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CCNA - Topics









RIP Stand for Routing Information Protocol

Type                 :Distance Vector Routing Protocol
AD Value            :120
Hello Timer         :None
Update Timer      :30 sec
Dead Timer         :180 sec
Transport           :520 (UDP)
Multicast Add      :


RIP (Routing Information Protocol) it is open standard for any vendor use and it is a widely used protocol for managing router information within a network such as a corporate local area network (LAN). RIP is classified by the Internet Engineering Task Force (IETF) as one of several internal gateway protocols (Interior Gateway Protocol).

It uses metric as hop count (max hop count is 15) It sends periodic update for every 30 sec. It is mostly used for small business network.


Difference between Rip V1 & Rip V2

Rip V1

  • It is a Class full Protocol.

  • Classful Protocol: - Supports networks with same Subnet Mask

  • RIPV1 uses Broadcast Address

  • RIPV1 Universal Broadcast (

  •  RIPV1 does not VLSM.

Rip V2

  • It is a Classless Protocol.

  • Classless Protocol: - Supports subnetted networks; It carries the information of   subnet mask

  • RIP V2 uses Multicast Address

  • RIPV2 uses Multicast ( 

  • RIPV2 supports VLSM

RIP – Passive Interface

The passive-interface command prevents a RIP-enabled router from sending broadcast and multicast RIP updates out of a specific interface, a set of interfaces, or all router’s interfaces.

The passive-interface command has the following syntax:

passive-interface [default] {interface type/number}

When this command is used with the default keyword, the router will disable all kinds of RIP updates except unicast RIP updates out of all the interfaces. Unicast RIP updates are configured using the neighbor command in router configuration mode. If the default keyword is not used, then the router will send broadcast or multicast RIP updates (depending on the configured RIP versions) out the interface(s) specified in the passive-interface statement. The following example configures the router R1 to disable RIPv2 updates out of the interfaces f0/0 and f0/1 according to the network diagram below.

R1(config-router)#router rip
R1(config-router)#version 2
R1(config-router)#passive-interface fastethernet 0/0
R1(config-router)#passive-interface fastethernet 0/1

Split horizon

Split horizon is a technique used to avoid RIP routing loops. When split horizon is enabled on a specific interface, the router does not re-advertise RIP routes received on that interface. Now, let’s analyze the following network. We assume that RIP auto summarization is disabled on the network.

R2 and R3 will send routing information about the subnets and, respectively to R1. R1 will receive this information over the interface Serial1/0.1 (frame relay multipoint interface). Because split horizon is enabled on R1′s serial 1/0.1 sub-interface, then R1 will not advertise the subnets and to R3 and R2, respectively. To avoid this, we should disable split horizon on the interface serial 1/0.1. Therefore, R1 will send the subnets and to R3 and R2, respectively.

The ip split-horizon command has no parameters or keywords, and it was introduced in Cisco IOS Software Release 10.0. By default, this command is enabled on all types of interfaces, except on main frame-relay interfaces and SDMS interfaces.

In the following example, we’ll configure R1 in order to enable IP connectivity between R2 and R3 by disabling split horizon on the interface serial1/0.1.

R1(config)#router rip
R1(config-router)#version 2
R1(config-router)#no auto-summary
R1(config)#interface serial 1/0.1
R1(config-subif)# no ip split-horizon

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