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Carrier-of-Carriers VPN Example—Customer Provides VPN Service
In this example, the carrier customer must run some form of MPLS (Resource Reservation Protocol [RSVP] or LDP) on its network to provide VPN services to the end customer. In the example below, Router B and Router I act as PE routers (or switches), and a functioning MPLS path is required between these routers if they exchange VPN-IPv4 routes.
For configuration information see the following sections:
Network Topology for Carrier-of-Carriers Service
A carrier-of-carriers service allows an Internet service provider (ISP) to connect to a transparent outsourced backbone at multiple locations.
Figure 1 shows the network topology in this carrier-of-carriers example.
Configuration for Router A
In this example, Router A acts as the CE router for the end customer. Configure a default family inet BGP session on Router A:
Configuration for Router B
Because Router B is the PE router for the end customer CE router (Router A), you need to configure a routing instance (vpna). Configure the labeled-unicast statement on the IBGP session to Router D, and configure family-inet-vpn for the IBGP session to the other side of the network with Router I:
Configuration for Router C
Configure Router C as a label-swapping router within the local AS:
Configuration for Router D
Router D acts as the CE router for the VPN services provided by the AS 10023 network. In the BGP group configuration for group int, which handles traffic to Router B (10.255.14.179), you include the labeled-unicast statement. You also need to configure the BGP group to-isp-red to send labeled internal routes to the PE router (Router E).
Configuration for Router E
Router E and Router H are PE routers. Configure a PE-router-to-PE-router BGP session to allow VPN-IPv4 routes to pass between these two PE routers. Configure the routing instance on Router E to send labeled routes to the CE router (Router D).
Configure Router E:
Configuration for Router F
Configure Router F to swap labels for routes running through its interfaces:
Configuration for Router G
Configure Router G:
Configuration for Router H
The configuration for Router H is similar to the configuration for Router E:
Configuration for Router I
Router I acts as the PE router for the end customer. The configuration that follows is similar to the configuration for Router B:
Configuration for Router J
Configure Router J to swap labels for routes running through its interfaces:
Configuration for Router K
The configuration for Router K is similar to the configuration for Router D:
Configuration for Router L
In this example, Router L is the end customer’s CE router. Configure a default family inet BGP session on Router L: