The vrf-export statement is used to apply a custom-defined routing policy to routes as they are exported from a specific VRF routing table (e.g., customer-A.inet.0) into the primary BGP Layer 3 VPN table (bgp.l3vpn.0) for advertisement to remote PE routers. This policy provides the necessary flexibility to perform advanced actions, such as attaching multiple BGP communities to the VPN routes. The vrf-target statement, by contrast, is a simplified macro that only attaches a single, specified route-target community.

B. vrf-import: This applies a policy to routes being imported into the VRF from remote PEs, not to routes being advertised from the VRF.

C. vrf-target export: This is a simplified configuration statement that automatically attaches only a single route-target community to exported routes.

D. vrf-target import: This statement filters which routes are accepted into the VRF based on their route-target community, it does not affect exported routes.

1. Juniper Networks TechLibrary

Junos OS VPNs Library for Routing Devices

"Configuring Routing Policies for VRF Tables in Layer 3 VPNs": This document explicitly states

"To apply an export policy to the VRF table

you include the vrf-export statement... The export policy is applied to routes being exported from the VRF routing table and advertised to other PE routers." It contrasts this with vrf-target

which is a simplified policy.

2. Juniper Networks TechLibrary

Junos OS VPNs Library for Routing Devices

"vrf-export": The documentation for the vrf-export statement specifies its function: "Apply an export routing policy to routes being exported from a VRF routing table into the local PE router’s primary routing table." A policy is the mechanism used to attach multiple communities.

3. Juniper Networks TechLibrary

Junos OS VPNs Library for Routing Devices

"Understanding the vrf-target Community": This guide explains

"The vrf-target statement is a simplified way of configuring a VPN policy... When you configure a vrf-target statement

a BGP extended community is created." It clarifies this is a simplified method for a single community

whereas vrf-export and vrf-import are used for more complex policies.