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AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010 CLI-based Configuration Guide - VPN

This document describes VPN features on the device and provides configuration procedures and configuration examples.

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Example for Configuring BGP/MPLS IP VPNs with Overlapping Address Spaces

Example for Configuring BGP/MPLS IP VPNs with Overlapping Address Spaces

Networking Requirements

As shown in Figure 7-43:
  • CE1 connects to the headquarters R&D area of a company, and CE2 connects to the branch R&D area. CE1 and CE2 belong to vpna.
  • CE3 connects to the headquarters non-R&D area, and CE4 connects to the branch non-R&D area. CE3 and CE4 belong to vpnb.
  • TheR&D areas and non-R&D areas use overlapping address spaces.

The company wants to ensure secure communication between the headquarters and branches and isolate the R&D areas from non-R&D areas, without changing the current network deployment.

Figure 7-43  Networking diagram for configuring BGP/MPLS IP VPNs with overlapping address spaces

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure OSPF between the P and PEs to ensure IP connectivity on the backbone network.
  2. Configure basic MPLS capabilities and MPLS LDP on the P and PEs to set up MPLS LSP tunnels for VPN data transmission on the backbone network.
  3. Configure MP-IBGP on PE1 and PE2 to enable them to exchange VPN routing information.
  4. Configure VPN instances vpna and vpnb on PE1 and PE2. Set the VPN target of vpna to 100:100 and the VPN target of vpnb to 200:200. This configuration allows users in the same VPN to communicate with each other and isolates users in different VPNs. Bind the VPN instance to the PE interfaces connected to CEs to provide access for VPN users.
  5. Configure static routes on the CEs and PEs to exchange VPN routing information.

Procedure

  1. Assign IP addresses to interfaces according to Figure 7-43.

    # Configure PE1. The configuration on PE2, P, and CE1 to CE4 is similar to the configuration on PE1 and is not mentioned here.

    <Huawei> system-view
[Huawei] sysname PE1
[PE1] interface loopback 0
[PE1-LoopBack0] ip address 1.1.1.9 32
[PE1-LoopBack0] quit
[PE1] interface gigabitethernet 1/0/0
[PE1-GigabitEthernet1/0/0] ip address 12.1.1.1 24
[PE1-GigabitEthernet1/0/0] quit

  2. Configure OSPF on the MPLS backbone network so that the PEs and Ps can communicate with each other.

    # Configure PE1.

    [PE1] ospf
[PE1-ospf-1] area 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 12.1.1.0 0.0.0.255
[PE1-ospf-1-area-0.0.0.0] quit
[PE1-ospf-1] quit

    # Configure P.

    [P] ospf
[P-ospf-1] area 0
[P-ospf-1-area-0.0.0.0] network 2.2.2.9 0.0.0.0
[P-ospf-1-area-0.0.0.0] network 12.1.1.0 0.0.0.255
[P-ospf-1-area-0.0.0.0] network 23.1.1.0 0.0.0.255
[P-ospf-1-area-0.0.0.0] quit
[P-ospf-1] quit

    # Configure PE2.

    [PE2] ospf
[PE2-ospf-1] area 0
[PE2-ospf-1-area-0.0.0.0] network 3.3.3.9 0.0.0.0
[PE2-ospf-1-area-0.0.0.0] network 23.1.1.0 0.0.0.255
[PE2-ospf-1-area-0.0.0.0] quit
[PE2-ospf-1] quit

    After the configuration is complete, OSPF neighbor relationships can be set up between PE1, P, and PE2. Run the display ospf peer command. The command output shows that the neighbor status is Full. Run the display ip routing-table command. The command output shows that PEs have learned the routes to Loopback0 of each other.

    The information displayed on PE1 is used as an example.

