Example for Configuring VPN-based L2TP Tunnels for User Access

This section provides an example for configuring VPN-based L2TP tunnels for user access.

Networking Requirements

On the network shown in Figure 1, a carrier expects to use private network addresses to establish L2TP tunnels for saving public network addresses.

Figure 1 Networking for configuring VPN-based L2TP tunnels for user access

Interfaces 1 through 3 in this example represent GE 0/1/1, GE 0/1/8.100, and GE 0/1/2, respectively.



Device

Tunnel Interface

IP Address

Loopback Interface

IP Address

Device A

GE 0/1/1

10.0.0.1/24

Loopback 0

1.1.1.1

Device B

GE 0/1/1

10.0.0.2/24

Loopback 0

3.3.3.3

Device B

GE 0/1/2

10.10.0.2/24

Loopback 1

4.4.4.4

Device C

GE 0/1/1

10.10.0.1/24

Loopback 1

2.2.2.2

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure a dial-up connection on the user side.

  2. Configure the LACs.

  3. Configure the LNS.

Data Preparation

To complete the configuration, you need the following data:

  • Usernames and passwords of PC1 and PC2

  • Tunnel password, tunnel name on the LNS, and tunnel names on the LACs

  • VPN instance names

  • Virtual template IDs and L2TP group IDs

  • Number, range, and address mask of the remote address pool

Procedure

  1. Configure a dial-up connection on the user side.

    To create a dial-up connection, dial the Device A access number for receiving the addresses assigned by LNSs.

    Enter the username user1@isp1 and password (already registered on the LNS) in the displayed dial-up terminal window on PC1.

    Enter the username user1@isp2 and password (already registered on the LNS) in the displayed dial-up terminal window on PC2.

  2. Configure Device A (LAC).

    # Create a virtual template and configure a PPP authentication mode for it.

    <Device> system-view
[~Device] sysname DeviceA
[*DeviceA] interface virtual-template 1
[*DeviceA-Virtual-Template1] ppp authentication-mode chap
[*DeviceA-Virtual-Template1] commit
[~DeviceA-Virtual-Template1] quit

    # Bind virtual template 1 to GE 0/1/8.100.

    [~DeviceA] interface gigabitethernet 0/1/8.100
[*DeviceA-GigabitEthernet0/1/8.100] pppoe-server bind virtual-template 1
[*DeviceA-GigabitEthernet0/1/8.100] user-vlan 1 100
[*DeviceA-GigabitEthernet0/1/8.100-vlan-1-100] commit
[~DeviceA-GigabitEthernet0/1/8.100-vlan-1-100] quit

    # Configure BAS.

    [~DeviceA-GigabitEthernet0/1/8.100] bas
[*DeviceA-GigabitEthernet0/1/8.100-bas] access-type layer2-subscriber
[*DeviceA-GigabitEthernet0/1/8.100-bas] authentication-method ppp
[*DeviceA-GigabitEthernet0/1/8.100-bas] commit
[~DeviceA-GigabitEthernet0/1/8.100-bas] quit
[~DeviceA-GigabitEthernet0/1/8.100] quit

    # Create a VPN instance.

    [~DeviceA] ip vpn-instance vrf1
[*DeviceA-vpn-instance-vrf1] route-distinguisher 100:1
[*DeviceA-vpn-instance-vrf1] apply-label per-instance
[*DeviceA-vpn-instance-vrf1] vpn-target 100:1 both
[*DeviceA–vpn-instance-vrf1] commit
[~DeviceA–vpn-instance-vrf1] quit

    # Bind the LAC interface connected to the LNS to the VPN instance.

    [~DeviceA] interface gigabitethernet0/1/1
[*DeviceA-GigabitEthernet0/1/1] ip binding vpn-instance vrf1
[*DeviceA--GigabitEthernet0/1/1] ip address 10.0.0.1 255.255.255.0
[*DeviceA--GigabitEthernet0/1/1] commit
[~DeviceA--GigabitEthernet0/1/1] quit

    # Create loopback 0 and bind it to the VPN instance.

    [~DeviceA] interface loopback0
[*DeviceA-LoopBack0] ip binding vpn-instance vrf1
[*DeviceA-LoopBack0] ip address 1.1.1.1 255.255.255.255
[*DeviceA-LoopBack0] commit
[~DeviceA-LoopBack0] quit

