REDES ETHERNET – 21931NA HILSON ANDRADE OSPF (Open Shortest Path First)
Transcript of REDES ETHERNET – 21931NA HILSON ANDRADE OSPF (Open Shortest Path First)
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REDES ETHERNET – 21931NA
HILSON ANDRADE
OSPF (Open Shortest Path First)
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Características
a) Protocolo Link State
b) Usa caminho mais curto para roteamento
c) Utiliza LSA´s
d) Conhecimento da topologia de rede
e) Rápida convergência
f) Otimiza utilização de banda
g) Demanda mais recursos de máquina
h) Utiliza tabelas de vizinhos, topologia e
roteamento
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Tabela de vizinhos (adjacências)
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2 3
Hello
Hello
Hello
Hello
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Tabela de topologia
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2 3
4 65
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Tabela de roteamento
1
2 3
4 65
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Tipos de pacotes OSPF
a) Hello
b) Database Description
c) Link State Request
d) Link State Update (LSA)
e) Link State Ack
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REDES ETHERNET – 21931NA
HILSON ANDRADE
LSA (Link State Advertisement)
a) Transportam informações de topologia
b) Acionado por eventos
c) Ocorrem em “floods”
d) Contêm informações sobre custos*
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Definição do custo OSFP
CUSTO = 100M/BW
Router(config-if)# ip ospf cost n
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REDES ETHERNET – 21931NA
HILSON ANDRADE
OSPF X RIP
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Conceito de áreas OSPF
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Tipos de rede OSPF
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REDES ETHERNET – 21931NA
HILSON ANDRADE
DR e BDR
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Pacote Hello:
a) Utilizam endereço multicast 224.0.0.5
b) Intervalos de 10s em redes Multiacesso
com broadcast e redes ponto-a-ponto.
c) Intervalos de 30s em redes NBMA.
d) Utilizados na eleição do DR e BDR
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Operação do OSPF
LSU
LSU
DR
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2
34
LSAck
LSAck
5
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Operação do OSPFLSU
DR
1
2
34
LSAck
LSAck
LSAck
LSAckLSU
LSU
LSU
5
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REDES ETHERNET – 21931NA
HILSON ANDRADE
Operação do OSPF
DR
1
2
34
5
LSU
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REDES ETHERNET – 21931NA
HILSON ANDRADE
FIM