Example for Configuring Inter-AS BGP VPWS Option A

This section provides an example for configuring inter-AS LDP VPWS Option A. Inter-AS LDP VPWS Option A can be easily deployed and is recommended for scenarios where few inter-AS PWs are required.

Networking Requirements

On the network shown in Figure 1, CE1 and CE2 access the MPLS backbone network through PE1 in AS100 and PE2 in AS200, respectively.

Inter-AS LDP VPWS Option A needs to be deployed for CE1 and CE2 to communicate.

Figure 1 Configuring inter-AS BGP VPWS Option A

  • Interfaces 1 and 2 in this example represent GE 0/1/0 and GE 0/1/8, respectively.



Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure an IGP for each AS on the MPLS backbone network to ensure IP connectivity within the same AS.

  2. Configure basic MPLS functions on the MPLS backbone network and establish a dynamic LSP between the PE and ASBR in the same AS. If the PE and ASBR are not directly connected, establish a remote LDP session between them.

  3. Configure PEs to exchange VPWS information as BGP peers.

  4. Establish a BGP VPWS connection between the PE and ASBR in the same AS.

Data Preparation

To complete the configuration, you need the following data:

  • IP address of the remote peer

  • Data for configuring the IGP

  • MPLS LSR IDs (local loopback interface IP addresses) of PEs and ASBRs

Procedure

  1. Configure interface IP addresses.

    # Configure CE1.

    <HUAWEI> system-view
[~HUAWEI] sysname CE1
[*HUAWEI] commit
[~CE1] interface gigabitethernet 0/1/0
[*CE1-GigabitEthernet0/1/0] ip address 10.1.1.1 24
[*CE1-GigabitEthernet0/1/0] quit
[*CE1] commit

    # Configure PE1.

    <HUAWEI> system-view
[~HUAWEI] sysname PE1
[*HUAWEI] commit
[~PE1] interface loopback1
[*PE1-Loopback1] ip address 1.1.1.9 32
[*PE1-Loopback1] quit
[*PE1] interface gigabitethernet 0/1/8
[*PE1-GigabitEthernet0/1/8] ip address 10.10.1.1 24
[*PE1-GigabitEthernet0/1/8] quit
[*PE1] commit

    # Configure ASBR1.

    <HUAWEI> system-view
[~HUAWEI] sysname ASBR1
[*HUAWEI] commit
[~ASBR1] interface loopback1
[*ASBR1-Loopback1] ip address 2.2.2.9 32
[*ASBR1-Loopback1] quit
[*ASBR1] interface gigabitethernet 0/1/0
[*ASBR1-GigabitEthernet0/1/0] ip address 10.10.1.2 24
[*ASBR1-GigabitEthernet0/1/0] quit
[*ASBR1] commit

    # Configure ASBR2.

    <HUAWEI> system-view
[~HUAWEI] sysname ASBR2
[*HUAWEI] commit
[~ASBR2] interface loopback1
[*ASBR2-Loopback1] ip address 3.3.3.9 32
[*ASBR2-Loopback1] quit
[*ASBR2] interface gigabitethernet 0/1/8
[*ASBR2-GigabitEthernet0/1/8] ip address 10.20.1.1 24
[*ASBR2-GigabitEthernet0/1/8] quit
[*ASBR2] commit

    # Configure PE2.

    <HUAWEI> system-view
[~HUAWEI] sysname PE2
[*HUAWEI] commit
[~PE2] interface loopback1
[*PE2-Loopback1] ip address 4.4.4.9 32
[*PE2-Loopback1] quit
[*PE2] interface gigabitethernet 0/1/0
[*PE2-GigabitEthernet0/1/0] ip address 10.20.1.2 24
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] commit

    # Configure CE2.

    <HUAWEI> system-view
[~HUAWEI] sysname CE2
[*HUAWEI] commit
[~CE2] interface gigabitethernet 0/1/0
[*CE2-GigabitEthernet0/1/0] ip address 10.1.1.2 24
[*CE2-GigabitEthernet0/1/0] quit
[*CE2] commit

