Ns2.35 self-contained satellite network centralized routing Learning

In ns2.35, satroute. CC ,~. H implements centralized Routing

@@In. H files, there are mainly the following types:

1. satrouteagent

ClassSatrouteagent: Public agent

Inheritance relationship:

Satrouteagent <-Agent <-connector <-nsobject <-tclobject, Handler

2. satrouteobject

ClassSatrouteobject: Public routelogic

Inheritance relationship:

Satrouteobject <-routelogic <-tclobject

 

@@In. CC files, there are mainly the following classes:

static class SatRouteClass:public TclClass{  public:SatRouteClass ():TclClass ("Agent/SatRoute") { }TclObject *create (int, const char *const *) {    return (new SatRouteAgent ());}} class_satroute;static class SatRouteObjectClass:public TclClass{  public:        SatRouteObjectClass ():TclClass ("SatRouteObject") { }        TclObject *create (int, const char *const *) {                return (new SatRouteObject ());        }} class_satrouteobject;

 

The above two classes are mainly used to realize the interaction between C ++ and TCL, which is a general definition.

In the. CC file, we mainly implement the methods of the two classes defined in. h.

 

@ Satrouteobject implements a routing algorithm, including computing network topology, computing routing, and route table distribution.

Computing network topology: void satrouteobject: compute_topology ()

Computing route: void satrouteobject: node_compute_routes (intnode)

Voidsatrouteobject: recompute ()

Distribution Route: voidsatrouteobject: populate_routing_tables (INT node)

There are two computing routes. The first is to calculate the route of a node, the second is to calculate the route of the entire network, and the second is to call the basic routelogic method.

Computing routing is said to be a centralized shortest path algorithm. Is it Dijkstra?

@@Route table Organization

In route. H,Neighbor Link Cost Table, route table

struct adj_entry {double cost;void* entry;};struct route_entry {public:int next_hop;void* entry;};

Defined in satroute. hForwarding Table

// Entry in theforwarding tablestruct slot_entry {       int next_hop;             NsObject* entry;};

What is the difference between a route table and a forwarding table?