Enabling Vrf-To-Vr Peering - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide
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.
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
------------------ ------- -----------------
10.20.20.2/32
host1:PE1:PE11#show ip static
Prefix/Length
10.20.20.2/32
ip route
454
Configuring BGP VPN Services
There is no no version.
See clear ip routes.
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
Type
Static 0.0.0.0[V:PE1]
Next Hop
0.0.0.0
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
Next Hop Dist/Met
------------- ---------------
1/0
Met Dist Tag Intf
0 1 0 vrf-internal3
Intf
vrf-internal3