L2VPN LDP session source IP issue

[jefferyshi]

Hello all,

The L2VPN between PE1 and PE2, both PE need use loopback1(just for L2 VPN) as peering.
PE1----MPLS backbone----PE2

The L2 VPN is working without problem. I expect use loopback1 to establish LDP neighbor, but LDP neigbor established between PE1 loopback0 and PE2 loopback1. Why not is loopback 1 to loopback 1(192.168.1.33(LDP Id) -> 192.168.1.34)? The command "mpls ldp discovery transport-address 192.168.1.34" force to use loopback1 as soruce seem not work under L2 interface?
And suggestion will be appreciated.

sho mpls l2transport vc  detail       
Local interface: Te4/2 up, line protocol up, Ethernet up
  Destination address: 192.168.1.34, VC ID: 30, VC status: up
    Output interface: Te4/1, imposed label stack {449 837}
    Preferred path: not configured 
    Default path: active
    Next hop: 10.10.10.138
  Create time: 00:20:13, last status change time: 00:04:39
  Signaling protocol: LDP, peer 192.168.1.117:0 up
    Targeted Hello: 192.168.1.32(LDP Id) -> 192.168.1.34, LDP is UP--------------->PE1 loopback0---->PE2 lookback1
    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 582, remote 837
    Group ID: local 0, remote 0
    MTU: local 1500, remote 1500
    Remote interface description: L2 MPLS
  Sequencing: receive disabled, send disabled
  Control Word: Off (configured: autosense)
  VC statistics:
    transit packet totals: receive 51, send 105873366
    transit byte totals:   receive 4875, send 91751356572
    transit packet drops:  receive 0, seq error 0, send 0

This is PE1 router configuration:

mpls ldp router-id Loopback0 force
interface Loopback0
ip address 192.168.1.32 255.255.255.255
interface Loopback1
description For L2VPN
ip address 192.168.1.33 255.255.255.255

interface TenGigabitEthernet4/2
mpls ldp discovery transport-address 192.168.1.33
xconnect 192.168.1.34 30 pw-class L2-VPN

PE2 router configuration:

mpls ldp router-id Loopback0 force
interface Loopback0
ip address 192.168.1.117 255.255.255.255
interface Loopback1
description For L2VPN
ip address 192.168.1.34 255.255.255.255

interface TenGigabitEthernet4/1
mpls ldp discovery transport-address 192.168.1.34
xconnect 192.168.1.33 30 pw-class L2-VPN

Thank You

Jeffery

[BALAJI RAJAN]

Hi Jeffery,

Share

sho mpls l2transport vc  detail 

  from PE2 also

Try to do "no mpls ip" and "mpls ip" from global - to restart mpls service. Then share

sho mpls l2transport vc  detail  from both PE1 and PE2

[jefferyshi]

Hello,

Here is PE2 show vc.

I can not restart MPLS servcie, there are lot's of L3 VPN used and used loopback0 as source.

I had restart this l2 VPN many time, but the LDP seesion source not work, always take loopback0.

sho mpls l2transport vc detail

Local interface: Te4/1 up, line protocol up, Ethernet up

  Destination address: 192.168.1.33, VC ID: 30, VC status: up

    Output interface: Te4/2, imposed label stack {352 804}

    Preferred path: not configured 

    Default path: active

    Next hop: 192.168.10.129

  Create time: 00:20:05, last status change time: 00:20:05

  Signaling protocol: LDP, peer 192.168.1.32:0 up

    Targeted Hello: 192.168.1.117(LDP Id) -> 192.168.1.33

--------------->PE2 loopback0---->PE1 lookback1

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

      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

    MPLS VC labels: local 707, remote 804

    Group ID: local 0, remote 0

    MTU: local 1500, remote 1500

    Remote interface description: For L2VPN

  Sequencing: receive disabled, send disabled

  VC statistics:

    packet totals: receive 98815422, send 46

    byte totals:   receive 87440996674, send 4025

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

[jefferyshi]

Hello

My question is why below command not works under layer 2 interface.

PE1:

mpls ldp discovery transport-address 192.168.1.33 (lookback1)

PE2:

mpls ldp discovery transport-address 192.168.1.34 (lookback1)

PE1

sh mpls ldp discovery | b Targeted Hellos:

     Targeted Hellos:

        192.168.1.32 -> 192.168.1.34 (ldp): active, xmit/recv

            LDP Id: 192.168.1.117:0

PE2

sh mpls ldp discovery | b Targeted Hellos:

    Targeted Hellos:

        192.168.1.34 -> 192.168.1.32 (ldp): passive, xmit/recv

            LDP Id: 192.168.1.32:0

        192.168.1.117 -> 192.168.1.33 (ldp): active, xmit   

Thank You

Jeffery