    # Configure an L2TP group and L2TP attributes.

    [~DeviceA] l2tp enable
[*DeviceA] commit
[~DeviceA] l2tp-group lac1
[*DeviceA-l2tp-lac1] tunnel name lac1
[*DeviceA-l2tp-lac1] start l2tp ip 3.3.3.3
[*DeviceA-l2tp-lac1] tunnel authentication
[*DeviceA-l2tp-lac1] tunnel password cipher root@123
[*DeviceA-l2tp-lac1] tunnel source loopback0
[*DeviceA-l2tp-lac1] commit
[~DeviceA-l2tp-lac1] quit

    # Configure a RADIUS server group.

    [~DeviceA] radius-server group radius1
[*DeviceA-radius-radius1] radius-server authentication 10.0.0.249 1812
[*DeviceA-radius-radius1] radius-server accounting 10.0.0.249 1813
[*DeviceA-radius-radius1] radius-server shared-key itellin
[*DeviceA-radius-radius1] commit
[~DeviceA-radius-radius1] quit

    # Configure a user access domain.

    [~DeviceA] aaa
[*DeviceA-aaa] domain isp1
[*DeviceA-aaa-domain-isp1] l2tp-group lac1
[*DeviceA-aaa-domain-isp1] radius-server group radius1
[*DeviceA-aaa-domain-isp1] authentication-scheme default1
[*DeviceA-aaa-domain-isp1] accounting-scheme default1
[* DeviceA-aaa-domain-isp1] commit
[~DeviceA-aaa-domain-isp1] quit
[~DeviceA-aaa] quit

    # Configure a static route to the LNS.

    [~DeviceA] ip route-static vpn-instance vrf1 3.3.3.3 255.255.255.255 10.0.0.2

  3. Configure Device C (LAC).

    # Create a virtual template and configure a PPP authentication mode for it.

    <Device> system-view
[~Device] sysname DeviceC
[*DeviceC] interface virtual-template 1
[*DeviceC-Virtual-Template1] ppp authentication-mode chap
[*DeviceC-Virtual-Template1] commit
[~DeviceC-Virtual-Template1] quit

    # Bind virtual template 1 to GE 0/1/8.100.

    [~DeviceC] interface gigabitethernet 0/1/8.100
[*DeviceC-GigabitEthernet0/1/8.100] pppoe-server bind virtual-template 1
[*DeviceA-GigabitEthernet0/1/8.100] user-vlan 1 100
[*DeviceA-GigabitEthernet0/1/8.100-vlan-1-100] commit
[~DeviceA-GigabitEthernet0/1/8.100-vlan-1-100] quit

    # Configure BAS.

    [~DeviceA-GigabitEthernet0/1/8.100] bas
[*DeviceA-GigabitEthernet0/1/8.100-bas] access-type layer2-subscriber
[*DeviceA-GigabitEthernet0/1/8.100-bas] authentication-method ppp
[*DeviceA-GigabitEthernet0/1/8.100-bas] commit
[~DeviceA-GigabitEthernet0/1/8.100-bas] quit
[~DeviceA-GigabitEthernet0/1/8.100] quit

    # Create a VPN instance.

    [DeviceC] ip vpn-instance vrf2
[~DeviceC] ip vpn-instance vrf2
[*DeviceC-vpn-instance-vrf2] route-distinguisher 100:2
[*DeviceC-vpn-instance-vrf2] apply-label per-instance
[*DeviceC-vpn-instance-vrf2] vpn-target 100:2 both
[*DeviceC–vpn-instance-vrf2] commit
[~DeviceC–vpn-instance-vrf2] quit

    # Bind the LAC interface connected to the LNS to the VPN instance.

    [DeviceC] interface gigabitethernet0/1/1
[~DeviceC] interface gigabitethernet0/1/1
[*DeviceC-GigabitEthernet0/1/1] ip binding vpn-instance vrf2
[*DeviceC-GigabitEthernet0/1/1] ip address 10.10.0.1 255.255.255.0
[*DeviceC-GigabitEthernet0/1/1] commit
[~DeviceC-GigabitEthernet0/1/1] quit

