Configuring Pe-To-Pe Lsps; Enabling Bgp Routing; Enabling Bgp Ecmp For Bgp/Mpls Vpns - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide

Configuring PE-to-PE LSPs

See "Configuring MPLS" on page 267, for information about configuring LSPs.

Enabling BGP Routing

You must enable the BGP routing process on the router serving as the PE router.
router bgp

Enabling BGP ECMP for BGP/MPLS VPNs

Enabling ECMP support for BGP/MPLS VPNs allows multiple VPN routes to be included
in the list of available equal-cost paths. You can use the maximum-paths command
with the ibgp or eibgp keywords to enable ECMP support for BGP/MPLS VPNs.
The eibgp keyword specifies that the E Series router consider both external BGP
(EBGP) and internal BGP (IBGP) paths when determining the number of equal-cost
paths to the same destination that BGP can submit to the IP routing table. The ibgp
keyword specifies that the E Series router consider multiple internal IBGP paths, but
not EBGP paths, when determining the number of equal-cost paths.
You can create an ECMP environment in which multiple IBGP paths are selected as
Example 1
multipaths and used for load balancing. In the example shown in Figure 93 on
page 441, the E Series router gives equal consideration to IBGP VPN routes learned
from multiple remote PE devices when determining load balancing.
440
Configuring BGP VPN Services
Use to enable the BGP routing protocol and to specify the local AS the AS to
which this BGP speaker belongs.
All subsequent BGP configuration commands are placed within the context of
this router and AS; you can have only a single BGP instance per virtual router.
Specify only one BGP AS per virtual router.
Example
host1:vr1(config)#router bgp 100
This command takes effect immediately.
Use the no version to remove the BGP process.
See router bgp.