Difference between Distance Vector and Link state routing protocol
Difference between Distance vector & Link State protocol
Distance Vector Protocol :
• Entire routing table is sent as an update
• Distance vector protocol send periodic update at every 30 or 90 second
• Update are broadcasted
• Updates are sent to directly connected neighbor only
• Routers don't have end to end visibility of entire network.
• Distance vector routing protocol network may have patch in network carrying wrong information
• It is proned to routing loops
• Routing loop avoidance Mechanism used are as below :
1> Max Hop Count
2> Spliti horizon
3> Route poisoning
4> Hold down Timer
• Distance vector routing protocol has slow convergance due to periodic update.
• Eg. RIP ,IGRP , BGP .
Link state protocol :
• Updates are incremental & enitire routing table is not sent as update
• Updates are triggered not periodic
• Updates are multicasted
• Update are sent to entire network & to just directly connected neighbor
• Updates are carry SPF tree information & SPF cost Calculation information of entire topology
• Routers have visibility of entire network of that area only.
• No routing loops
• Convergance is fast because of triggered updates.
• Eg. : OSPF , IS-IS