Routing Technologies-OSPF overview
OSPF (Open Shortest Path First) is a connection state routing protocol. Since it is an open standard, it is executed by an assortment of system merchants. OSPF will keep running on most routers that don’t really need to be Cisco routers (not at all like EIGRP which can be run just on Cisco routers).
Here are the most imperative highlights of OSPF:
- a classless routing protocol
- underpins
VLSM,CIDR, manual route synopsis, level with cost stack adjusting - incremental updates are upheld
- utilizes just a single parameter as the metric – the interface cost.
- the administrative distance of
OSPFcourses is, as a matter of course, 110. - utilizes multicast addresses
224.0.0.5and224.0.0.6for routing updates.
Routers running OSPF need to build up neighbor connections before trading routes. Since OSPF is a connection state routing protocol, neighbors don’t trade steering tables. Rather, they trade data about network topology. Each OSFP router at that point runs SFP calculation to ascertain the best routes and adds those to the routing table. Since every switch knows the whole topology of a router, the shot for a routing circle to happen is negligible.