Layer 2 VPN in Service Provider

Layer 2 VPN Model

AToM supports the following Layer 2 technologies over MPLS:

• Ethernet

• 802.1Q VLAN

• ATM AAL5 frames

• ATM cells

• Frame Relay

• PPP

• HDLC

Here Some example notes of :

• Implementing AToM for like to like circuits

• Implementing AToM for any to any circuits

• Local switching

 

Implementing AToM for Like to Like Circuits

Configuring AAL5 over MPLS

PE1(config)#interface ATM3/0.100 point-to-point

PE1(config-subif)# pvc 1/100 l2transport

PE1(cfg-if-atm-l2trans-pvc)# encapsulation aal5snap

PE2(config)#interface ATM3/0.100 point-to-point

PE2(config-subif)# pvc 1/100 l2transport

PE2(cfg-if-atm-l2trans-pvc)# encapsulation aal5snap

PE1(cfg-if-atm-l2trans-pvc)#xconnect 10.10.10.102 100 encapsulation mpls

PE2(cfg-if-atm-l2trans-pvc)#xconnect 10.10.10.101 100 encapsulation mpls

Configuring ATM Cell over MPLS

PE1(config)#interface ATM3/0.100 point-to-point

PE1(config-subif)# pvc 1/100 l2transport

PE1(cfg-if-atm-l2trans-pvc)# encapsulation aal0

PE2(config)#interface ATM3/0.100 point-to-point

PE2(config-subif)# pvc 1/100 l2transport

PE2(cfg-if-atm-l2trans-pvc)# encapsulation aal0

PE1(cfg-if-atm-l2trans-pvc)#xconnect 10.10.10.102 100 encapsulation mpls

PE2(cfg-if-atm-l2trans-pvc)#xconnect 10.10.10.101 100 encapsulation mpls

Ethernet over MPLS

Port mode:

PE1(config)#interface FastEthernet5/0

PE1(config-if)#xconnect 10.10.10.102 100 encapsulation mpls

PE2(config)#interface FastEthernet5/0

PE2(config-if)#xconnect 10.10.10.101 100 encapsulation mpls

Vlan Mode:

PE1(config)#interface FastEthernet5/0.100

PE1(config-subif)# encapsulation dot1Q 100

PE1(config-subif)# no cdp enable

PE1(config-subif)# xconnect 10.10.10.102 100 encapsulation mpls

PE2(config)#interface FastEthernet5/0.100

PE2(config-subif)# encapsulation dot1Q 100

PE2(config-subif)# no cdp enable

PE2(config-subif)# xconnect 10.10.10.101 100 encapsulation mpls

Configuring Ethernet over MPLS:

