Ospf And Bgp/Mpls Vpns; Distributing Ospf Routes From Ce Router To Pe Router - Juniper JUNOSE 11.2.X BGP AND MPLS Configuration Manual

neighbor send-label

OSPF and BGP/MPLS VPNs

Distributing OSPF Routes from CE Router to PE Router

Copyright © 2010, Juniper Networks, Inc.
Configure the P router with an IPv4 IGP and an MPLS signaling protocol.
7.
Configure the PE 2 router as you did PE 1 in Steps 1–6.
8.
Configure the CE 1 and CE 2 routers.
9.
a. Configure both an IPv4 and an IPv6 interface toward the PE router. Use an
IPv4-compatible IPv6 address.
b. Configure an MP-BGP session to the PE router over TCPv4, and activate the
IPv6 unicast address family.
Use to cause an MP-BGP neighbor to distribute an MPLS label with its IPv6 prefix
advertisements.
If you specify a BGP peer group by using the peer-group-name argument, all the
members of the peer group inherit the characteristic configured with this command.
You cannot override the characteristic for a specific member of the peer group.
Example
host1(config-router-af)#neighbor 192.168.5.1 send-label
Use the no version to halt distribution of the MPLS label with route advertisements.
See neighbor send-label.
Before reading this section, we recommend you be thoroughly familiar with OSPF. For
detailed information about that protocol, see JunosE IP, IPv6, and IGP Configuration Guide.
You can use BGP/MPLS VPNs to connect OSPF domains without creating OSPF
adjacencies between the domains. The BGP/MPLS VPN backbone acts as either an
OSPF backbone (area 0) or an OSPF area above the backbone.
In this topology, OSPF is the routing protocol between the CE router and the PE router.
This OSPF link can be configured in area 0 or any other OSPF area. However, if the
customer site has any connections to area 0, then at least one OSPF router configured
on a CE router must have an area 0 link to a PE site. In this case, the BGP/MPLS VPN acts
as if it is in an area above the OSPF backbone area. When the PE-CE link is in a
nonbackbone area, the BGP/MPLS VPN acts as an OSPF backbone.
In either case, the OSPF router configured as a PE router in the BGP/MPLS VPN is always
treated as an area border router (ABR) and functions as an area 0 router so that it can
distribute interarea routes to the CE router. The BGP/MPLS VPN distributes both interarea
and intra-area routes between PE routers as interarea, type 3 summary routes.
You configure OSPF in the VRF associated with the VPN and associate the interface
connected to the CE router with the VRF. OSPF routes can then propagate from a CE
router to a PE router when an OSPF adjacency has formed between the two routers.
Chapter 6: Configuring BGP-MPLS Applications
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