EoMPLS Carrying One VLAN

EoMPLS Carrying One VLAN

Network topology:

Here, an 802.1Q trunk is established between CE and PE. Each VLAN is mapped to one Pseudowire.

Configuration:

CE Configuration

CE1 router:

interface Fastethernet 0/0

 no ip address

interface Fastethernet 0/0.100

 encapsulation dot1q 100

 ip address 10.100.1.1 255.255.255.252

interface Fastethernet 0/0.200

 encapsulation dot1q 200

 ip address 10.200.1.1 255.255.255.252

CE2 router:

interface Fastethernet 0/0

 no ip address

interface Fastethernet 0/0.100

 encapsulation dot1q 100

 ip address 10.100.1.2 255.255.255.252

interface Fastethernet 0/0.200

 encapsulation dot1q 200

 ip address 10.200.1.2 255.255.255.252

A unique Pseudowire is configured for each VLAN.

PE Configuration

PE1 router:

interface Loopback 0

 ip address 1.1.1.1 255.255.255.255

 ip ospf 1 area 0

interface Fastethernet 0/0

 no ip address

interface Fastethernet 0/0.100

 encapsulation dot1q 100

 no ip address

 xconnect 3.3.3.3 1000 encapsulation mpls

interface Fastethernet 0/0.200

 encapsulation dot1q 200

 no ip address

 xconnect 3.3.3.3 2000 encapsulation mpls

PE2 router:

interface Loopback 0

 ip address 3.3.3.3 255.255.255.255

 ip ospf 1 area 0

interface Fastethernet 1/0

 no ip address

interface Fastethernet 1/0.100

 encapsulation dot1q 100

 no ip address

 xconnect 1.1.1.1 1000 encapsulation mpls

interface Fastethernet 1/0.200

 encapsulation dot1q 200

 no ip address

 xconnect 1.1.1.1 2000 encapsulation mpls

VC Status verification:

The debug mpls l2transport signaling message command shows Label Mapping messages exchanged for each Pseudowire between PE1 and PE2 routers. The VC Type is 4 which indicates Ethernet VLAN mode. VC IDs should match on each side for successful VC establishment.

Label Mapping messages

04:46:37.811: %LDP-5-NBRCHG: LDP Neighbor 3.3.3.3:0 (2) is UP

04:46:37.867: AToM LDP [3.3.3.3]: Sending label mapping msg

04:46:37.875: AToM LDP [3.3.3.3]: Sending label mapping msg vc type 4, cbit 1, vc id 1000, group id 0, vc label 18, status 0x7/LDP 0x1/ADJ 0x0, mtu 1500, peer vlan id 0   , vc handle 0x5A000002

04:46:37.883: AToM LDP [3.3.3.3]: Sending label mapping msg

04:46:37.887: AToM LDP [3.3.3.3]: Sending label mapping msg vc type 4, cbit 1, vc id 2000, group id 0, vc label 19, status 0x7/LDP 0x1/ADJ 0x0, mtu 1500, peer vlan id 0   , vc handle 0xB4000003

04:46:37.975: AToM LDP [3.3.3.3]: Received label mapping msg, id 64, GR instance 2

04:46:37.983: AToM LDP [3.3.3.3]: Received label mapping msg, id 64, GR instance 2 vc type 4, cbit 1, vc id 2000, group id 0, vc label 16, status 0x7/LDP 0x1/ADJ 0x0, mtu 1500, peer vlan id 0   , vc handle 0xB4000003

04:46:37.995: AToM LDP [3.3.3.3]: Received label mapping msg, id 65, GR instance 2

04:46:37.999: AToM LDP [3.3.3.3]: Received label mapping msg, id 65, GR instance 2 vc type 4, cbit 1, vc id 1000, group id 0, vc label 17, status 0x7/LDP 0x1/ADJ 0x0, mtu 1500, peer vlan id 0   , vc handle 0x5A000002

The following output shows successful Pseudowire setup.

