Routing: Difference between revisions
→Routing Protocol Classification
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Here we will discuss important questions from routing concepts.
= Routing Concepts =
* In Classful addressing, Routing Table has 3 columns While in Classless addressing, at least 4 Columns are needed:- CIDR Mask, Network Address, Next hop address, Interface.
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Ans) By using Static ARP entry.
* '''Split horizon'''
Method of preventing a routing loop in a network.
Information about the routing for a particular packet is never sent back in the direction from which it was received.
= Routing Protocol Classification =
== Classification based on deployment location ==
Interior Gateway Protocol:
OSPF
RIP
EIGRP
Exterior Gateway Protocol:
EGP
BGP
== Distance Vector ==
*Protocols:
RIP
EIGRP
BGP (Adv Distance Vector or Path Vector)
*Also called Routing by Rumour
*Processor Efficient as they do not have full Topology information
*Best Route calculation might be less accurate
== Link State Routing Protocol ==
*Protocols:
IS-IS
OSPF
*Maintain 3 tables:
#Neighbor Table
#Topology Table
#Routing Table
*Processor Intensive as they have full topology information about each and every network
*Better Route calculation
*EIGRP also have topology table but they contain a list of the best routes calculated by neighbors only.
*Areas should not become too big.
*LS Routing protocols send only triggered updates i.e. to announce network changes only(RIP sends full routing table every 30 seconds).
*Sends Periodic updates - LS Refresh on long intervals (OSPF 30 minutes) to avoid any missed routes.
;References
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