    [PE1] display ip routing-table
Route Flags:
R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 11        Routes : 11 

  Destination/Mask    Proto  Pre  Cost     Flags NextHop         Interface

         1.1.1.9/32   Direct 0    0           D  127.0.0.1       LoopBack0
         2.2.2.9/32   OSPF   10   1           D  12.1.1.2        GigabitEthernet1/0/0
         3.3.3.9/32   OSPF   10   2           D  12.1.1.2        GigabitEthernet1/0/0
        12.1.1.0/24   Direct 0    0           D  12.1.1.1        GigabitEthernet1/0/0
        12.1.1.1/32   Direct 0    0           D  127.0.0.1       GigabitEthernet1/0/0
      12.1.1.255/32   Direct 0    0           D  127.0.0.1       GigabitEthernet1/0/0
        23.1.1.0/24   OSPF   10   2           D  12.1.1.2        GigabitEthernet1/0/0
        127.0.0.0/8   Direct 0    0           D  127.0.0.1       InLoopBack0
       127.0.0.1/32   Direct 0    0           D  127.0.0.1       InLoopBack0
 127.255.255.255/32   Direct 0    0           D  127.0.0.1       InLoopBack0 
 255.255.255.255/32   Direct 0    0           D  127.0.0.1       InLoopBack0

  3. Configure basic MPLS capabilities and MPLS LDP on the MPLS backbone network to set up LDP 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 1/0/0
[PE1-GigabitEthernet1/0/0] mpls
[PE1-GigabitEthernet1/0/0] mpls ldp
[PE1-GigabitEthernet1/0/0] quit

    # Configure P.

    [P] mpls lsr-id 2.2.2.9
[P] mpls
[P-mpls] quit
[P] mpls ldp
[P-mpls-ldp] quit
[P] interface gigabitethernet 1/0/0
[P-GigabitEthernet1/0/0] mpls
[P-GigabitEthernet1/0/0] mpls ldp
[P-GigabitEthernet1/0/0] quit
[P] interface gigabitethernet 2/0/0
[P-GigabitEthernet2/0/0] mpls
[P-GigabitEthernet2/0/0] mpls ldp
[P-GigabitEthernet2/0/0] quit

    # Configure PE2.

    [PE2] mpls lsr-id 3.3.3.9
[PE2] mpls
[PE2-mpls] quit
[PE2] mpls ldp
[PE2-mpls-ldp] quit
[PE2] interface gigabitethernet 2/0/0
[PE2-GigabitEthernet2/0/0] mpls
[PE2-GigabitEthernet2/0/0] mpls ldp
[PE2-GigabitEthernet2/0/0] quit

    After the configuration is complete, LDP sessions can be set up between PE1 and the P and between the P and PE2. Run the display mpls ldp session command. The command output shows that the Status field is Operational. Run the display mpls ldp lsp command. Information about the established LDP LSPs is displayed.

    The information displayed on PE1 is used as an example.

    [PE1] display mpls ldp session

 LDP Session(s) in Public Network
 Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
 A '*' before a session means the session is being deleted. 
 ------------------------------------------------------------------------------
 PeerID             Status      LAM  SsnRole  SsnAge      KASent/Rcv
 ------------------------------------------------------------------------------
 2.2.2.9:0          Operational DU   Active   0000:00:01  6/6
 ------------------------------------------------------------------------------
 TOTAL: 1 session(s) Found.


    [PE1] display mpls ldp lsp

 LDP LSP Information
 -------------------------------------------------------------------------------
 DestAddress/Mask   In/OutLabel   UpstreamPeer     NextHop     OutInterface   
 -------------------------------------------------------------------------------
 1.1.1.9/32         3/NULL        2.2.2.9          127.0.0.1   InLoop0    
*1.1.1.9/32         Liberal/1024                   DS/2.2.2.9 
 2.2.2.9/32         NULL/3        -                12.1.1.2    GE1/0/0
 2.2.2.9/32         1024/3        2.2.2.9          12.1.1.2    GE1/0/0
 3.3.3.9/32         NULL/1025     -                12.1.1.2    GE1/0/0
 3.3.3.9/32         1025/1025     2.2.2.9          12.1.1.2    GE1/0/0
 -------------------------------------------------------------------------------
 TOTAL: 5 Normal LSP(s) Found.
 TOTAL: 1 Liberal LSP(s) Found.
 TOTAL: 0 Frr LSP(s) Found.
 A '*' before an LSP means the LSP is not established                           
 A '*' before a Label means the USCB or DSCB is stale                           
 A '*' before a UpstreamPeer means the session is stale                         
 A '*' before a DS means the session is stale                                   
 A '*' before a NextHop means the LSP is FRR LSP