  2. Configure an IGP on the MPLS backbone network.

    # Configure PE1.

    [~PE1] ospf 1
[*PE1-ospf-1] area 0.0.0.0
[*PE1-ospf-1-area-0.0.0.0] network 1.1.1.9 0.0.0.0
[*PE1-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255
[*PE1-ospf-1-area-0.0.0.0] quit
[*PE1-ospf-1] quit
[*PE1] commit

    # Configure ASBR1.

    [~ASBR1] ospf 1
[*ASBR1-ospf-1] area 0.0.0.0
[*ASBR1-ospf-1-area-0.0.0.0] network 2.2.2.9 0.0.0.0
[*ASBR1-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255
[*ASBR1-ospf-1-area-0.0.0.0] quit
[*ASBR1-ospf-1] quit
[*ASBR1] commit

    # Configure ASBR2.

    [~ASBR2] ospf 1
[*ASBR2-ospf-1] area 0.0.0.0
[*ASBR2-ospf-1-area-0.0.0.0] network 3.3.3.9 0.0.0.0
[*ASBR2-ospf-1-area-0.0.0.0] network 10.20.1.0 0.0.0.255
[*ASBR2-ospf-1-area-0.0.0.0] quit
[*ASBR2-ospf-1] quit
[*ASBR2] commit

    # Configure PE2.

    [~PE2] ospf 1
[*PE2-ospf-1] area 0.0.0.0
[*PE2-ospf-1-area-0.0.0.0] network 4.4.4.9 0.0.0.0
[*PE2-ospf-1-area-0.0.0.0] network 10.20.1.0 0.0.0.255
[*PE2-ospf-1-area-0.0.0.0] quit
[*PE2-ospf-1] quit
[*PE2] commit

  3. Configure basic MPLS functions and establish LSPs.

    # Configure PE1.

    [~PE1] mpls lsr-id 1.1.1.9
[*PE1] mpls
[*PE1-mpls] quit
[*PE1] mpls ldp
[*PE1-mpls-ldp] quit
[*PE1] interface gigabitethernet 0/1/8
[*PE1-GigabitEthernet0/1/8] mpls
[*PE1-GigabitEthernet0/1/8] mpls ldp
[*PE1-GigabitEthernet0/1/8] quit
[*PE1] commit

    # Configure ASBR1.

    [~ASBR1] mpls lsr-id 2.2.2.9
[*ASBR1] mpls
[*ASBR1-mpls] quit
[*ASBR1] mpls ldp
[*ASBR1-mpls-ldp] quit
[*ASBR1] interface gigabitethernet 0/1/0
[*ASBR1-GigabitEthernet0/1/0] mpls
[*ASBR1-GigabitEthernet0/1/0] mpls ldp
[*ASBR1-GigabitEthernet0/1/0] quit
[*ASBR1] commit

    # Configure ASBR2.

    [~ASBR2] mpls lsr-id 3.3.3.9
[*ASBR2] mpls
[*ASBR2-mpls] quit
[*ASBR2] mpls ldp
[*ASBR2-mpls-ldp] quit
[*ASBR2] interface gigabitethernet 0/1/8
[*ASBR2-GigabitEthernet0/1/8] mpls
[*ASBR2-GigabitEthernet0/1/8] mpls ldp
[*ASBR2-GigabitEthernet0/1/8] quit
[*ASBR2] commit

    # Configure PE2.

    [~PE2] mpls lsr-id 4.4.4.9
[*PE2] mpls
[*PE2-mpls] quit
[*PE2] mpls ldp
[*PE2-mpls-ldp] quit
[*PE2] interface gigabitethernet 0/1/0
[*PE2-GigabitEthernet0/1/0] mpls
[*PE2-GigabitEthernet0/1/0] mpls ldp
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] commit

  4. Configure PEs to exchange VPWS information as BGP peers.

    # Configure PE1.

    [~PE1] bgp 100
[*PE1-bgp] peer 2.2.2.9 as-number 100
[*PE1-bgp] peer 2.2.2.9 connect-interface loopback 1
[*PE1-bgp] l2vpn-ad-family
[*PE1-bgp-af-l2vpn-ad] peer 2.2.2.9 enable
[*PE1-bgp-af-l2vpn-ad] peer 2.2.2.9 signaling vpws
[*PE1-bgp-af-l2vpn-ad] quit
[*PE1-bgp] quit
[*PE1] commit

