password (the null password is exchanged by default).
are exchanged.
to be a stub.
family who just moved in next door. OSPF says "Hello!" OSPF sends its hello packets to the
multicast address All SPF Routers. OSPF is a friendly protocol, and the first thing it wants to
do is form an adjacency. As soon as the adjacency is established, OSPF shares all its information
with its new neighbor. OSPF shares routing information and keeps a synchronized database
with all its neighbors.
database and multicasts the change to its adjacent neighbor, which in turn propagates the
change to its adjacent neighbor until all routers within an area have synchronized topological
databases. This results in quick convergence among routers. OSPF routes can also be
summarized in LSAs.
excessive traffic created by the link updates would be unacceptable. So OSPF elects designated
routers (DR) and backup designated routers (BDR) to form the adjacencies.
attached and supports the capability to address a single physical message to all the attached
routers. The designated router can send LSAs to the rest of the routers on the network. The
designated router is the router with the highest priority. The backup designated router is ready
to step up in the event that the designated router becomes unavailable. To appoint a router to the
office of designated router, be sure it has the highest priority (255). The routers with the two
highest priorities are elected DR and BDR.