  4. Configure VPN instances on PEs and bind the instances to the interfaces connected to CEs.

    # Configure PE1.

    [PE1] ip vpn-instance vpna
[PE1-vpn-instance-vpna] ipv4-family
[PE1-vpn-instance-vpna-af-ipv4] route-distinguisher 100:100
[PE1-vpn-instance-vpna-af-ipv4] vpn-target 100:100 export-extcommunity
[PE1-vpn-instance-vpna-af-ipv4] vpn-target 100:100 import-extcommunity 
[PE1-vpn-instance-vpna-af-ipv4] quit
[PE1-vpn-instance-vpna] quit
[PE1] ip vpn-instance vpnb
[PE1-vpn-instance-vpnb] ipv4-family
[PE1-vpn-instance-vpnb-af-ipv4] route-distinguisher 300:300
[PE1-vpn-instance-vpnb-af-ipv4] vpn-target 200:200 export-extcommunity
[PE1-vpn-instance-vpnb-af-ipv4] vpn-target 200:200 import-extcommunity
[PE1-vpn-instance-vpnb-af-ipv4] quit 
[PE1-vpn-instance-vpnb] quit
[PE1] interface gigabitethernet 2/0/0
[PE1-GigabitEthernet2/0/0] ip binding vpn-instance vpna
[PE1-GigabitEthernet2/0/0] ip address 14.1.1.1 255.255.255.0
[PE1-GigabitEthernet2/0/0] quit
[PE1] interface gigabitethernet 3/0/0
[PE1-GigabitEthernet3/0/0] ip binding vpn-instance vpnb
[PE1-GigabitEthernet3/0/0] ip address 14.1.1.1 255.255.255.0
[PE1-GigabitEthernet3/0/0] quit

    # Configure PE2.

    [PE2] ip vpn-instance vpna
[PE2-vpn-instance-vpna] ipv4-family
[PE2-vpn-instance-vpna-af-ipv4] route-distinguisher 200:200
[PE2-vpn-instance-vpna-af-ipv4] vpn-target 100:100 export-extcommunity
[PE2-vpn-instance-vpna-af-ipv4] vpn-target 100:100 import-extcommunity 
[PE2-vpn-instance-vpna-af-ipv4] quit
[PE2-vpn-instance-vpna] quit
[PE2] ip vpn-instance vpnb
[PE2-vpn-instance-vpnb] ipv4-family
[PE2-vpn-instance-vpnb-af-ipv4] route-distinguisher 400:400
[PE2-vpn-instance-vpnb-af-ipv4] vpn-target 200:200 export-extcommunity
[PE2-vpn-instance-vpnb-af-ipv4] vpn-target 200:200 import-extcommunity 
[PE2-vpn-instance-vpnb-af-ipv4] quit
[PE2-vpn-instance-vpnb] quit
[PE2] interface gigabitethernet 1/0/0
[PE2-GigabitEthernet1/0/0] ip binding vpn-instance vpna
[PE2-GigabitEthernet1/0/0] ip address 34.1.1.1 255.255.255.0
[PE2-GigabitEthernet1/0/0] quit
[PE2] interface gigabitethernet 3/0/0
[PE2-GigabitEthernet3/0/0] ip binding vpn-instance vpnb
[PE2-GigabitEthernet3/0/0] ip address 34.1.1.1 255.255.255.0
[PE2-GigabitEthernet3/0/0] quit

    # Assign IP addresses to interfaces on CEs according to Figure 7-43.

    # Configure CE1. The configurations of CE2, CE3, and CE4 are similar to the configuration of CE1, and are not mentioned here.