    # Create loopback 1 and bind it to the VPN instance.

    [~DeviceC] interface loopback1
[*DeviceC-LoopBack1] ip binding vpn-instance vrf2
[*DeviceC-LoopBack1] ip address 2.2.2.2 255.255.255.255
[*DeviceC-LoopBack1] commit
[~DeviceC-LoopBack1] quit

    # Configure an L2TP group and L2TP attributes.

    [~DeviceC] l2tp enable
[~DeviceC] l2tp-group lac2
[*DeviceC-l2tp-lac2] tunnel name lac2
[*DeviceC-l2tp-lac2] start l2tp ip 4.4.4.4
[*DeviceC-l2tp-lac2] tunnel authentication
[*DeviceC-l2tp-lac2] tunnel password cipher root@123
[*DeviceC-l2tp-lac2] tunnel source loopback1
[*DeviceC-l2tp-lac2] commit
[~DeviceC-l2tp-lac2] quit

    # Configure a RADIUS server group.

    [~DeviceC] radius-server group radius1
[*DeviceC-radius-radius1] radius-server authentication 10.10.0.249 1812
[*DeviceC-radius-radius1] radius-server accounting 10.10.0.249 1813
[*DeviceC-radius-radius1] radius-server shared-key itellin
[*DeviceC-radius-radius1] commit
[~DeviceC-radius-radius1] quit

    # Configure a user access domain.

    [~DeviceC] aaa
[*DeviceC-aaa] domain isp2
[*DeviceC-aaa-domain-isp2] l2tp-group lac2
[*DeviceC-aaa-domain-isp2] radius-server group radius1
[*DeviceC-aaa-domain-isp2] authentication-scheme default1
[*DeviceC-aaa-domain-isp2] accounting-scheme default1
[*DeviceC-aaa-domain-isp2] commit
[~DeviceC-aaa-domain-isp2] quit
[~DeviceC-aaa] quit

    # Configure a static route to the LNS.

    [~DeviceC] ip route-static vpn-instance vrf2 4.4.4.4 255.255.255.255 10.10.0.2

  4. Configure Device B (LNS)

    # Create two VPN instances.

    [~DeviceB] ip vpn-instance vrf1
[*DeviceB-vpn-instance-vrf1] route-distinguisher 100:1
[*DeviceB-vpn-instance-vrf1] apply-label per-instance
[*DeviceB-vpn-instance-vrf1] vpn-target 100:1 both
[*DeviceB–vpn-instance-vrf1] commit
[~DeviceB–vpn-instance-vrf1] quit
[~DeviceB] ip vpn-instance vrf2
[*DeviceB-vpn-instance-vrf2] route-distinguisher 100:2
[*DeviceB-vpn-instance-vrf2] apply-label per-instance
[*DeviceB-vpn-instance-vrf2] vpn-target 100:2 both
[*DeviceB–vpn-instance-vrf2] commit
[~DeviceB–vpn-instance-vrf2] quit

    # Create two interfaces and bind each to a VPN instance.

    [~DeviceB] interface gigabitethernet0/1/1
[*DeviceB-GigabitEthernet0/1/1] ip binding vpn-instance vrf1
[*DeviceB--GigabitEthernet0/1/1] ip address 10.0.0.2 255.255.255.0
[*DeviceB--GigabitEthernet0/1/1] commit
[~DeviceB--GigabitEthernet0/1/1] quit
[~DeviceB] interface gigabitethernet0/1/2
[*DeviceB-GigabitEthernet0/1/2] ip binding vpn-instance vrf2
[*DeviceB-GigabitEthernet0/1/2] ip address 10.10.0.2 255.255.255.0
[*DeviceB-GigabitEthernet0/1/2] commit
[~DeviceB-GigabitEthernet0/1/2] quit

    # Create loopback interfaces and bind each to a VPN instance.

    [~DeviceB] interface loopback0
[*DeviceB-LoopBack0] ip binding vpn-instance vrf1
[*DeviceB-LoopBack0] ip address 3.3.3.3 255.255.255.255
[*DeviceB-LoopBack0] commit
[~DeviceB-LoopBack0] quit
[~DeviceB] interface loopback1
[*DeviceB-LoopBack1] ip binding vpn-instance vrf2
[*DeviceB-LoopBack1] ip address 4.4.4.4 255.255.255.255
[*DeviceB-LoopBack1] commit
[~DeviceB-LoopBack1] quit

