Routing/Routed Protocols. Part 2. Remember:. A Routed Protocol – defines logical addressing. Most notable example on the test – IP A Routing Protocol – fills the routing table with routing information. Examples on the test – RIP, IGRP, EIGRP, OSPF, IS-IS. Main Goals of Routing Protocols.
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1) The holddown timer expires
2) Another update is received with a better metric
3) A flush time, which is the time a route would be held before being removed, removes the route from the routing table when the timer expires.
4) Each router runs the SPF algorithm against its own topology database to calculate the best routes to each subnet in the database.
5) Each router places the best route to each subnet in the IP routing table.
Discovers neighbors via “Hello” packets
Builds topology table
After learning its neighbor’s routes, only changes to the routing table are propagated.
Uses autonomous system number (like IGRP)
Uses metric based on bandwidth & delay
Advertises entire routing table to new neighbors.EIGRP Feature Comparison