PE1(config)#vlan 100

PE1(config-vlan)#state active

PE1(config-vlan)#exit

PE1(config)#interface fastEthernet 4/1

PE1(config-if)#switchport

PE1(config-if)#switchport access vlan 100

PE1(config-if)#switchport mode access

PE1(config-if)#exit

PE1(config)#interface vlan 100

PE1(config-if)#xconnect 10.10.10.102 100 encapsulation mpls

PE2(config)#vlan 100

PE2(config-vlan)#state active

PE2(config-vlan)#exit

PE2(config)#interface fastEthernet 4/1

PE2(config-if)#switchport

PE2(config-if)#switchport access vlan 100

PE2(config-if)#switchport mode access

PE2(config-if)#exit

PE2(config)#interface vlan 100

PE2(config-if)#xconnect 10.10.10.101 100 encapsulation mpls

Configuring Ethernet over MPLS—dot1q Mode

PE1(config)#vlan 10

PE1(config-vlan)#state active

PE1(config-vlan)#exit

PE1(config)#interface FastEthernet4/12

PE1(config-if)#switchport

PE1(config-if)# switchport access vlan 10

PE1(config-if)# switchport trunk encapsulation dot1q

PE1(config-if)# switchport trunk allowed vlan 100,200

PE1(config-if)# switchport mode dot1q-tunnel

PE1(config-if)#exit

PE1(config)#interface vlan 10

PE1(config-if)#xconnect 10.10.10.102 100 encapsulation mpls

PE2(config)#vlan 10

PE2(config-vlan)#state active

PE2(config-vlan)#exit

PE2(config)#int fastEthernet 4/12

PE2(config-if)#switchport

PE2(config-if)# switchport trunk encapsulation dot1q

PE2(config-if)# switchport trunk allowed vlan 100,200

PE2(config-if)# switchport mode dot1q-tunnel

PE2(config-if)#exit

PE2(config)#interface vlan 10

PE2(config-if)#xconnect 10.10.10.101 100 encapsulation mpls

Configuring PPP over MPLS

PE1(config)# interface Serial2/1

PE1(config-if)#encapsulation ppp

PE1(config-if)# xconnect 10.10.10.102 100 encapsulation mpls

PE2(config)# interface Serial2/1

PE2(config-if)#encapsulation ppp

PE2(config-if)# xconnect 10.10.10.102 100 encapsulation mpls

Configuring Frame Relay over MPLS—DLCI Mode

PE1(config)#frame-relay switching

PE1(config)#interface Serial2/1

PE1(config-if)# encapsulation frame-relay

PE1(config-if)# frame-relay intf-type dce

PE1(config-if)#exit

PE1(config)#connect FR Serial2/1 100 l2transport

PE1(config-fr-pw-switching)# xconnect 10.10.10.102 100 encapsulation mpls

PE2(config)#frame-relay switching

PE2(config)#interface Serial2/1

PE2(config-if)# encapsulation frame-relay

PE2(config-if)# frame-relay intf-type dce

PE2(config-if)#exit

PE2(config)#connect FR Serial2/1 100 l2transport

PE2(config-fr-pw-switching)# xconnect 10.10.10.101 100 encapsulation mpls

L2 VPN—Any to Any Interworking

 

Ethernet to VLAN Interworking

 

PE1(config)#pseudowire-class Eth-VLAN

PE1(config-pw-class)# encapsulation mpls

PE1(config-pw-class)# interworking ethernet

 

PE2(config)#pseudowire-class VLAN-Eth

PE2(config-pw-class)# encapsulation mpls

PE2(config-pw-class)# interworking Ethernet

PE1(config)#interface Ethernet0/0

PE1(config-if)#xconnect 10.10.10.102 100 pw-class Eth-VLAN

PE2(config)#interface Ethernet0/0.10

PE2(config-subif)# encapsulation dot1Q 10

PE2(config-subif)# xconnect 10.10.10.101 100 pw-class VLAN-Eth

Frame Relay to AAL5 Interworking

PE1(config)#pseudowire-class AAL5-FR

PE1(config-pw-class)# encapsulation mpls

PE1(config-pw-class)# interworking ip

PE2(config)#pseudowire-class FR-AAL5

PE2(config-pw-class)# encapsulation mpls

PE2(config-pw-class)# interworking ip

PE1(config-subif)#interface ATM6/0.100 point-to-point

PE1(config-subif)# pvc 1/100 l2transport

PE1(cfg-if-atm-l2trans-pvc)#encapsulation aal5snap

PE1(cfg-if-atm-l2trans-pvc)#xconnect 10.10.10.102 100 pw-class AAL5-FR

PE2(config)#frame-relay switching

PE2(config)#interface POS3/0

PE2(config-if)# no ip address

PE2(config-if)# encapsulation frame-relay

PE2(config-if)# clock source internal

PE2(config-if)# frame-relay intf-type dce

PE2(config-if)#connect FR POS3/0 100 l2transport

PE2(config-fr-pw-switching)#xconnect 10.10.10.101 100 pw-class FR-AAL5

Frame Relay to PPP Interworking

 