    <Huawei> system-view
[Huawei] sysname CE1
[CE1] interface gigabitethernet 1/0/0
[CE1-GigabitEthernet1/0/0] ip address 14.1.1.2 24
[CE1-GigabitEthernet1/0/0] quit

    After the configuration is complete, run the display ip vpn-instance verbose command on the PEs to check the configuration of VPN instances. Each PE can ping its connected CE.

    The information displayed on PE1 is used as an example.

    [PE1] display ip vpn-instance verbose
 Total VPN-Instances configured : 2
 Total IPv4 VPN-Instances configured : 2
 Total IPv6 VPN-Instances configured : 0

 VPN-Instance Name and ID : vpna, 1
  Interfaces : GigabitEthernet2/0/0
 Address family ipv4
  Create date : 2012/07/25 00:58:17 UTC+08:00
  Up time : 0 days, 22 hours, 24 minutes and 53 seconds
  Route Distinguisher : 100:100
  Export VPN Targets :  100:100
  Import VPN Targets :  100:100
  Label Policy : label per route
  Log Interval : 5

 VPN-Instance Name and ID : vpnb, 2
  Interfaces : GigabitEthernet3/0/0
 Address family ipv4
  Create date : 2012/07/25 00:58:17 UTC+08:00
  Up time : 0 days, 22 hours, 24 minutes and 53 seconds
  Route Distinguisher : 300:300
  Export VPN Targets :  200:200
  Import VPN Targets :  200:200
  Label Policy : label per route
  Log Interval : 5
    [PE1] ping -vpn-instance vpna 14.1.1.2
  PING 14.1.1.2: 56  data bytes, press CTRL_C to break
    Reply from 14.1.1.2: bytes=56 Sequence=1 ttl=255 time=5 ms
    Reply from 14.1.1.2: bytes=56 Sequence=2 ttl=255 time=3 ms
    Reply from 14.1.1.2: bytes=56 Sequence=3 ttl=255 time=3 ms
    Reply from 14.1.1.2: bytes=56 Sequence=4 ttl=255 time=3 ms
    Reply from 14.1.1.2: bytes=56 Sequence=5 ttl=255 time=16 ms

  --- 14.1.1.2 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 3/6/16 ms

  5. Set up an MP-IBGP peer relationship between the PEs.

    # Configure PE1.

    [PE1] bgp 100
[PE1-bgp] peer 3.3.3.9 as-number 100
[PE1-bgp] peer 3.3.3.9 connect-interface loopback 0
[PE1-bgp] ipv4-family vpnv4
[PE1-bgp-af-vpnv4] peer 3.3.3.9 enable
[PE1-bgp-af-vpnv4] quit
[PE1-bgp] ipv4-family vpn-instance vpna
[PE1-bgp-vpna] import-route direct
[PE1-bgp-vpna] quit
[PE1-bgp] ipv4-family vpn-instance vpnb
[PE1-bgp-vpnb] import-route direct
[PE1-bgp-vpnb] quit
[PE1-bgp] quit

    # Configure PE2.

    [PE2] bgp 100
[PE2-bgp] peer 1.1.1.9 as-number 100
[PE2-bgp] peer 1.1.1.9 connect-interface loopback 0
[PE2-bgp] ipv4-family vpnv4
[PE2-bgp-af-vpnv4] peer 1.1.1.9 enable
[PE2-bgp-af-vpnv4] quit
[PE2-bgp] ipv4-family vpn-instance vpna
[PE2-bgp-vpna] import-route direct
[PE2-bgp-vpna] quit
[PE2-bgp] ipv4-family vpn-instance vpnb
[PE2-bgp-vpnb] import-route direct
[PE2-bgp-vpnb] quit
[PE2-bgp] quit

    After the configuration is complete, run the display bgp peer command on the PEs. The command output shows that a BGP peer relationship has been set up between the PEs.