    # Configure ASBR1.

    [~ASBR1] bgp 100
[*ASBR1-bgp] peer 1.1.1.9 as-number 100
[*ASBR1-bgp] peer 1.1.1.9 connect-interface loopback 1
[*ASBR1-bgp] l2vpn-ad-family
[*ASBR1-bgp-af-l2vpn-ad] peer 1.1.1.9 enable
[*ASBR1-bgp-af-l2vpn-ad] peer 1.1.1.9 signaling vpws
[*ASBR1-bgp-af-l2vpn-ad] quit
[*ASBR1-bgp] quit
[*ASBR1] commit

    # Configure ASBR2.

    [~ASBR2] bgp 200
[*ASBR2-bgp] peer 4.4.4.9 as-number 200
[*ASBR2-bgp] peer 4.4.4.9 connect-interface loopback 1
[*ASBR2-bgp] l2vpn-ad-family
[*ASBR2-bgp-af-l2vpn-ad] peer 4.4.4.9 enable
[*ASBR2-bgp-af-l2vpn-ad] peer 4.4.4.9 signaling vpws
[*ASBR2-bgp-af-l2vpn-ad] quit
[*ASBR2-bgp] quit
[*ASBR2] commit

    # Configure PE2.

    [~PE2] bgp 200
[*PE2-bgp] peer 3.3.3.9 as-number 200
[*PE2-bgp] peer 3.3.3.9 connect-interface loopback 1
[*PE2-bgp] l2vpn-ad-family
[*PE2-bgp-af-l2vpn-ad] peer 3.3.3.9 enable
[*PE2-bgp-af-l2vpn-ad] peer 3.3.3.9 signaling vpws
[*PE2-bgp-af-l2vpn-ad] quit
[*PE2-bgp] quit
[*PE2] commit

  5. Configure a BGP connection.

    # Configure PE1.

    [~PE1] mpls l2vpn
[*PE1-l2vpn] quit
[*PE1] mpls l2vpn vpn1 encapsulation ethernet
[*PE1-mpls-l2vpn-vpn1] route-distinguisher 100:1
[*PE1-mpls-l2vpn-vpn1] vpn-target 1:1 both
[*PE1-mpls-l2vpn-vpn1] ce ce1 id 1 range 10
[*PE1-mpls-l2vpn-vpn1-ce-ce1] connection ce-offset 2 interface gigabitethernet 0/1/0
[*PE1-mpls-l2vpn-vpn1-ce-ce1] quit
[*PE1-mpls-l2vpn-vpn1] quit
[*PE1] commit

    # Configure ASBR1.

    [~ASBR1] mpls l2vpn
[*ASBR1-l2vpn] quit
[*ASBR1] mpls l2vpn vpn1 encapsulation ethernet
[*ASBR1-mpls-l2vpn-vpn1] route-distinguisher 100:1
[*ASBR1-mpls-l2vpn-vpn1] vpn-target 1:1 both
[*ASBR1-mpls-l2vpn-vpn1] ce ce2 id 2 range 10
[*ASBR1-mpls-l2vpn-vpn1-ce-ce2] connection ce-offset 1 interface gigabitethernet 0/1/8
[*ASBR1-mpls-l2vpn-vpn1-ce-ce2] quit
[*ASBR1-mpls-l2vpn-vpn1] quit
[*ASBR1] commit

    # Configure ASBR2.

    [~ASBR2] mpls l2vpn
[*ASBR2-l2vpn] quit
[*ASBR2] mpls l2vpn vpn1 encapsulation ethernet
[*ASBR2-mpls-l2vpn-vpn1] route-distinguisher 200:1
[*ASBR2-mpls-l2vpn-vpn1] vpn-target 1:1 both
[*ASBR2-mpls-l2vpn-vpn1] ce ce3 id 3 range 10
[*ASBR2-mpls-l2vpn-vpn1-ce-ce3] connection ce-offset 4 interface gigabitethernet 0/1/0
[*ASBR2-mpls-l2vpn-vpn1-ce-ce3] quit
[*ASBR2-mpls-l2vpn-vpn1] quit
[*ASBR2] commit

