AToM – Ethernet sobre MPLS com VLAN
Autor: Bruno Barata | Publicado: 2013-04-30T16:51:00-03:00

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O Any Transport over MPLS (AToM) é uma solução usada para
transportar pacotes L2 através de um backbone MPLS. O AToM
permite a conectividade entre os sites dos clientes com suas tecnologias L2
existentes através da infraestrutura de rede baseada em pacote.

Com a tecnologia AToM o aprovisionamento e a
conectividade são diretas. Um cliente usando Ethernet num edifício ou campus em
um local pode se conectar por meio de um provedor via Ethernet sobre MPLS a
clientes em locais remotos.



AToM estabelece um quadro comum para encapsular
e transportar trafegos Layer 2 sobre a rede MPLS. Os provedores podem usar uma
infra-estrutura única MPLS para oferecer aos clientes a conectividade Layer 2.

O AToM suporta os tipos de transporte abaixo:

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ATM AAL5 over MPLS

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ATM Cell Relay over MPLS

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Ethernet VLAN over MPLS

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Frame Relay over MPLS

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
PPP over MPLS

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
HDLC over MPLS

Ethernet over MPLS

O transporte do L2 funciona através do
encapsulamento Ethernet PDUs em pacotes MPLS e encaminha-os através da rede
MPLS. Cada PDU é transportado como um único pacote. As seguintes etapas
descrevem o processo de encapsular o PDU.

Ingress PE Router

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
O PE de entrada recebe o PDU e remove o preamble,
o delimitador do frame (SFD), e o frame check sequence (FCS). O resto do
cabeçalho permanece o mesmo.

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
O PE copia o codigo de controle do cabeçalho,
mesmo que não seja usado, adiciona um label VC e um label do túnel LSP para o
roteamento normal do MPLS através do backbone. A rede roteia os dados usando o
tunnel LSP convencional do MPLS sem distinguir o tipo de tráfego.

Egress PE Router

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
O PE de destino recebe o pacote e remote o label
do LSP, caso exista (Penultimo geralmente retira), retira o label de controle e
o label do VOCÊ;

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
O PE atualiza o cabeçalho se necessário e envia
o pacote para o CE associado.







Objetivo

Cinco
roteadores (CE1, PE1, P, PE2 e CE2) são conectados formando um backbone com 3
roteadores e dois CEs conectados. Pede-se:

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; O
protocolo de roteamento de backbone PE1-P-PE2 deverá ser o OSPF na área 0 com
todas as interfaces divulgadas e com LDP entre os PEs para tráfego MPLS;

•&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; O
CE1 e o CE2 e deverão se comunicar via o backbone usando túnel AToM.

Topologia









IOS
utilizados

• CE1,
PE1, P, PE2 e CE2 – c7200-k91p-mz.122-25.S15.bin

Configuração
dos Roteadores

Configurações do OSPF do Backbone

Em todos os roteadores configura-se o
roteamento OSPF pelo comando “router
ospf ” onde o “processo” é um numero do processo OSPF. O
roteador também possui um router ID único que geralmente é a interface loopback
ou então o maior endereço IP do roteador.

Para adicionar interfaces deve-se usar o
comando “network 


 área 

”. Um roteador pode ter interfaces
em áreas distintas, define-se cada área pelo comando network e o tipo da área
com o comando “area  [type]”.

Configurações do MPLS

Antes de qualquer configuração, o Cisco Express
forwarding deve ser habilitado com o comando “ip cef”. Para habilitar o MPLS no modo LDP, usa-se o comando global
“mpls label protocol ldp”.

Para habilitar o MPLS nas interfaces,
configura-se “mpls ip”.

Configuração do Túnel AToM

O tunnel L2 AToM é configurado na interface do
PE conectada diretamente ao CE com o comando “xconnect   encapsulation mpls”.
O ID do VOCÊ tem que ser o mesmo nos dois PEs.

Para interface em trunk, deve-se configurar o
trunk na interface do PE.

