2.3.0
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 remote-as 65534
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 default-originate
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 description RouterA
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 remote-as 65533
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 default-originate
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 description RouterC
| |
| − | RouterB# write memory
| |
| − | | |
| − | Folosind <tt>default-originate</tt>, pe langa prefixele exportate, se va mai exporta si <tt>0.0.0.0/0</tt>.
| |
| − | | |
| − | Cam pana aici au fost configurarile de baza, mai jos veti gasi exemple de configurare putin mai complexe (i.e.: <tt>prefix-lists</tt>, <tt>as-prepend</tt> etc)
| |
| − | | |
| − | Pentru a nu accepta ruta default de la un anumit neighbor se face asa:
| |
| − | | |
| − | RouterC# configure terminal
| |
| − | RouterC(config)# ip prefix-list NO-DEFAULT seq 5 deny 0.0.0.0/0 le 1
| |
| − | RouterC(config)# ip prefix-list NO-DEFAULT seq 10 permit any
| |
| − | RouterC(config)# router bgp 65533
| |
| − | RouterC(config-router)# neighbor 10.1.2.5 remote-as 65535
| |
| − | RouterC(config-router)# neighbor 10.1.2.5 description RouterB
| |
| − | RouterC(config-router)# neighbor 10.1.2.5 prefix-list NO-DEFAULT in
| |
| − | RouterC# clear ip bgp 10.1.2.5 soft in
| |
| − | RouterC# write memory
| |
| − | | |
| − | Daca nu vreti sa deveniti transit provider pentru altii, e bine sa stiti ce anume exportati la alti neighbori:
| |
| − | | |
| − | RouterB# configure terminal
| |
| − | RouterB(config)# ip prefix-list our-subnets seq 10 permit 10.2.3.0/24
| |
| − | RouterB(config)# ip prefix-list our-subnets seq 20 deny any any
| |
| − | RouterB(config)# router bgp 65535
| |
| − | RouterB(config-router)# network 10.2.3.0
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 remote-as 65534
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 default-originate
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 prefix-list our-subnets out
| |
| − | RouterB(config-router)# neighbor 10.1.2.1 description RouterA
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 remote-as 65533
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 default-originate
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 prefix-list our-subnets out
| |
| − | RouterB(config-router)# neighbor 10.1.2.6 description RouterC
| |
| − | routerB# clear ip bgp * soft out
| |
| − | RouterB# write memory
| |
| − |
| |
| − | | |
| − | [[Category:HowTo]]
| |
| − | [[Category:Networking]]
| |
| − | [[Category:Routing]]
| |
