sexta-feira, 28 de maio de 2010

BGP - Atributo MED 04 (Confederation)


1        Atributo MED

O MED, chamado de métrica, é um atributo opcional (optional nontransitive, tipo 4), ou seja, pode não ser avaliado, e não é enviado na informação de rotas para os vizinhos internos, somente para o vizinho do outro AS. É a divulgação de um caminho preferido dentro de um AS para AS’s externos.  Utilizado quando tem 2 entradas para o mesmo AS. Por ser métrica, quanto mais baixo melhor. Se não estiver habilitada a opção de verificar o MED, em routers CISCO é colocado por default o 0 que indica a melhor rota, mas no padrão IETF é colocado como infinito, a pior rota. Pode-se configurar para manter o padrão do IETF: bgp bestpath missing-as-worst
O MED pode ser alterado usando route-maps aplicando para determinadas rotas.
O MED é usado como critério de avaliação de roteamento caso o weight, local preference, as-path e a origem sejam iguais para um mesmo destino.


2        Cenário

2.1           Objetivo

Seis roteadores (R1, R2, R3, R4, R5 e R6) são conectados fisicamente R1-R2-R3-R4-R5-R6-R1 e devem ser configurados com roteamento BGP seguindo os criterios abaixo:
         Todos os roteadores pertencem ao AS 1000 e usam o OSPF na área 0 divulgando suas interfaces físicas;
         Os roteadores R1, R2 e R3 participam dos sub-AS de confederação 1, 2 e 3 respectivamente;
         O R1 (AS 1) faz conexão eBGP com o R4 (sub-AS 456) e com R2 (sub-AS 2);
         O R3 (AS 3) faz conexão eBGP com o R6 (sub-AS 456) e com R2 (sub-AS 2);
         O roteador R4 deverá ser Router-reflector do seu sub-AS;
         Somente a interface loopback do R2 deverá ser divulgada no BGP;
         O trafego de todos os roteadores do sub-AS 456 destinado ao 2.2.2.2 deve ser encaminhado pelo link R6xR3. Essa influencia deve ser feita com uso de MED e route-maps no R1 e R3, lembrando que deverá ser usado confederation.
         Os roteadores R4 e R6 devem se anunciar como o next-hop de saída para o AS 456.

2.2           Topologia

Figure-01:              Topologia

2.3           IOS utilizados

         R1, R2, R3, R4, R5 e R6 – c7200-js-mz.123-7.T.bin

2.4           Configuração dos Roteadores

Em todos os roteadores, antes de configurar o roteamento BGP, deve-se configurar o IGP, ou seja, o roteamento interno para que os roteadores possam conhecer o endereço IP para fechar a conexão BGP e também para que a rota seja divulgada na tabela de roteamento BGP. Esse IGP pode ser OSPF, ISIS, estático, etc.

2.4.1      Configurações do OSPF

Para o OSPF a configuração é feita pelo comando “router ospf ” onde o “processo” é um numero do processo OSPF. Para adicionar interfaces usa-se o comando “network
area ”. Para o roteador fazer vizinhança OSPF é necessário que a rede da interface esteja no comando “network” e a interface não esteja configurada como “passive-interface”.
As interfaces de borda dos roteadores de borda são configuradas como “passive-interface” dentro das configurações de roteamento.