    # Configure PE2.

    [~PE2] mpls l2vpn
[*PE2-l2vpn] quit
[*PE2] mpls l2vpn vpn1 encapsulation ethernet
[*PE2-mpls-l2vpn-vpn1] route-distinguisher 200:1
[*PE2-mpls-l2vpn-vpn1] vpn-target 1:1 both
[*PE2-mpls-l2vpn-vpn1] ce ce4 id 4 range 10
[*PE2-mpls-l2vpn-vpn1-ce-ce4] connection ce-offset 3 interface gigabitethernet 0/1/8
[*PE2-mpls-l2vpn-vpn1-ce-ce4] quit
[*PE2-mpls-l2vpn-vpn1] quit
[*PE2] commit

  6. Verify the configuration.

    After completing the configuration, run the display mpls l2vpn connection interface gigabitethernet command on each PE. The command output shows that a BGP VC has been established and is in the Up state. The following example uses the command output on PE1.

    [~PE1] display mpls l2vpn connection interface gigabitethernet 0/1/0
conn-type: remote
     local vc state:             up
     remote vc state:            up
     local ce-id:                1
     local ce name:              ce1
     remote ce-id:               2
     intf(state,encap):          GigabitEthernet0/1/0(up,ethernet)
     peer id:                    2.2.2.9
     route-distinguisher:        100:1
     local vc label:             294930
     remote vc label:            294929
     tunnel policy:              default 
     CKey:                       65
     NKey:                       3841982617
     primary or secondary:       primary
     forward entry exist or not: true
     forward entry active or not:true
     manual fault set or not:    not set 
     AC OAM state:               up 
     BFD for PW session index:   -- 
     BFD for PW state:           invalid 
     BFD for LSP state:          true
     Local C bit is not set       
     Remote C bit is not set             
     tunnel type:                ldp
     tunnel id:                  0x0000000001004c6b42

    CE1 and CE2 can ping each other. The following example uses the command output on CE1.

    [~CE1] ping 10.1.1.2
  PING 10.1.1.2: 56  data bytes, press CTRL_C to break
    Reply from 10.1.1.2: bytes=56 Sequence=1 ttl=255 time=430 ms
    Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=255 time=220 ms
    Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=255 time=190 ms
    Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=255 time=190 ms
    Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=255 time=190 ms

  --- 10.1.1.2 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 190/244/430 ms

Configuration Files

  • CE1 configuration file

    #
sysname CE1
#
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 10.1.1.1 255.255.255.0
#               
return

  • CE2 configuration file

    #
sysname CE2
#
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 10.1.1.2 255.255.255.0
#               
return

  • PE1 configuration file

    #
sysname PE1
#
mpls lsr-id 1.1.1.9
#
mpls
#
mpls l2vpn
#
mpls ldp
#               
interface GigabitEthernet0/1/8
 undo shutdown  
 ip address 10.10.1.1 255.255.255.0
 mpls           
 mpls ldp       
#               
interface LoopBack1
 ip address 1.1.1.9 255.255.255.255
#               
mpls l2vpn vpn1 encapsulation ethernet
 route-distinguisher 100:1
 vpn-target 1:1 import-extcommunity
 vpn-target 1:1 export-extcommunity
 ce ce1 id 1 range 10 default-offset 0
  connection ce-offset 2 interface GigabitEthernet0/1/0
#               
bgp 100         
 peer 2.2.2.9 as-number 100
 peer 2.2.2.9 connect-interface LoopBack1
 #              
 ipv4-family unicast
  undo synchronization
  peer 2.2.2.9 enable
 #              
 l2vpn-ad-family
  policy vpn-target
  peer 2.2.2.9 enable
  peer 2.2.2.9 signaling vpws
#               
ospf 1          
 area 0.0.0.0   
  network 1.1.1.9 0.0.0.0
  network 10.10.1.0 0.0.0.255
#               
return

