Configuring Traffic Engineering for LSPs

When you configure an LSP, a host route (a 32-bit mask) is installed in the ingress router toward the egress router; the address of the host route is the destination address of the LSP. Typically, you configure the BGP option (traffic-engineering bgp), allowing only BGP to use LSPs in its route calculations . The other traffic-engineering statement options, allow you to alter this behavior in the master instance. This functionality is not available for specific routing instances. Also, you can enable only one of the traffic-engineering statement options (bgp, bgp-igp, bgp-igp-both-ribs, or mpls-forwarding) at a time.

Note: Enabling or disabling any of the traffic-engineering statement options causes all the MPLS routes to be removed and then reinserted into the routing tables.

You can configure Open Shortest Path First (OSPF) and traffic engineering to advertise the LSP metric in summary link-state advertisements (LSAs) as described in the section Advertising the LSP Metric in Summary LSAs.

The following sections describe how to configure traffic engineering for LSPs:

• Using RSVP and LDP Routes for Traffic Forwarding
• Using RSVP and LDP Routes for Forwarding in VPNs
• Using RSVP and LDP Routes for Forwarding But Not Route Selection
• Advertising the LSP Metric in Summary LSAs

Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice.