Routing Protocol	Type	Loop Prevention	Default Metric	VLSM	Max Hops	Broadcast or Multicast Address	Default Hello/Dead or Updates          (Seconds)
RIPv1	Dist.Vect	Hold down timer/Split Horizon Administrative Default = 120	Hops	No	15	Broadcast (255.255.255.255)	Updates every 30 Seconds Hold down timer 180 Sec
R(config)#Router RIP R(config-router)#network <network addr>			Distance Vector so simply allocates metrics for routes. This is based on Hop count. The least hops means the route is selected. Complete Routing table is sent to neighbors.
RIPv2	Dist.Vect	Hold down timer/Split Horizon Administrative Default = 120	Hops	Yes	15	224.0.0.9	Updates every 30 Seconds Hold down timer 180 Sec
R(config)#Router RIP R(config-router)#version 2 R(config-router)#network <addr>			Distance Vector so simply allocates metrics for routes. This is based on Hop count. The least hops means the route is selected. By default, sends v1 and listens for v1 and v2. Complete Routing table is sent to neighbors. To make v2, turn off v1 and force to v2 with the command Router RIP and Version 2 Differences to v1:Authentication, Classless, VLSM, Multicast, Uses Route tags
IGRP (Cisco)	Dist.Vect	Hold down timer/Split Horizon Administrative Default = 100	Bandwidth,delay	No	255	Broadcast (255.255.255.255)	Updates every 90 Seconds Hold down timer 280 Sec
R(config)#Router IGRP <as> R(config-router)#network <addr>			Distance Vector so simply allocates metrics for routes. This is based on delay, bandwidth, load and reliability. By default it uses bandwidth and delay only.
EIGRP     (Cisco)	Hybrid	DUAL algorithm & Feasible Successor Administrative Default = 90	Bandwidth,delay	Yes	224	224.0.0.10	5/15 Sec (>1.544Mbps) 60/180 (Frame Relay. <1.5M)
R(config)#Router EIGRP <as> R(config-router)#network <addr> <wild card>			Packet types:Hello, Acknowledgement, Update, Query, Reply (Hello and Ack not sent reliably) States:Active and Passive. Active during Computation and Passive during normal routing. 3 databases:Neighbor Table, Topology Table, Routing Table. Routes placed in Routing Table by DUAL. It calculates Successors, Feasible Successors. Bounded partial updates Multicast to routers that need to know. Calculates Lowest Cost Routes
OSPF	Link State	Dijkstra SPF algorithm & full topology knowledge Administrative Default = 110	Cost from Bandwidth	Yes	No Limit	224.0.0.5(all) 224.0.0.6(DR/BDR)	10/40 Seconds 30/120 (NBMA)
R(config)#Router OSPF <Process ID> R(config-router)#network <addr> <wild> area <x>			Packet types:Hello, Database Description Packet (DBD), Link State Request, LSU, LSACK States:Down, Init, Twoway,Exstart, Exchange, Loading, Full. (DR/BDR selected at Exstart stage) 3 databases:Adjacency holds Neighbors, Topological (Link State) holds all routers in area, Forwarding database (routing table) generated by the algorithm run on the link state database. Best Paths selected using Dijkstra SPF algorithm to create the routing table (Forwarding database) Event Triggered updates are Multicast in LSU's (which contain LSA) to the DR (for all routers) Chooses DR by highest RouterID, and calculates shortest path first (ie SPF)
			Note:LSA's time out and send new LSU every 30 minutes
IS-IS	Hybrid	Administrative Default = 115
			Cisco White Papers for Routing Protocols
			List of RFC Papers