PE1(config)#pseudowire-class FR-PPP

PE1(config-pw-class)# encapsulation mpls

PE1(config-pw-class)# interworking ip

PE2(config)#pseudowire-class PPP-FR

PE2(config-pw-class)# encapsulation mpls

PE2(config-pw-class)# interworking ip

PE1(config-if)#interface Serial1/0

PE1(config-if)#no ip address

PE1(config-if)#encapsulation frame-relay

PE1(config-if)#frame-relay intf-type dce

PE1(config-if)#exit

PE1(config)#connect FR Serial1/0 100 l2transport

PE1(config-fr-pw-switching)#xconnect 10.10.10.101 100 pw-class FR-PPP

PE2(config-if)#interface Serial1/0

PE2(config-subif)#encapsulation ppp

PE2(config-subif)#xconnect 10.10.10.102 100 pw-class PPP-FR

Frame Relay to VLAN Interworking

PE1(config)#pseudowire-class FR-VLAN

PE1(config-pw-class)# encapsulation mpls
PE1(config-pw-class)# interworking ip

PE2(config)#pseudowire-class VLAN-FR

PE2(config-pw-class)# encapsulation mpls
PE2(config-pw-class)# interworking ip

PE1(config-pw-class)#interface Serial2/1

PE1(config-if)# no ip address
PE1(config-if)# encapsulation frame-relay
PE1(config-if)# frame-relay intf-type dce
PE1(config-if)#connect FR Serial2/1 100 l2transport
PE1(config-fr-pw-switching)#xconnect 10.10.10.101 100 pw-class FR-VLAN

PE2(config-pw-class)#interface Ethernet0/0.10

PE2(config-subif)# encapsulation dot1Q 10
PE2(config-subif)#xconnect 10.10.10.102 100 pw-class VLAN-FR

AAL5 to VLAN Interworking

 
PE1(config)#pseudowire-class AAL5-VLAN

PE1(config-pw-class)# encapsulation mpls
PE1(config-pw-class)# interworking ip

PE2(config)#pseudowire-class VLAN-AAL5

PE2(config-pw-class)# encapsulation mpls
PE2(config-pw-class)# interworking ip

PE1(config)#interface ATM3/0.100 point-to-point

PE1(config)#mtu 1500
PE1(config-subif)# pvc 1/100 l2transport
PE1(cfg-if-atm-l2trans-pvc)# encapsulation aal5snap
PE1(cfg-if-atm-l2trans-pvc)#xconnect 10.10.10.102 100 pw-class AAL5-VLAN

PE2(config)#interface FastEthernet5/0.100

PE2(config-subif)# encapsulation dot1Q 100
PE2(config-subif)# xconnect 10.10.10.102 100 pw-class VLAN-AAL5

Local Switching

Configuring Frame Relay to Frame Relay Local Switching

PE1(config)#frame-relay switching

PE1(config)#interface Serial2/0
PE1(config-if)# no ip address
PE1(config-if)# encapsulation frame-relay
PE1(config-if)# frame-relay interface-dlci 100 switched
PE1(config-fr-dlci)# frame-relay intf-type dce
PE1(config-fr-dlci)# exit
PE1(config-if)#interface Serial2/2
PE1(config-if)# no ip addressPE1(config-if)# encapsulation frame-relay
PE1(config-if)# frame-relay interface-dlci 101 switched
PE1(config-fr-dlci)# frame-relay intf-type dce
PE1(config-fr-dlci)# exit
PE1(config)#connect FR Serial2/0 100 Serial2/2 101

Local Switching—Ethernet to Ethernet

 
PE1(config)# connect Ethernet fastEthernet 5/0 fastEthernet 1/

Local Switching—ATM to ATM

PE1(config-if)#pvc 1/100 l2transport
PE1(config-if)#exit
PE1(config)#interface atm 4/0
PE1(config-if)# pvc 1/100 l2transport
PE1(config-if)#exit
PE1(config)#connect ATM atm 3/0 1/100 atm 4/0 1/100

Local Switching—Ethernet to Frame Relay

PE1(config)#frame-relay switching

PE1(config-if)#interface Serial2/2
PE1(config-if)# no ip address
PE1(config-if)# encapsulation frame-relay
PE1(config-fr-dlci)# frame-relay intf-type dce
PE1(config-fr-dlci)# exit
PE1(config)# connect ETH-FR fastEthernet 5/0 s2/2 100 interworking ip

Source :MPLS Configuration on Cisco IOS Software