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# Configuring a VPWS Instance

You must configure a VPWS instance for each L2VPN in which the router participates. From a configuration standpoint, a VPWS instance is simply a new L2VPN that you configure with additional VPWS L2VPN attributes.

Table 100 lists the commands that you use to configure a basic VPWS instance.

Table 100: Commands to Configure Basic VPWS Instances

l2vpn control-word | l2vpn route-target
l2vpn encapsulation-type | l2vpn sequencing
l2vpn local-site-id remote-site-id | l2vpn site-name site-id
l2vpn rd | l2vpn site-range

To configure a basic VPWS instance on the PE router:

1. Create the VPWS instance by configuring the encapsulation type for all interfaces in the L2VPN.

   You must issue this command before any other l2vpn commands.

   `
   host1(config)#l2vpn exampleco encapsulation-type ethernet
   `
2. Configure the maximum number of customer sites that can participate in the L2VPN.
   `
   host1(config)#l2vpn exampleco site-range 10
   `
3. Configure the name and ID number for the customer sites in the L2VPN instance.

   The site ID value must be greater than zero and be unique within the L2VPN for that customer site. This is not true for a multihomed customer site. See Configuring BGP Multihoming for VPWS for more information.

   `
   host1(config)#l2vpn exampleco site-name westford site-id 1
   `
4. Configure a route distinguisher for the L2VPN.

   In this example, the first number in the route distinguisher (100) is the number of the autonomous system (AS). The second number in the route distinguisher (11) uniquely identifies the L2VPN instance within that AS.

   `
   host1(config)#l2vpn exampleco rd 100:11
   `
5. Create or add a route target to the import and export lists of the L2VPN’s route-target extended community.

   The PE router uses the lists to determine which routes are imported into the VPWS instance.

   `
   host1(config)#l2vpn exampleco route-target both 100:1
   `
6. Specify the local preference for use of the control word and sequencing for the layer 2 packets encapsulated in the MPLS packets that are sent to the remote PE router.
   `
   host1(config)#l2vpn exampleco control-word
   host1(config)#l2vpn exampleco sequencing
   `

#### Related Topics

- l2vpn control-word
- l2vpn encapsulation-type
- l2vpn rd
- l2vpn route-target
- l2vpn sequencing
- l2vpn site-name site-id
- l2vpn site-range

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