Routing: Difference between revisions
→Routing Protocol Classification
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[[Category:
Here we will discuss important questions
= 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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* The longest prefix match always wins among the routes actually installed in the routing table, while the routing protocol with the lowest administrative distance always wins when installing routes into the routing table:
[[File:Routing_Decision.jpeg
* The main considerations while building the routing table are:
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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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