Observações e Bugs

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/atom/ftbookt.pdf





&nbsp; 

Configuração




&nbsp;

CE1 





!

interface
FastEthernet1/0.10

&nbsp;encapsulation dot1Q 10

&nbsp;ip address 10.10.10.1 255.255.255.0

!





&nbsp;

&nbsp;PE1





!

ip cef

!

mpls
label protocol ldp

!

!

interface
Loopback0

&nbsp;ip address 1.1.1.1 255.255.255.255

!

interface FastEthernet1/0.10

&nbsp;encapsulation dot1Q 10

&nbsp;xconnect 2.2.2.2 100
encapsulation mpls

!

interface
FastEthernet2/0

&nbsp;ip address 13.13.13.1 255.255.255.0

&nbsp;mpls ip

!

router
ospf 1

&nbsp;router-id 1.1.1.1

&nbsp;network 1.1.1.1 0.0.0.0 area 0

&nbsp;network 13.13.13.1 0.0.0.0 area 0

!





&nbsp;

P





!

ip cef

!

mpls
label protocol ldp

!

!

interface
Loopback0

&nbsp;ip address 3.3.3.3 255.255.255.255

!

interface
FastEthernet1/0

&nbsp;ip address 13.13.13.3 255.255.255.0

&nbsp;mpls ip

!

interface
FastEthernet2/0

&nbsp;ip address 23.23.23.3 255.255.255.0

&nbsp;mpls ip

!

router
ospf 1

&nbsp;router-id 3.3.3.3

&nbsp;network 3.3.3.3 0.0.0.0 area 0

&nbsp;network 13.13.13.3 0.0.0.0 area 0

&nbsp;network 23.23.23.3 0.0.0.0 area 0

!





&nbsp;

&nbsp;PE2





!

ip cef

!

mpls
label protocol ldp

!

!

interface
Loopback0

&nbsp;ip address 2.2.2.2 255.255.255.255

!

interface FastEthernet1/0.10

&nbsp;encapsulation dot1Q 10

&nbsp;xconnect 1.1.1.1 100
encapsulation mpls

!

interface
FastEthernet2/0

&nbsp;ip address 23.23.23.2 255.255.255.0

&nbsp;mpls ip

!

router
ospf 1

&nbsp;router-id 2.2.2.2

&nbsp;network 2.2.2.2 0.0.0.0 area 0

&nbsp;network 23.23.23.2 0.0.0.0 area 0

!





&nbsp;

CE2








!




interface
FastEthernet1/0.10




&nbsp;encapsulation dot1Q 10




&nbsp;ip address 20.20.20.1 255.255.255.0




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   UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/>
  <w:LsdException Locked="false" Priority="60" SemiHidden="false"
   UnhideWhenUsed="false" Name="Light Shading Accent 6"/>
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   UnhideWhenUsed="false" Name="Light List Accent 6"/>
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   UnhideWhenUsed="false" Name="Light Grid Accent 6"/>
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  <w:LsdException Locked="false" Priority="64" SemiHidden="false"
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   UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/>
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   UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/>
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   UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/>
  <w:LsdException Locked="false" Priority="70" SemiHidden="false"
   UnhideWhenUsed="false" Name="Dark List Accent 6"/>
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   UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/>
  <w:LsdException Locked="false" Priority="72" SemiHidden="false"
   UnhideWhenUsed="false" Name="Colorful List Accent 6"/>
  <w:LsdException Locked="false" Priority="73" SemiHidden="false"
   UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/>
  <w:LsdException Locked="false" Priority="19" SemiHidden="false"
   UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/>
  <w:LsdException Locked="false" Priority="21" SemiHidden="false"
   UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/>
  <w:LsdException Locked="false" Priority="31" SemiHidden="false"
   UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/>
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   UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/>
  <w:LsdException Locked="false" Priority="33" SemiHidden="false"
   UnhideWhenUsed="false" QFormat="true" Name="Book Title"/>
  
  
 
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