    # Create a virtual template and configure a PPP authentication mode for it.

    [~DeviceB] interface virtual-template 1
[*DeviceB-Virtual-Template1] ppp authentication-mode chap
[*DeviceB-Virtual-Template1] commit
[~DeviceB-Virtual-Template1] quit

    # Enable L2TP and configure L2TP groups.

    [~DeviceB] l2tp enable
[*DeviceB] commit
[~DeviceB] l2tp-group lns1
[*DeviceB-l2tp-lns1] tunnel name lns1
[*DeviceB-l2tp-lns1] allow l2tp virtual-template 1 remote lac1
[*DeviceB-l2tp-lns1] tunnel authentication
[*DeviceB-l2tp-lns1] tunnel password cipher root@123
[*DeviceB-l2tp-lns1] commit
[~DeviceB-l2tp-lns1] quit
[~DeviceB] l2tp-group lns2
[*DeviceB-l2tp-lns1] tunnel name lns2
[*DeviceB-l2tp-lns1] allow l2tp virtual-template 1 remote lac2
[*DeviceB-l2tp-lns1] tunnel authentication
[*DeviceB-l2tp-lns1] tunnel password cipher root@123
[*DeviceB-l2tp-lns1] commit
[~DeviceB-l2tp-lns1] quit

    # Create an LNS group named group1, and bind the tunnel board and tunnel interfaces to the LNS group.

    [~DeviceB] lns-group group1
[*DeviceB-lns-group-group1] bind slot 1 
[*DeviceB-lns-group-group1] bind source LoopBack0
[*DeviceB-lns-group-group1] bind source LoopBack1
[*DeviceB-lns-group-group1] commit
[~DeviceB-lns-group-group1] quit

    # Configure address pools used to assign addresses to users.

    [~DeviceB] ip pool pool1 bas local
[*DeviceB-ip-pool-pool1] gateway 10.1.10.1 255.255.255.0
[*DeviceB-ip-pool-pool1] section 0 10.1.10.10 10.1.10.100
[*DeviceB-ip-pool-pool1] commit
[~DeviceB-ip-pool-pool1] quit
[~DeviceB] ip pool pool2 bas local
[*DeviceB-ip-pool-pool2] gateway 10.1.155.1 255.255.255.0
[*DeviceB-ip-pool-pool2] section 0 10.1.155.10 10.1.155.100
[*DeviceB-ip-pool-pool2] commit
[~DeviceB-ip-pool-pool2] quit

    # Configure a RADIUS server group.

    [~DeviceB] radius-server group radius1
[*DeviceB-radius-radius1] radius-server authentication 10.1.20.1 1812
[*DeviceB-radius-radius1] radius-server accounting 10.1.20.1 1813
[*DeviceB-radius-radius1] radius-server shared-key itellin
[*DeviceB-radius-radius1] commit
[~DeviceB-radius-radius1] quit

    # Configure user access domains.

    [~DeviceB] aaa
[*DeviceB-aaa] domain isp1
[*DeviceB-aaa-domain-isp1] radius-server group radius1
[*DeviceB-aaa-domain-isp1] authentication-scheme default1
[*DeviceB-aaa-domain-isp1] accounting-scheme default1
[*DeviceB-aaa-domain-isp1] ip-pool pool1
[*DeviceB-aaa-domain-isp1] commit
[~DeviceB-aaa-domain-isp1] quit
[~DeviceB-aaa] domain isp2
[*DeviceB-aaa-domain-isp2] radius-server group radius1
[*DeviceB-aaa-domain-isp2] authentication-scheme default1
[*DeviceB-aaa-domain-isp2] accounting-scheme default1
[*DeviceB-aaa-domain-isp2] ip-pool pool2
[*DeviceB-aaa-domain-isp2] commit
[~DeviceB-aaa-domain-isp2] quit
[~DeviceB-aaa] quit

    # Configure static routes to the LACs.

    [~DeviceB] ip route-static vpn-instance vrf1 1.1.1.1 255.255.255.255 10.0.0.1
[~DeviceB] ip route-static vpn-instance vrf2 2.2.2.2 255.255.255.255 10.10.0.1