2.4.2      Configurações do BGP

Quando usa-se Confederation a configuração é diferente do BGP convencional. No comando de configuração do roteamento usa-se “router bgp ” onde o “sub-AS” é o Autonomous System da confederação, ou seja, do AS interno ao AS. O AS externo é configurado dentro do roteamento com o comando “bgp confederation identifier ” e os sub-AS que o roteador fará vizinhança devem ser informados com o comando “bgp confederation peers ...”. Dentro da configuração de BGP adicionam-se os vizinhos estaticamente com o comando “neighbor remote-as ”, onde se o “sub-as_vizinho” for igual ao AS do roteador a conexão é IBGP, se for diferente e estiver incluso na lista de peers pelo comando “bgp confederation peers” será EBGP da confederação, caso seja um AS diferente a conexão será EBGP externa.
Adiciona-se o IP da interface loopback como Router-ID pelo comando “router-id ”. Para divulgar rede no BGP é necessário que a rede exista na tabela de roteamento interna e adicionar o comando “network mask ” ou redistribuindo rotas para o BGP com o comando “redistribute”.
Os roteadores dentro do mesmo sub-AS não divulgarão as rotas IBGP entre eles, pois o BGP só divulga para o vizinho rotas aprendidas por EBGP, ou seja, rotas externas. Para isso configura-se os roteadores centrais como Router-reflectors adicionando os demais roteadores como clientes pelo comando “neighbor router-reflector-client”.
Para que o tráfego com destino a loopback do R2 seja encaminhado pelo link R6xR3 aplicasse no R3 um route-map na configuração de vizinhança BGP com o os seus vizinhos externos.
Na configuração de route-map cria-se antes uma ACL com o endereço ip 2.2.2.2. Na configuração do route-map usa-se o “mach ip address ” para identificar as rotas da rede, no caso 2.2.2.2 e depois usa-se “set metric ” para aplicar o valor do MED para aquele endereço.
Para que seja avaliado o MED na confederation usa-se o comando “bgp bestpath med confed” dentro das configurações de roteamento.

2.5           Observações e Bugs

Observe que, caso não fosse adicionado o comando “bgp bestpath med missing-as-worst” nos roteadores do AS 456 e adicionado o MED no R3 o AS 456 iria encaminhar o seu tráfego para os vizinhos baseado na origem (eBGP). Já o roteador central, R5, iria encaminhar seu tráfego usando como critério de seleção de caminho o menor endereço IP do nexthop da rota, ou seja, 14.14.14.1.
Documentação:

2.6           Comandos Importantes de Verificação











3        Configuração

3.1           R1

router ospf 1
 network 12.12.12.1 0.0.0.0 area 0
 network 14.14.14.1 0.0.0.0 area 0
!
router bgp 1
 bgp confederation identifier 1000
 bgp confederation peers 2 456
 neighbor 12.12.12.2 remote-as 2
 neighbor 14.14.14.4 remote-as 456
 neighbor 14.14.14.4 route-map SET-MED out
!
!        
!
route-map SET-MED permit 10
 set metric 200
!

3.2           R2

!
router ospf 1
 network 12.12.12.2 0.0.0.0 area 0
 network 23.23.23.2 0.0.0.0 area 0
!
router bgp 2
 bgp confederation identifier 1000
 bgp confederation peers 1 3
 network 2.2.2.2 mask 255.255.255.255
 neighbor 12.12.12.1 remote-as 1
 neighbor 23.23.23.3 remote-as 3
!

3.3           R3

!
router ospf 1
 network 23.23.23.3 0.0.0.0 area 0
 network 36.36.36.3 0.0.0.0 area 0
!
router bgp 3
 bgp confederation identifier 1000
 bgp confederation peers 2 456
 neighbor 23.23.23.2 remote-as 2
 neighbor 36.36.36.6 remote-as 456
 neighbor 36.36.36.6 route-map SET-MED out
!        
!
route-map SET-MED permit 10
 set metric 100
!

3.4           R4

!
router ospf 1
 network 14.14.14.4 0.0.0.0 area 0
 network 45.45.45.4 0.0.0.0 area 0
!
router bgp 456
 bgp confederation identifier 1000
 bgp confederation peers 1
 bgp bestpath med confed
 neighbor 14.14.14.1 remote-as 1
 neighbor 45.45.45.5 remote-as 456
 neighbor 45.45.45.5 next-hop-self
!

3.5           R5

!
router ospf 1
 network 45.45.45.5 0.0.0.0 area 0
 network 56.56.56.5 0.0.0.0 area 0
!
router bgp 456
 bgp confederation identifier 1000
 bgp bestpath med confed
 neighbor 45.45.45.4 remote-as 456
 neighbor 45.45.45.4 route-reflector-client
 neighbor 56.56.56.6 remote-as 456
 neighbor 56.56.56.6 route-reflector-client
!

3.6           R6

!
router ospf 1
 network 36.36.36.6 0.0.0.0 area 0
 network 56.56.56.6 0.0.0.0 area 0
!
router bgp 456
 bgp confederation identifier 1000
 bgp confederation peers 3
 bgp bestpath med confed
 neighbor 36.36.36.3 remote-as 3
 neighbor 56.56.56.5 remote-as 456
 neighbor 56.56.56.5 next-hop-self
!

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