  • ASBR1 configuration file

    #
sysname ASBR1
#
mpls lsr-id 2.2.2.9
#
mpls
#
mpls l2vpn
#
mpls ldp
#               
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 10.10.1.2 255.255.255.0
 mpls           
 mpls ldp       
#               
interface GigabitEthernet0/1/8
 undo shutdown  
#               
interface LoopBack1
 ip address 2.2.2.9 255.255.255.255
#               
mpls l2vpn vpn1 encapsulation ethernet
 route-distinguisher 100:1
 vpn-target 1:1 import-extcommunity
 vpn-target 1:1 export-extcommunity
 ce ce2 id 2 range 10 default-offset 0
  connection ce-offset 1 interface GigabitEthernet0/1/8
#               
bgp 100         
 peer 1.1.1.9 as-number 100
 peer 1.1.1.9 connect-interface LoopBack1
 #              
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.9 enable
 #              
 l2vpn-ad-family
  policy vpn-target
  peer 1.1.1.9 enable
  peer 1.1.1.9 signaling vpws
#               
ospf 1          
 area 0.0.0.0   
  network 2.2.2.9 0.0.0.0
  network 10.10.1.0 0.0.0.255
#               
return

  • ASBR2 configuration file

    #
sysname ASBR2
#
mpls lsr-id 3.3.3.9
#
mpls
#
mpls l2vpn
#
mpls ldp
#
interface GigabitEthernet0/1/0
 undo shutdown  
#               
interface GigabitEthernet0/1/8
 undo shutdown  
 ip address 10.20.1.1 255.255.255.0
 mpls           
 mpls ldp       
#               
interface LoopBack1
 ip address 3.3.3.9 255.255.255.0
#               
mpls l2vpn vpn1 encapsulation ethernet
 route-distinguisher 200:1
 vpn-target 1:1 import-extcommunity
 vpn-target 1:1 export-extcommunity
 ce ce3 id 3 range 10 default-offset 0
  connection ce-offset 4 interface GigabitEthernet0/1/0
#               
bgp 200         
 peer 4.4.4.9 as-number 200
 peer 4.4.4.9 connect-interface LoopBack1
 #              
 ipv4-family unicast
  undo synchronization
  peer 4.4.4.9 enable
 #              
 l2vpn-ad-family
  policy vpn-target
  peer 4.4.4.9 enable
  peer 4.4.4.9 signaling vpws
#               
ospf 1          
 area 0.0.0.0   
  network 3.3.3.9 0.0.0.0
  network 10.20.1.0 0.0.0.255
#               
return

  • PE2 configuration file

    #
sysname PE2
#
mpls lsr-id 4.4.4.9
#
mpls
#
mpls l2vpn
#
mpls ldp
#               
interface GigabitEthernet0/1/0
 undo shutdown  
 ip address 10.20.1.2 255.255.255.0
 mpls           
 mpls ldp       
#               
interface GigabitEthernet0/1/8
 undo shutdown  
#               
interface LoopBack1
 ip address 4.4.4.9 255.255.255.0
#               
mpls l2vpn vpn1 encapsulation ethernet
 route-distinguisher 200:1
 vpn-target 1:1 import-extcommunity
 vpn-target 1:1 export-extcommunity
 ce ce4 id 4 range 10 default-offset 0
  connection ce-offset 3 interface GigabitEthernet0/1/8
#               
bgp 200         
 peer 3.3.3.9 as-number 200
 peer 3.3.3.9 connect-interface LoopBack1
 #              
 ipv4-family unicast
  undo synchronization
  peer 3.3.3.9 enable
 #              
 l2vpn-ad-family
  policy vpn-target
  peer 3.3.3.9 enable
  peer 3.3.3.9 signaling vpws
#               
ospf 1          
 area 0.0.0.0   
  network 4.4.4.9 0.0.0.0
  network 10.20.1.0 0.0.0.255
#               
return
Parent Topic: Configuration Examples for VPWS
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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