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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 4 Configuring Multiprotocol Label Switching
Half-Duplex VRF
Configuration Tasks for Half-Duplex VRF
To configure the Half-Duplex VRF feature, perform the following configuration tasks:
• Configuring Upstream and Downstream VRFs on the L2TP Access Concentrator and PE Router,
page 4-24
• Associating VRFs, page 4-25
• Configuring RADIUS, page 4-26
Configuring Upstream and Downstream VRFs on the L2TP Access Concentrator and PE Router
To configure the upstream and downstream VRFs on the PE router, enter the following commands
beginning in global configuration mode:
Example 4-7 shows how to configure a downstream VRF named D.
Example 4-7 Configuring the Downstream VRF
Router(config)# ip vrf D
Router(config-vrf)# description Downstream VRF - to subscribers
Router(config-vrf)# rd 1:8
Router(config-vrf)# route-target export 1:100
Example 4-8 shows how to configure an upstream VRF named U.
Example 4-8 Configuring the Upstream VRF
Router(config)# ip vrf U
Router(config-vrf)# description Upstream VRF - to hub PE
Router(config-vrf)# rd 1:0
Router(config-vrf)# route-target import 1:0
Command Purpose
Step 1
Router(config)# ip vrf vrf-name
Enters VRF configuration mode and defines the VRF instance by
assigning a VRF name.
Step 2
Router(config-vrf)# rd route-distinguisher
Creates routing and forwarding tables.
Step 3
Router(config-vrf)# route-target {import |
export | both} route-target-ext-community
Creates a list of import and export route target communities for
the specified VRF.
The import keyword is required to create an upstream VRF. The
upstream VRF is used to import the default route from the hub
PE router.
The export keyword is required to create a downstream VRF.
The downstream VRF is used to export the routes of all
subscribers of a given service that the VRF serves.