    [PE1] display bgp peer
 BGP local router ID : 1.1.1.9
 Local AS number : 100
 Total number of peers : 1                 Peers in established state : 1

  Peer            V    AS  MsgRcvd  MsgSent  OutQ  Up/Down      State      PrefRcv

  3.3.3.9        4   100        3        3     0 00:01:08      Established       0

  6. On CE1, CE2, CE3, and CE4, configure static routes to their connected PEs.

    # Configure CE1. The configurations of CE2, CE3, and CE4 are similar to the configuration of CE1, and are not mentioned here.

    [CE1] ip route-static 0.0.0.0 0.0.0.0 gigabitethernet 1/0/0 14.1.1.1

  7. Verify the configuration.

    # Run the display ip routing-table vpn-instance command on the PEs to view the routes to the remote CEs.

    # The information displayed on PE1 is used as an example.

    [PE1] display ip routing-table vpn-instance vpna
Route Flags:
R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: vpna
         Destinations : 5        Routes : 5

  Destination/Mask    Proto  Pre  Cost     Flags NextHop         Interface

       14.1.1.0/24    Direct 0    0           D  14.1.1.1        GigabitEthernet2/0/0
       14.1.1.1/32    Direct 0    0           D  127.0.0.1       GigabitEthernet2/0/0
     14.1.1.255/32    Direct 0    0           D  127.0.0.1       GigabitEthernet2/0/0
       34.1.1.0/24    IBGP   255  0           RD 3.3.3.9         GigabitEthernet1/0/0
255.255.255.255/32    Direct 0    0           D  127.0.0.1       InLoopBack0 
    [PE1] display ip routing-table vpn-instance vpnb
Route Flags:
R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: vpnb
         Destinations : 5        Routes : 5

  Destination/Mask    Proto  Pre  Cost     Flags NextHop         Interface

       14.1.1.0/24    Direct 0    0           D  14.1.1.1        GigabitEthernet3/0/0
       14.1.1.1/32    Direct 0    0           D  127.0.0.1       GigabitEthernet3/0/0
     14.1.1.255/32    Direct 0    0           D  127.0.0.1       GigabitEthernet3/0/0
       34.1.1.0/24    IBGP   255  0           RD 3.3.3.9         GigabitEthernet1/0/0
255.255.255.255/32    Direct 0    0           D  127.0.0.1       InLoopBack0

    # Run the ping 34.1.1.2 command on CE1, and the ping is successful. Run the display interface command on PE2 to view traffic statistics on GE1/0/0 and GE3/0/0. The command output shows that there are packets passing through GE1/0/0 but no packet passing through GE3/0/0. This indicates that the two VPN instances have overlapping address spaces but they are isolated from each other.

Configuration Files

  • PE1 configuration file

    #
 sysname PE1
#
ip vpn-instance vpna
 ipv4-family
  route-distinguisher 100:100
  vpn-target 100:100 export-extcommunity
  vpn-target 100:100 import-extcommunity
#
ip vpn-instance vpnb
 ipv4-family
  route-distinguisher 300:300
  vpn-target 200:200 export-extcommunity
  vpn-target 200:200 import-extcommunity
#
 mpls lsr-id 1.1.1.9
 mpls
#
mpls ldp
#
interface GigabitEthernet1/0/0
 ip address 12.1.1.1 255.255.255.0
 mpls
 mpls ldp
# 
interface GigabitEthernet2/0/0
 ip binding vpn-instance vpna
 ip address 14.1.1.1 255.255.255.0
#
interface GigabitEthernet3/0/0
 ip binding vpn-instance vpnb
 ip address 14.1.1.1 255.255.255.0
#
interface LoopBack0
 ip address 1.1.1.9 255.255.255.255
# 
bgp 100
 peer 3.3.3.9 as-number 100
 peer 3.3.3.9 connect-interface LoopBack0
 #
 ipv4-family unicast
  undo synchronization
  peer 3.3.3.9 enable
 #
 ipv4-family vpnv4
  policy vpn-target
  peer 3.3.3.9 enable
 #
 ipv4-family vpn-instance vpna
  import-route direct
# 
ospf 1
 area 0.0.0.0
  network 12.1.1.0 0.0.0.255
  network 1.1.1.9 0.0.0.0
#
return

