sexta-feira, 28 de maio de 2010

BGP - Atributo MED 02 (always-compare-med)


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:
         Os roteadores R1, R2 e R3 participam dos AS 1, 2 e 3 respectivamente;
         Os roteadores R4, R5 e R6 possuem como IGP o OSPF na área 0 divulgando suas interfaces físicas;
         O R1 (AS 1) faz conexão EBGP com o R4 (AS 456) e com R2 (AS 2);
         O R3 (AS 3) faz conexão EBGP com o R6 (AS 456) e com R2 (AS 2);
         O roteador R4 deverá ser Router-reflector do seu AS;
         Somente a interface loopback do R2 deverá ser divulgada no BGP;
         O trafego de todos os roteadores do 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.

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

Os roteadores conhecem os endereços IPs de seus vizinhos pelo IGP ou por estarem diretamente conectados, configura-se o BGP em todos os roteadores pelo comando “router bgp ” onde o “AS” é o Autonomous System do provedor. Dentro da configuração de BGP adicionam-se os vizinhos estaticamente com o comando “neighbor remote-as ”, onde se o “as_vizinho” for igual ao AS do roteador a conexão é IBGP, se for diferente será EBGP.
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 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”.
As configurações de BGP atualmente podem ser feitas dentro da família de endereçamento IPv4, ou seja, dentro da configuração de roteamento entra-se no “address-family ipv4” e configuram-se as vizinhanças, router-reflector, community, route-map, etc.
Para que o tráfego com destino a loopback do R2 seja encaminhado pelo link R6xR3 aplicasse no R1 e no R3 route-maps na configuração de vizinhança BGP com o os seus vizinhos externos e também adicionasse o “bgp always-compare-med” nos roteadores do AS 456.
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. No link R1xR4 a métrica configurada no R1 para a rede 2.2.2.2 deve ser maior do que a métrica configurada no R3 no link R3xR6.

2.5           Observações e Bugs

Observe que, caso o MED não fosse alterado na vizinhança dos roteadores R1 e 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:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml

2.6           Comandos Importantes de Verificação

R4#sh ip route

Gateway of last resort is not set

     2.0.0.0/32 is subnetted, 1 subnets
B       2.2.2.2 [200/100] via 36.36.36.3, 00:00:12
     4.0.0.0/32 is subnetted, 1 subnets
C       4.4.4.4 is directly connected, Loopback0
     36.0.0.0/24 is subnetted, 1 subnets
O       36.36.36.0 [110/3] via 45.45.45.5, 00:00:25, FastEthernet0/0
     56.0.0.0/24 is subnetted, 1 subnets
O       56.56.56.0 [110/2] via 45.45.45.5, 00:00:25, FastEthernet0/0
     14.0.0.0/24 is subnetted, 1 subnets
C       14.14.14.0 is directly connected, FastEthernet1/0
     45.0.0.0/24 is subnetted, 1 subnets
C       45.45.45.0 is directly connected, FastEthernet0/0



R6#sh ip route

Gateway of last resort is not set

     2.0.0.0/32 is subnetted, 1 subnets
B       2.2.2.2 [20/100] via 36.36.36.3, 00:02:01
     36.0.0.0/24 is subnetted, 1 subnets
C       36.36.36.0 is directly connected, FastEthernet0/0
     6.0.0.0/32 is subnetted, 1 subnets
C       6.6.6.6 is directly connected, Loopback0
     56.0.0.0/24 is subnetted, 1 subnets
C       56.56.56.0 is directly connected, FastEthernet1/0
     14.0.0.0/24 is subnetted, 1 subnets
O       14.14.14.0 [110/3] via 56.56.56.5, 00:00:56, FastEthernet1/0
     45.0.0.0/24 is subnetted, 1 subnets
O       45.45.45.0 [110/2] via 56.56.56.5, 00:00:56, FastEthernet1/0

2.7           R1

router bgp 1
 bgp router-id 1.1.1.1
 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
!

2.8           R2

!
router bgp 2
 bgp router-id 2.2.2.2
 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
!

2.9           R3

!
router bgp 3
 bgp router-id 3.3.3.3
 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
!

2.10     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 router-id 3.3.3.3
 bgp always-compare-med
 neighbor 14.14.14.1 remote-as 1
 neighbor 45.45.45.5 remote-as 456
!

2.11     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 always-compare-med
 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
!

2.12     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 always-compare-med
 neighbor 36.36.36.3 remote-as 3
 neighbor 56.56.56.5 remote-as 456
!

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