  5. Verify the configuration.

    [~DeviceA] ping -vpn-instance vrf1 3.3.3.3
PING 3.3.3.3: 56  data bytes, press CTRL_C to break                           
    Reply from 3.3.3.3: bytes=56 Sequence=1 ttl=255 time=12 ms                  
    Reply from 3.3.3.3: bytes=56 Sequence=2 ttl=255 time=10 ms                  
    Reply from 3.3.3.3: bytes=56 Sequence=3 ttl=255 time=5 ms                   
    Reply from 3.3.3.3: bytes=56 Sequence=4 ttl=255 time=8 ms                   
                                                                                
  --- 3.3.3.3 ping statistics ---                                               
    4 packet(s) transmitted                                                     
    4 packet(s) received                                                        
    0.00% packet loss                                                           
    round-trip min/avg/max = 5/8/12 ms                           
[~DeviceC] ping -vpn-instance vrf2 4.4.4.4
PING 4.4.4.4: 56  data bytes, press CTRL_C to break                           
    Reply from 4.4.4.4: bytes=56 Sequence=1 ttl=255 time=12 ms                  
    Reply from 4.4.4.4: bytes=56 Sequence=2 ttl=255 time=10 ms                  
    Reply from 4.4.4.4: bytes=56 Sequence=3 ttl=255 time=5 ms                   
    Reply from 4.4.4.4: bytes=56 Sequence=4 ttl=255 time=8 ms                   
                                                                                
  --- 4.4.4.4 ping statistics ---                                               
    4 packet(s) transmitted                                                     
    4 packet(s) received                                                        
    0.00% packet loss                                                           
    round-trip min/avg/max = 5/8/12 ms                           
[~DeviceA] test l2tp-tunnel l2tp-group lac1 ip-address 3.3.3.3
Testing L2TP tunnel connectivity now....... 
Test L2TP tunnel connectivity success.
[~DeviceC] test l2tp-tunnel l2tp-group lac2 ip-address 4.4.4.4
Testing L2TP tunnel connectivity now....... 
Test L2TP tunnel connectivity success.

Configuration Files

  • Device A configuration file

    #
 sysname DeviceA
#
 l2tp enable
#
radius-server group radius1
 radius-server authentication 10.0.0.249 1812 
 radius-server accounting 10.0.0.249 1813 
 radius-server shared-key %^%#vS%796FO7%C~pB%CR=q;j}gSCqR-X6+P!.DYI@)%^% 
#
interface Virtual-Template1
ppp authentication-mode chap
#
interface GigabitEthernet0/1/8.100
 undo shutdown
 pppoe-server bind Virtual-Template 1
 user-vlan 1 100
 bas
  access-type layer2-subscriber
#
ip vpn-instance vrf1
route-distinguisher 100:1
 apply-label per-instance
 vpn-target 100:1 export-extcommunity
 vpn-target 100:1 import-extcommunity
#
interface LoopBack0
 ip binding vpn-instance vrf1
 ip address 1.1.1.1 255.255.255.255
l2tp-group lac1
 tunnel password cipher %@%##!!!!!!!!!"!!!!"!!!!(!!!!1];16qfZ81fv"uMoKKZ.1k"`AO!X2K2N.b~'NB^V!!!!!!!!!!1!!!!o/4J(q"J1F.!K9%M!6x8%@%#
 tunnel name lac1
 start l2tp ip 3.3.3.3
 tunnel source LoopBack0
#
aaa
domain isp1
  authentication-scheme default1
  accounting-scheme default1
  radius-server group radius1
  l2tp-group lac1
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip binding vpn-instance vrf1
 ip address 10.0.0.1 255.255.255.0
#
 ip route-static vpn-instance vrf1 3.3.3.3 255.255.255.255 10.0.0.2
#
return

