routes for each interface are installed in the forwarding table that is associated with
the VRF routing instance. This routing instance type is used to implement BGP or MPLS
VPNs in service provider networks or in big enterprise topologies.
Consider a sample VRF configuration scenario in which you want to configure two virtual
routers, one to transmit voice and data traffic and another to carry management traffic.
With such a configuration, the user and management networks are virtually separated,
although the physical infrastructure is unified and cohesive. Virtual router routing instances
enable you to isolate traffic without using multiple devices to segment your networks.
The virtual routers do not create IP, MPLS, or GRE tunnels, and automatic discovery of
remote sites that belong to the same network is not available. You must configure
interfaces that are part of a virtual network in a streamlined manner to suit your topology
requirements.
The following limitations apply to VRF routing instances that you configure on ACX Series
routers:
•
You cannot establish a communication between two virtual routing instances that are
connected by external loopback.
•
You cannot add a GRE or an MPLS tunnel to a virtual router.
In the Layer 3 lookup, up to 128 VRF tables are supported. Virtual routers without routing
protocols enabled (based on static routes) support 64 VRF tables and virtual routers
with all functions enabled within the routing instances support 16 VRF tables. When you
enable VRF table labels and you do not explicitly apply a classifier configuration to the
routing instance, the default MPLS EXP classifier is applied to the routing instance. You
can override the default MPLS EXP classifier and apply a custom classifier to the routing
instance. To perform this operation, you can filter the packets based on the IP header,
choose the VRF, and based on the selected VRF, create an EXP classifier and associate
it with the routing instance.
Related
Documentation
Routing Instances Overview•
• Configuring Virtual-Router Routing Instances in VPNs
• Applying MPLS EXP Classifiers to Routing Instances
• Configuring Routing Instances on PE Routers in VPNs
Configuring Layer 3 VPNs to Carry IPv6 Traffic
You can configure IP version 6 (IPv6) between the PE and CE routers of a Layer 3 VPN.
The PE router must have the PE router to PE router BGP session configured with the
family inet6-vpn statement. The CE router must be capable of receiving IPv6 traffic. You
can configure BGP or static routes between the PE and CE routers.
Copyright © 2017, Juniper Networks, Inc.844
ACX Series Universal Access Router Configuration Guide
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