Routing Protocols Flashcards
IGP
Interior Gateway Protocols - Operate within an autonomous system
EGP
Operate Between Autonomous Systems
3 Types of IGP
RIP
OSPF
EIGRP
1 Type of EGP
BGP
3 Types of Routing Methods
Distance Vector
Link State
Hybrid
Distance Vector
Sends full copy of routing table to its directly connected neighbors at regular intervals. It has slow convergence time and uses hop count as metric
Convergence
Time it takes for all routers to update their routing tables in response to a topology change
Hold Down timer
Prevents updates for a specific period of time and speeds up convergence
Link State
Requires all routers to know about the paths that all other routers can reach in the network
How OSPF or IS-IS work
Information is flooded throughout the domain to ensure routers have synchronized information
RIP
Routing information protocol - IGP it is also a distance vector protocol that uses hop count. Maximum hops is 15.
OSPF
Open Shortest Path First - IGP that is also a link state protocol that uses cost. Cost is based on link speed not hop count
IS-IS
Intermediate system to intermediate system - IGP It is also a link state protocol that uses cost. Functions like OSPF protocol but not as popular or widely used
EIGRP
Enhance interior Gateway Routing Protocol - IGP. It is an advanced distance vector protocol that uses bandwidth and delay, making it a hybrid of distance vector and link State. Cisco Only.
BGP
Border Gateway Protocol - EGP. It is also a path vector that uses the number of autonomous system hops instead of router hops
