Mpls traffic engineering in ospf networksa combined approach. Configuring ospf passive traffic engineering mode, advertising labelswitched paths into ospfv2, example. The book focuses on ospf open shortest path first, a common tcpip routing protocol that provides robust and efficient routing support in the most demanding internet environments. Ospf interarea logic demysrified with rfc 1583 and 2328 with. When traffic engineering is enabled on the routing device, you can enable ospf traffic engineering support. Excerpted from the cisco press book, qos for ipmpls networks, chapter 2. Abstractopen shortest path first ospf is the most commonly used intradomain internet routing protocol. Mplste software enables an mpls backbone to replicate and expand upon the traffic engineering capabilities of layer 2 atm and frame relay networks. Cspf and interarea ospf jnet community juniper forums. Traffic flow is routed along shortest paths, splitting flow at nodes where several outgoing links are on shortest paths to the destination. Mpls configuration guide for cisco asr 9000 series routers. Ospf is an interior gateway protocol igp developed by the ospf working group of the internet engineering task force ietf.
It involves the configuration of a single tunnel at the headend, as opposed to stitching tunnels across each area that must be transversed. The linkstate advertisement lsa is a basic communication means of the ospf routing. An offline hybrid igpmpls traffic engineering approach under lsp constraints. Interarea mpls traffic engineering is available see also detailed.
Raffic flow is routed along shortest paths, splitting flow at nodes where several outgoing links are on shortest paths to the destination. Traffic engineering the service provider network searchnetworking. Internet traffic engineering by optimizing ospf weights abstract. Traffic engineering and its role in service provider networks transitioning from layer 2 to. Traffic engineering te extensions to ospf version 2. Interarea traffic engineering with dynamic abr discovery. Ospf supports the classless interdomain routing cidr addressing model. For mpls traffic engineering, opaque lsa type 10 is only used. In practice, most of the existing ospf or isis networks will have a. The set of mpls traffic engineering components, defined in rsvpte, ospfte, and isiste, which.
With ospf, if an area is connected to the backbone through a virtual link, there may be more than two abrs in the path. Basic operation of mpls te multiprotocol label switching traffic. Fortunately, interarea te and interautonomous system te use. Mpls te can play an important role in the implementation of network services. For example, ospfte has traffic engineering extensions to be used by. Specifies the traffic engineering router identifier for the node and the ip address associated with a given interface. Type 3 summary lsa an area border router abr takes information it has. Open shortest path first ospf is a routing protocol for internet protocol ip networks. When you enable traffic engineering for ospf, the shortestpathfirst spf algorithm takes into account the various labelswitched paths lsps configured under mpls and configures ospf to generate opaque linkstate advertisements lsas that carry traffic engineering parameters. Rfc 4105 requirements for interarea mpls traffic engineering. A methodical and detailed description of the protocol is offered and ospfs role within the wider context of a tcpip network is demonstrated.
Mpls is an integration of layer 2 and layer 3 technologies. Configuring the traffic engineering metric for a specific ospf interface, ospf passive traffic engineering mode, example. Enabling ospf traffic engineering support, example. The weights of links, and thereby the shortest patb routes, can be changed by the network operator. Open shortest path first ospf is the most commonly used intradomain internet routing protocol. Ospf was designed expressly for ip networks and it supports ip subnetting and tagging of externally derived routing information. Consider the following inter area and intra area use cases for configuring srte. Ospf interarea logic demysrified with rfc 1583 and 2328 with routing. In this work we propose a novel hybrid igpmpls traffic engineering. Advertising labelswitched paths into ospfv2, static adjacency.
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