Basic Exterior Routing in .NET

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Another way of looking at constraint-based routing is that it introduces traffic management and other policies into routing protocols that originally were intended only to establish reachability
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Basic Exterior Routing
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Path vector, the basic algorithm of BGP, should be considered part of a reachability protocol rather than a more general routing protocol The sequence of events in exterior routing is as follows: 1 Listen to peers announce potential routes to a destination Apply ingress filters to them, delete those denied by policy, and change attributes as required by acceptance policy Store these in a per-peer or per-peergroup Adj-RIB-In 2 Test the selected routes to see if they are preferable to your existing route, or go to new destinations Subject to additional constraints (for
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MPLS, and associated protocols such as Label Distribution Protocol (LDP), RSVP with Traffic Engineering (RSVP-TE), and Constraint-Based Routing LDP (CR-LDP) are neither topology discovery nor route computation protocols Their role comes later in this discussion Unfortunately, many people in the industry, especially those working for telephone companies or for vendors specializing in the telephone market, assume MPLS is a total replacement for IP, and that the confusing topic called IP routing will somehow go away They are wrong, because MPLS is an overdrive to conventional IP routing The idea of an overdrive, unfortunately, can be misleading Originally MPLS and its predecessors were seen as faster means of forwarding than conventional router lookup Routers (which admittedly may be called layer 3 switches by some marketers) now can have sufficient hardware assistance for route lookup, and fast enough lookup algorithms, that MPLS forwarding is not significantly faster than router forwarding The distinct value of MPLS is its ability to place useful equivalents to circuits between connectionless IP and a variety of transmission media MPLS is sometimes jokingly called ATM without cells, but one of its attractions is the ability to do the sort of traffic engineering and QoS control that is much easier with connection-oriented than connectionless services MPLS also has features that make it useful for VPN creation, especially involving multiple providers Another attraction of the MPLS work is its generalization into Generalized MPLS (GMPLS), which will allow a largely common control plane to control transmission systems that do not understand packets Such systems include optical and multiplexed transmission technologies
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instance, whether you have a valid hop to the new route), replace the selected route or add it to the BGP Loc-RIB 3 For those routes that pass both the requirements of entry into the LocRIB and the main RIB (see next section), store these routes in per-peer or per-peer-group Adj-RIB-Outs and advertise them to peers as specified by advertising policies There may be direct importing and exporting between different route computation processes, or routes may be imported from the RIB
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Take routes determined in route computation and compare the routes learned from different computational sources, some of which may be preferred to others Install the selected routes in the RIB, deriving a FIB from it as appropriate (Figure 223) The basic process is defined in [RFC 1812], but all major vendors have extended it Establishing preferences among various routing information sources, such as route weight in Bay RS or administrative distance in Cisco IOS, is most common Load sharing extensions also are common The RIB, defined as the repository of routes the router is actually using to route, also becomes part of path computation by specific protocols BGP, for example, will not advertise a route that has a next hop that is unreachable according to the RIB
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Source of routing information (may have internal preferences, such as OSPF inter-area vs intra-area)
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