Example for Configuring an L2TPv3 Connection in Local Switching Mode to Carry Services

This section provides an example for configuring an L2TPv3 connection in local switching mode to carry services. An L2TPv3 connection in local switching mode can be configured for two CEs connecting to the same PE to exchange packets. The PE, which only transparently transmits service packets, allows service packets to use L2TPv3 encapsulation type.

Networking Requirements

On the network shown in Figure 1, L2TPv3 enables PE1 to function as a local switching device to forward packets through Layer 2 EVC sub-interfaces. This implementation allows CE1 and CE2 to exchange packets without using a VPN.

An L2TPv3 connection in local switching mode supports the following service access modes: whole-interface mode, C-tag termination mode, S-tag termination mode, and S-tag+C-tag termination mode. The L2TPv3 tunnel configurations for different service access modes are similar. The following configuration example uses the C-tag termination mode.

Figure 1 Networking for an L2TPv3 connection in local switching mode

Device	Interface	IP Address
CE1	GE0/1/1	-
PE1	GE0/1/1.4	-
PE1	GE0/1/2.4	-
CE2	GE0/1/1	-

Configuration Roadmap

The configuration roadmap is as follows:

Enable L2TPv3 on PE1.
Configure the inbound and outbound interfaces for the L2TPv3 connection on PE1.

Data Preparation

To complete the configuration, you need the following data:

Types and numbers of L2TPv3 interfaces
Inbound and outbound interfaces for the L2TPv3 connection

Procedure

Enable L2TPv3 on PE1.

<HUAWEI> system-view
[~HUAWEI] sysname PE1
[*HUAWEI] commit
[~PE1] l2tpv3 enable
[*PE1] commit

Configure L2TPv3 functions on PE1.

# Configure PE1 to allow services to access the L2TPv3 connection in C-tag termination mode.

[~PE1] interface gigabitethernet0/1/1.4 mode 12
[*PE1-Gigabitethernet0/1/1.4] encapsulation dot1q vid 2
[*PE1-Gigabitethernet0/1/1.4] rewrite pop single
[*PE1-Gigabitethernet0/1/1.4] commit
[*PE1-Gigabitethernet0/1/1.4] quit
[*PE1] interface gigabitethernet0/1/9.4 mode 12
[*PE1-Gigabitethernet0/1/9.4] encapsulation dot1q vid 2
[*PE1-Gigabitethernet0/1/9.4] rewrite pop single
[*PE1-Gigabitethernet0/1/9.4] commit
[*PE1-Gigabitethernet0/1/1.4] quit
[*PE1] l2tpv3 local connection dot1q interface GigabitEthernet0/1/1.4 out-interface GigabitEthernet0/1/9.4

Configure a VLAN service on CE1.

<HUAWEI> system-view
[~HUAWEI] sysname CE1
[*HUAWEI] commit
[~CE1] interface gigabitethernet 0/1/1
[~CE1-GigabitEthernet0/1/1] portswitch
[*CE1-GigabitEthernet0/1/1] undo shutdown
[*CE1-GigabitEthernet0/1/1] port link-type trunk
[*CE1-GigabitEthernet0/1/1] port trunk allow-pass vlan 2
[*CE1-GigabitEthernet0/1/1] quit
[*CE1] commit

Configure a VLAN service on CE2.

[~CE2] interface gigabitethernet 0/1/1
[~CE2-GigabitEthernet0/1/1] portswitch
[*CE2-GigabitEthernet0/1/1] undo shutdown
[*CE2-GigabitEthernet0/1/1] port link-type trunk
[*CE2-GigabitEthernet0/1/1] port trunk allow-pass vlan 2
[*CE2-GigabitEthernet0/1/1] quit
[*CE2] commit

Configuration Files

CE1 configuration file

#
sysname CE1
#
vlan 2
#
interface GigabitEthernet0/1/1
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 2
#
return

PE1 configuration file

#
sysname PE1
#
l2tpv3 enable
l2tpv3 local connection dot1q interface GigabitEthernet0/1/1.4 out-interface GigabitEthernet0/1/9.4
#
interface GigabitEthernet0/1/1.4 mode l2
 encapsulation dot1q vid 2
#
interface GigabitEthernet0/1/9.4 mode l2
 encapsulation dot1q vid 2
#

CE2 configuration file

#
sysname CE2
#
vlan 2
#
interface GigabitEthernet0/1/1
 portswitch
 undo shutdown
 port link-type trunk
 port trunk allow-pass vlan 2
#
return