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It's similar to CCC but with label stacking ( Tunnel/LSP and VC labels )


1- In the core: 

  • MPLS enable on core interfaces
  • LDP enable on core interfaces:  to create MPLS LSP ( or RSVP for LDP over RSVP )
  • extended LDP session ( targeted-LDP for Alcatel/Nokia )  enable on l0.0 interface
  • single-area OSPF  / Single IGP domain ( BGP or RVSP not needed )

2- PE Router: extended LDP session

  • Neigbor IP@
  • outgoing interface
  • VC-ID ( same both end!!!)

3- PE Router:  VPN service

  • interface and logica interface:   Layer 2 VPN interfaces
  • CCC or TCC encapsulation

3- CE Router



CCC encapsulation:  same vlan at both end

TCC encapsulation: different vlan used by CE



Configuration of l2circuit 

set interfaces ae4 description "to-PE1"
set interfaces ae4 flexible-vlan-tagging
set interfaces ae4 mtu 9192
set interfaces ae4 encapsulation flexible-ethernet-services
set interfaces ae4 aggregated-ether-options lacp active
set interfaces ae4 aggregated-ether-options lacp periodic fast


set interfaces ae4 unit 121 description "ptp to customer1"
set interfaces ae4 unit 121 encapsulation vlan-ccc
set interfaces ae4 unit 121 vlan-id 121
set interfaces ae4 unit 121 input-vlan-map pop
set interfaces ae4 unit 121 output-vlan-map push


set protocols l2circuit neighbor 10.1.1.1 interface ae4.121 virtual-circuit-id 21111
set protocols l2circuit neighbor 10.1.1.1 interface ae4.121 description "l2circuit to customer1"
set protocols l2circuit neighbor 10.1.1.1 interface ae4.121 ignore-mtu-mismatch
set protocols l2circuit neighbor 10.1.1.1 interface ae4.121 pseudowire-status-tlv








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