RIP (Routing Information Protocols)

Basic Notes:

*It’s a Distance Vector Protocol, so it send full routing table to it’s neighbors,
*RIP administrative distance is 120,
*RIP use the UDP 520,
*RIP use the “Bellaman-fard algoritham” to find the best path to destination,
*RIP use the hop count as a Matrics
*RIP max hop count is 15, above of it RIP consider as a unreachable,
*RIP send routing updates every 30sec
*RIP will be make load balancing b/w multiple paths (Max 4 paths),
*RIP default Auto-summary enabled,
*It useful for small office’s,

RIP Versions,

Version1==>It’s a classfull and it’s send the routing updates to broadcast address
Version2==> it’s supports the classless IP address and it’s send the updates to multicast address and also support hash MD5 authentication.

All Cisco Routers default have the RIP version1


Router(Config)#Router rip
Router(Config-Router)#version 1 (for Version1)
Router(Config-Router)#version 2 (For Version2)

Syntax of RIP:

Router(Config)#Router rip
Router(Config-Router)#version 2
Router(Config-Router)#no auto-summary

RIP loop avoid mechanism :

  1. Split-Horizon:- Prevent the routing updates sent through the same interface it received. This mechanism default enabled in Cisco.
  2. Route- Poising:- This mechanism trigger the automatic update of failed network without waiting for the regular update timer expire. this type update sent to all interface with the infinity matrics.
  3. Hold-Down Timers:- It will prevent the RIP from accepting the any updates for router in hold-down state, until the hold-down timer expire.

Basic RIP Config watch here…