Pseudowires

PE1# show mpls l2transport vc

Local intf     Local circuit              Dest address    VC ID      Status

-------------  -------------------------- --------------- ---------- ----------

Fa0/0.100      Eth VLAN 100               3.3.3.3         1000       UP

Fa0/0.200      Eth VLAN 200               3.3.3.3         2000       UP

PE1# show mpls l2transport vc detail

Local interface: Fa0/0.100 up, line protocol up, Eth VLAN 100 up

  Destination address: 3.3.3.3, VC ID: 1000, VC status: up

    Output interface: Fa1/0, imposed label stack {17 17}

    Preferred path: not configured

    Default path: active

    Next hop: 10.1.1.2

  Create time: 00:13:11, last status change time: 00:03:17

  Signaling protocol: LDP, peer 3.3.3.3:0 up

    Targeted Hello: 1.1.1.1(LDP Id) -> 3.3.3.3, LDP is UP

    Status TLV support (local/remote)   : enabled/supported

      LDP route watch                   : enabled

      Label/status state machine        : established, LruRru

      Last local dataplane   status rcvd: No fault

      Last local SSS circuit status rcvd: No fault

      Last local SSS circuit status sent: No fault

      Last local  LDP TLV    status sent: No fault

      Last remote LDP TLV    status rcvd: No fault

      Last remote LDP ADJ    status rcvd: No fault

    MPLS VC labels: local 18, remote 17

    Group ID: local 0, remote 0

    MTU: local 1500, remote 1500

    Remote interface description:

  Sequencing: receive disabled, send disabled

  Control Word: On (configured: autosense)

  VC statistics:

    transit packet totals: receive 0, send 0

    transit byte totals:   receive 0, send 0

    transit packet drops:  receive 0, seq error 0, send 0

Local interface: Fa0/0.200 up, line protocol up, Eth VLAN 200 up

  Destination address: 3.3.3.3, VC ID: 2000, VC status: up

    Output interface: Fa1/0, imposed label stack {17 16}

    Preferred path: not configured

    Default path: active

    Next hop: 10.1.1.2

  Create time: 00:12:48, last status change time: 00:03:17

  Signaling protocol: LDP, peer 3.3.3.3:0 up

    Targeted Hello: 1.1.1.1(LDP Id) -> 3.3.3.3, LDP is UP

    Status TLV support (local/remote)   : enabled/supported

      LDP route watch                   : enabled

      Label/status state machine        : established, LruRru

      Last local dataplane   status rcvd: No fault

      Last local SSS circuit status rcvd: No fault

      Last local SSS circuit status sent: No fault

      Last local  LDP TLV    status sent: No fault

      Last remote LDP TLV    status rcvd: No fault

      Last remote LDP ADJ    status rcvd: No fault

    MPLS VC labels: local 19, remote 16

    Group ID: local 0, remote 0

    MTU: local 1500, remote 1500

    Remote interface description:

  Sequencing: receive disabled, send disabled

  Control Word: On (configured: autosense)

  VC statistics:

    transit packet totals: receive 0, send 0

    transit byte totals:   receive 0, send 0

    transit packet drops:  receive 0, seq error 0, send 0

The following output shows the MPLS LFIB table on PE1 router. It indicates two point-to-point L2 circuits i.e. Pseudowires.

LFIB on PE1

PE1# show mpls forwarding-table

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop

Label      Label      or Tunnel Id     Switched      interface

16         Pop Label  2.2.2.2/32       0             Fa1/0      10.1.1.2

17         Pop Label  10.1.1.4/30      0             Fa1/0      10.1.1.2

18         No Label   l2ckt(1000)      0             Fa0/0.100  point2point

19         No Label   l2ckt(2000)      0             Fa0/0.200  point2point

20         17         3.3.3.3/32       0             Fa1/0      10.1.1.2

VLAN ID Rewrite:

VLAN ID Rewrite is a feature (enabled by default, and cannot be disabled) where if the Ethernet 802.1Q VLAN ID is different at both sides of the AToM network, then the 802.1Q tag might be rewritten. Here, one 802.1Q trunk between PE2 and CE2 routers is changed to VLAN 1000.

VLAN 1000

PE2 router:

interface Fastethernet 1/0.100

 encapsulation dot1q 1000

 xconnect 1.1.1.1 1000 encapsulation mpls

CE2 router:

interface Fastethernet 0/0.100

 encapsulation dot1q 1000

 ip address 10.100.1.2 255.255.255.252

Although the VLAN IDs do not match, the VC is still UP.

VC Status

PE1# show mpls l2transport vc

Local intf     Local circuit              Dest address    VC ID      Status

-------------  -------------------------- --------------- ---------- ----------

Fa0/0.100      Eth VLAN 100               3.3.3.3         1000       UP

Fa0/0.200      Eth VLAN 200               3.3.3.3         2000       UP

PE2# show mpls l2transport vc

Local intf     Local circuit              Dest address    VC ID      Status

-------------  -------------------------- --------------- ---------- ----------

Fa1/0.100      Eth VLAN 1000              1.1.1.1         1000       UP

Fa1/0.200      Eth VLAN 200               1.1.1.1         2000       UP

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