domain-tag
■ Use to set the VPN route tag for an OSPF VRF on a PE router.
■ The default value is a 32-bit number based on the AS number of the BGP/MPLS
VPN backbone, with the first 16 bits set to 1110 0000 0000 0000, followed by
the 16 bits representing the AS number.
■ Example
host1:default:ospf2(config-router)#domain-tag 1200
■ Use the no version to restore the default value.
■ See domain-tag.
Configuring VPLS
You can configure one or more instances of the Virtual Private LAN Service (VPLS),
referred to as VPLS instances, on the router. VPLS is a BGP-MPLS application that has
much in common with BGP/MPLS VPNs. VPLS employs a layer 2 virtual private
network (VPN) to connect multiple individual LANs across a service provider’s MPLS
core network. The geographically dispersed multiple LANs functions as a single virtual
LAN.
For details about configuring and using VPLS, see “Configuring VPLS” on page 589.
Configuring L2VPNs
You can configure one or more instances of a Layer 2 Virtual Private Network (L2VPN),
referred to as L2VPN instances, on the router. An L2VPN, sometimes referred to as
Virtual Private Wire Service (VPWS), is a BGP-MPLS application that has much in
common with BGP/MPLS VPNs. L2VPNs employ layer 2 services over MPLS to build
a topology of point-to-point connections that connect end customer sites in a VPN.
L2VPNs provide an alternative to private networks that have been provisioned by
means of dedicated leased lines or by means of layer 2 virtual circuits that employ
ATM or Frame Relay. L2VPNs enable the sharing of a provider’s core network
infrastructure between IP and L2VPN services, reducing the cost of providing those
services.
For details about configuring and using L2VPNs, see “Configuring VPWS” on page 657.
Monitoring BGP/MPLS VPNs
To view BGP/MPLS VPN settings, you can issue the following show commands as
well as any of the show ip bgp commands and some of the show bgp ipv6 commands
described in “Configuring BGP Routing” on page 3. See “Configuring MPLS” on
page 267, for information about show commands to monitor MPLS settings.
Use the debug ip mbgp command to get information about problems with BGP or
the network.
Configuring VPLS ■ 487
Chapter 5: Configuring BGP-MPLS Applications
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