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·Area Border Routing
·The first category external routing
·The second category external routing
The description of routing in or between areais for network structurein
Autonomy system. External routingdescribes how to choose destination
routing out of Autonomy system.
The first category external routing is received IGP router (such as: RIP and
STATIC). This kind of router is more credible, so the cost volume of external
router and autonomy system is the same and can compare with the router of
OSPF itself, that is, the cost to external router= the cost to its ASBR +the cost
of ASBR to destination address.
The second category external routing is the received EGP router. This kind of
router is less credible, so the cost volume of ASBR to the outside of autonomy
system is far more expensive than that of autonomy system to ASBR, so the
former is mainly considered, that is, the cost to the second external router =
9-22

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