Layer2 Tunneling protocol version 3 (L2TPv3) has the capability to tunnel any Layer 2 payload over IP networks. L2TPv3 uses IP as transport so it can be used in any IP-aware network including MPLS. L2TPv3 tunnels are point to point.
- Pseudowire = like a wire, but not really, emulates Layer2 over a packet switched network.
- No IP or VRF configuration is required between PE-CE.
Example:
In this example R5 and R6 are provider’s PE routers. R7 and R8 are CE routers connected to R5 and R6. Using psudeowire R7 can connect to R8 just like a regular point-to-point ethernet connection.
R5:
!
pseudowire-class Customer1
encapsulation l2tpv3
ip local interface Loopback0
!
interface Loopback0
ip address 10.10.5.5 255.255.255.255
!
interface Ethernet0/3
no ip address
xconnect 10.10.6.6 1 pw-class Customer1
!
R6:
!
pseudowire-class Customer1
encapsulation l2tpv3
ip local interface Loopback0
!
interface Loopback0
ip address 10.10.6.6 255.255.255.255
!
interface Ethernet0/3
no ip address
xconnect 10.10.5.5 1 pw-class Customer1
!
R7#sh cdp neighbor
Device ID Local Intrfce Holdtme Capability Platform Port ID
R8 Eth 0/0 161 R S I 3640 Eth 0/0
