Cisco IOS L2VPN Port-Mode EoMPLS

In this example, we will configure port-mode EoMPLS (Ethernet over Mpls) between Cisco IOS PE routers.

EoMPLS provides a mpls labeled tunneling mechanism for Ethernet traffic through an MPLS-enabled network.Ingress PE routers encapsulates Ethernet protocol data units  inside MPLS labeled packets and forwards to the remote PE router through the Mpls enabled network.Remote PE router removes the mpls labels and forwards the Ethernet protocol data units to the CE device.

Here is the topology for this example:

Configurations of Routers:

PE-1:
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
 ip ospf 1 area 0
!
!
interface FastEthernet1/0
 ip address 192.168.12.1 255.255.255.0
 ip ospf 1 area 0
 mpls ip
!        
interface FastEthernet1/1
 no ip address
 xconnect 2.2.2.2 100 encapsulation mpls

PE-2:
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 ip ospf 1 area 0
!
!
interface FastEthernet1/0
 ip address 192.168.12.2 255.255.255.0
 ip ospf 1 area 0
 mpls ip
!        
interface FastEthernet1/1
 no ip address
 xconnect 1.1.1.1 100 encapsulation mpls

CE-1
interface FastEthernet1/0
 ip address 12.12.12.1 255.255.255.0
router ospf 12
 log-adjacency-changes
 network 12.12.12.0 0.0.0.255 area 0

CE-2
interface FastEthernet1/0
 ip address 12.12.12.2 255.255.255.0
router ospf 12
 log-adjacency-changes
 network 12.12.12.0 0.0.0.255 area 0

Lets test the EoMPLS configurations:

PE-2#show mpls l2transport vc det
Local interface: Fa1/1 up, line protocol up, Ethernet up
  Destination address: 1.1.1.1, VC ID: 100, VC status: up
    Output interface: Fa1/0, imposed label stack {17}
    Preferred path: not configured 
    Default path: active
    Next hop: 192.168.12.1
  Create time: 00:47:35, last status change time: 00:47:14
  Signaling protocol: LDP, peer 1.1.1.1:0 up
    MPLS VC labels: local 17, remote 17
    Group ID: local 0, remote 0
    MTU: local 1500, remote 1500
    Remote interface description:
  Sequencing: receive disabled, send disabled
  VC statistics:
    packet totals: receive 363, send 638
    byte totals:   receive 36265, send 75764
    packet drops:  receive 0, seq error 0, send 0

Reachability between CE routers:

CE-1#ping 12.12.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.12.12.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 92/109/132 ms
CE Routers learn the mac-addresses of each other:

CE-1#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  12.12.12.1              -   ca02.0fdc.001c  ARPA   FastEthernet1/0
Internet  12.12.12.2             49   ca03.0fdc.001c  ARPA   FastEthernet1/0

CE-2#show interface f1/0 | inc bia
  Hardware is i82543 (Livengood), address is ca03.0fdc.001c (bia ca03.0fdc.001c)

Ospf neighborship between CE routers is established:

CE-1#show ip ospf neighbor
Neighbor ID     Pri   State           Dead Time   Address         Interface
12.12.12.2        1   FULL/DR         00:00:36    12.12.12.2      FastEthernet1/0

We see that port-mode EoMPLS configurations on PE routers are working without any problem.