  • P configuration file

    #
 sysname P
#
 mpls lsr-id 2.2.2.9
 mpls
#
mpls ldp
# 
interface GigabitEthernet1/0/0
 ip address 12.1.1.2 255.255.255.0
 mpls
 mpls ldp
# 
interface GigabitEthernet2/0/0
 ip address 23.1.1.1 255.255.255.0
 mpls
 mpls ldp
# 
interface LoopBack0
 ip address 2.2.2.9 255.255.255.255
#
ospf 1
 area 0.0.0.0
  network 12.1.1.0 0.0.0.255
  network 23.1.1.0 0.0.0.255
  network 2.2.2.9 0.0.0.0
#
return

  • PE2 configuration file

    #
 sysname PE2
#
ip vpn-instance vpna
 ipv4-family
  route-distinguisher 200:200
  vpn-target 100:100 export-extcommunity
  vpn-target 100:100 import-extcommunity
#
ip vpn-instance vpnb
 ipv4-family
  route-distinguisher 400:400
  vpn-target 200:200 export-extcommunity
  vpn-target 200:200 import-extcommunity
#
 mpls lsr-id 3.3.3.9
 mpls
#
mpls ldp
#
interface GigabitEthernet1/0/0
 ip binding vpn-instance vpna
 ip address 34.1.1.1 255.255.255.0
# 
interface GigabitEthernet2/0/0
 ip address 23.1.1.2 255.255.255.0
 mpls
 mpls ldp
# 
interface GigabitEthernet3/0/0
 ip binding vpn-instance vpnb
 ip address 34.1.1.1 255.255.255.0
# 
interface LoopBack0
 ip address 3.3.3.9 255.255.255.255
#
bgp 100
 peer 1.1.1.9 as-number 100
 peer 1.1.1.9 connect-interface LoopBack0
 #
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.9 enable
 #
 ipv4-family vpnv4
  policy vpn-target
  peer 1.1.1.9 enable 
 #
 ipv4-family vpn-instance vpna
  import-route direct
 #
 ipv4-family vpn-instance vpnb
  import-route direct
#
ospf 1
 area 0.0.0.0
  network 23.1.1.0 0.0.0.255
  network 3.3.3.9 0.0.0.0
# 
return

  • CE1 configuration file

    #
 sysname CE1
#
interface GigabitEthernet1/0/0
 ip address 14.1.1.2 255.255.255.0
#
ip route-static 0.0.0.0 0.0.0.0 GigabitEthernet 1/0/0 14.1.1.1
#
return

  • CE2 configuration file

    #
 sysname CE2
#
interface GigabitEthernet1/0/0
 ip address 34.1.1.2 255.255.255.0
#
ip route-static 0.0.0.0 0.0.0.0 GigabitEthernet 1/0/0 34.1.1.1
#
return

  • CE3 configuration file

    #
 sysname CE3
#
interface GigabitEthernet1/0/0
 ip address 14.1.1.2 255.255.255.0
#
ip route-static 0.0.0.0 0.0.0.0 GigabitEthernet 1/0/0 14.1.1.1
#
return

  • CE4 configuration file

    #
 sysname CE4
#
interface GigabitEthernet1/0/0
 ip address 34.1.1.2 255.255.255.0
#
ip route-static 0.0.0.0 0.0.0.0 GigabitEthernet 1/0/0 34.1.1.1
#
return
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