Building The Unicast Routing Table
A major function of the control plane is deciding which routes go into the main routing table. "Main" refers to the table that holds the unicast routes that are active. Multicast routing may require an additional routing table for multicast routes. Several routing protocols e.g. OSPF and BGP maintain internal databases of candidate routes which are promoted when a route fails or when a routing policy is changed.
Several different information sources may provide information about a route to a given destination, but the router must select the "best" route to install into the routing table. In some cases, there may be multiple routes of equal "quality", and the router may install all of them and load-share across them.
Read more about this topic: Routing Control Plane
Famous quotes containing the words building and/or table:
“The artist must be an egotist because, like the spider, he draws all his building material from his own breast. But just the same the artist alone among men knows what true humility means. His reach forever exceeds his grasp. He can never be satisfied with his work. He knows when he has done well, but he knows he has never attained his dream. He knows he never can.”
—Rheta Childe Dorr (1866–1948)
“In New York, pretending to be above the struggle means no seat on the bus and a table next to the kitchen.”
—Mason Cooley (b. 1927)