  • Device C configuration file

    #
 sysname DeviceC
#
 l2tp enable
#
radius-server group radius1
 radius-server authentication 10.10.0.249 1812 
 radius-server accounting 10.10.0.249 1813 
 radius-server shared-key %^%#vS%796FO7%C~pB%CR=q;j}gSCqR-X6+P!.DYI@)%^% 
#
interface Virtual-Template1
ppp authentication-mode chap
#
interface GigabitEthernet0/1/8.100
 undo shutdown
 pppoe-server bind Virtual-Template 1
 user-vlan 1 100
 bas
  access-type layer2-subscriber
#
ip vpn-instance vrf2
route-distinguisher 200:1
 apply-label per-instance
 vpn-target 200:1 export-extcommunity
 vpn-target 200:1 import-extcommunity
#
interface LoopBack0
 ip binding vpn-instance vrf2
 ip address 2.2.2.2 255.255.255.255
 l2tp-group lac2
 tunnel password cipher %@%##!!!!!!!!!"!!!!"!!!!(!!!!1];16qfZ81fv"uMoKKZ.1k"`AO!X2K2N.b~'NB^V!!!!!!!!!!1!!!!o/4J(q"J1F.!K9%M!6x8%@%#
 tunnel name lac2
 start l2tp ip 4.4.4.4
 tunnel source LoopBack0
#
aaa
domain isp2
  authentication-scheme default1
  accounting-scheme default1
  radius-server group radius1
  l2tp-group lac2
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip binding vpn-instance vrf2
 ip address 10.10.0.1 255.255.255.0
#
 ip route-static vpn-instance vrf2 4.4.4.4 255.255.255.255 10.10.0.2
#
return

  • Device B configuration file

    #
 sysname DeviceB
#
 l2tp enable
#
radius-server group radius1
 radius-server authentication 10.1.20.1 1812 
 radius-server accounting 10.1.20.1 1813 
 radius-server shared-key %^%#vS%796FO7%C~pB%CR=q;j}gSCqR-X6+P!.DYI@)%^% 
#
interface Virtual-Template1
ppp authentication-mode chap
#
ip vpn-instance vrf1
route-distinguisher 100:1
 apply-label per-instance
 vpn-target 100:1 export-extcommunity
 vpn-target 100:1 import-extcommunity
#
ip vpn-instance vrf2
route-distinguisher 100:2
 apply-label per-instance
 vpn-target 100:2 export-extcommunity
 vpn-target 100:2 import-extcommunity
#
interface LoopBack0
 ip binding vpn-instance vrf1
 ip address 3.3.3.3 255.255.255.255
#
interface LoopBack1
 ip binding vpn-instance vrf2
 ip address 4.4.4.4 255.255.255.255
#
l2tp-group lns1
 allow l2tp virtual-template 1 remote lac1
 tunnel password cipher %@%##!!!!!!!!!"!!!!"!!!!(!!!!1];16qfZ81fv"uMoKKZ.1k"`AO!X2K2N.b~'NB^V!!!!!!!!!!1!!!!o/4J(q"J1F.!K9%M!6x8%@%#
 tunnel name lns1
#
l2tp-group lns2
 allow l2tp virtual-template 1 remote lac2
 tunnel password cipher %@%##!!!!!!!!!"!!!!"!!!!(!!!!1];16qfZ81fv"uMoKKZ.1k"`AO!X2K2N.b~'NB^V!!!!!!!!!!1!!!!o/4J(q"J1F.!K9%M!6x8%@%#
 tunnel name lns2
#
lns-group group1
 bind slot 1 
 bind source LoopBack0
 bind source LoopBack1
#
ip pool pool1 bas local
 gateway 10.1.10.1 255.255.255.0
 section 0 10.1.10.10 10.10.0.100
#
ip pool pool2 bas local
 gateway 10.1.155.1 255.255.255.0
 section 0 10.1.155.10 10.10.0.100
#
aaa
domain  isp1
  radius-server group  radius1
  authentication-scheme   default1
  accounting-scheme   default1
  ip-pool pool1
domain  isp2
  radius-server group  radius1
  authentication-scheme   default1
  accounting-scheme   default1
  ip-pool pool2
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip binding vpn-instance vrf1
 ip address 10.0.0.2 255.255.255.0
#
interface GigabitEthernet0/1/2
 undo shutdown
 ip binding vpn-instance vrf2
 ip address 10.10.0.2 255.255.255.0
#
 ip route-static vpn-instance vrf1 1.1.1.1 255.255.255.255 10.0.0.1
 ip route-static vpn-instance vrf2 2.2.2.2 255.255.255.255 10.10.0.1
#
return
Parent Topic: Configuration Examples for L2TP Access
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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