Juniper BGP - CONFIGURATION GUIDE V 11.1.X User Manual

■ There is no no version.
■ See clear ip routes.
Enabling VRF–to–VR Peering
In some circumstances you might want a CE router, which connects to the PE router
by means of a VRF, to be able to establish an EBGP peering session directly with the
parent VR in which the VRF has been configured. The global instance of BGP for the
PE router runs in the parent VR to exchange VPN routes with its peers by means of
internal or external MP-BGP. BGP could also be learning IPv4 unicast Internet routes
from one or more of its core-facing, internal or external BGP peers.
In the context of the VRF, you can use the ip route parent-router command to add
a static host route to a stable interface (typically a loopback interface) in the parent
VR by way of a hidden VRF-internal interface.
host1(config)#virtual-router PE1
host1:PE1(config)#interface loopback 1
host1:PE1(config-if)#ip address 10.20.20.2 255.255.255.255
host1:PE1(config-if)#exit
host1:PE1(config)#virtual-router :PE11
host1:PE1:PE11(config)#ip route parent-router loopback 1
In this example, assume that the global instance of BGP for the PE router runs in the
parent VR, PE 1, to exchange VPN routes with its peers by means of internal or
external MP-BGP. BGP can also be learning IPv4 unicast Internet routes from one or
more of its core-facing, internal or external BGP peers.
By virtue of the static route configured in VRF PE 11, a CE router that connects to
that VRF can establish an EBGP session directly to loopback 1 (10.20.20.2) in the
parent VR, PE 1. The same PE router can therefore provide both VPN and Internet
access to any attached CE routers.
You can display the static route to the parent VR with the show ip route and show
ip static commands, as in the following examples:
host1:PE1:PE11#show ip route
Prefix/Length Type Next Hop Dist/Met Intf
------------------ ------- ----------------- ------------- ---------------
10.20.20.2/32 Static 0.0.0.0[V:PE1] 1/0 vrf-internal3
host1:PE1:PE11#show ip static
Prefix/Length Next Hop Met Dist Tag Intf
10.20.20.2/32 0.0.0.0 0 1 0 vrf-internal3
ip route
■ Use to establish a static route in a VRF to a remote interface in the parent VR.
■ The specified interface must be preexisting and have an alias assigned with the
description command.
■ The route points to a next-hop interface that is internal to the VRF and created
automatically when the VR comes up. This interface is hidden and cannot be
454 ■ Configuring BGP VPN Services
JUNOSe 11.1.x BGP and MPLS Configuration Guide

Juniper BGP - CONFIGURATION GUIDE V 11.1.X Specifications

General

Brand	Juniper
Model	BGP - CONFIGURATION GUIDE V 11.1.X
Category	Software
Language	English