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Answered 2012-03-28 20:36:01

OSPF is a classless link-state routing protocol.

RIP version 1 and IGRP are both classful distance vector routing protocols, EIGRP is a hybrid protocol that supports classless addressing.

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Rip V1 is Classful routing protocol Rip V2 is Classless routing Protocol


A classless routing protocol can route between subnets


A routing protocol is a formula that specifies how routers are communicating to each others. Types of routing protocols include Interior Gateway Protocol, Distance vector protocol and Classful or classless protocol. Routing protocols are required to determine the appropriate paths for data transmission.


Classful vs. Classless RIPv1 is a classful protocol, meaning that the subnet mask is not included in the routing updates. With RIP, only the default subnet mask is used to identify networks. RIP v2 is a classless protocol, meaning that the subnet mask IS included in the routing tables.. RIPv2 supports variable subnet masks (VLSM).


Classful routing protocols do not carry subnet mask information on their routing updates. This makes them unsuitable for hierarchical addressing that require Variable Length Subnet Mask (VLSM) and discontiguous network. Classless routing protocols do carry subnet mask information on their routing updates.RIP v1 and IGRP are classful routing protocols. RIP v2, EIGRP, OSPF, and BGP are classless routing protocol.When running a classful routing protocol on a network, make sure you use the same subnet mask everywhere. Otherwise, routing black holes can occur.Classless routing protocols extend the standard Class A, B, or C IP addressing scheme by using a subnet mask or mask length to indicate how routers must interpret an IP network ID. Classless routing protocols include the subnet mask along with the IP address when advertising routing information. Subnet masks representing the network ID are not restricted to those defined by the address classes, but can contain a variable number of high-order bits. Such subnet mask flexibility enables you to group several networks as a single entry in a routing table, significantly reducing routing overhead. Classless routing protocols includes RIP v2 and OSPF, Border Gateway Protocol version 4 (BGP4) and Intermediate System to Intermediate System (IS-IS).



CLASSFUL ROUTING PROTOCOL. It means it will not carry the routing mask information while routing updates or routing advertisements. it will carry just only the ip-address information's. It will assume just default mask information's. Example : class-A 255.0.0.0 Class-B 255.255.0.0 Class-C 255.255.255.0 So classful routing protocols will not support the VLSM and Supernetting Example of classful routing protocols is 1. RIP V1 2. IGRP CLASSLESS ROUTING PROTOCOL These kind of routing protocols will carry the subnet mask information's while doing the routing updates or routing advertisements. So it will support the VLSM and Supernetting, also support noncontiguous networks Example RIP V2 EIGRP OSPF CLASSFUL ROUTING PROTOCOL. It means it will not carry the routing mask information while routing updates or routing advertisements. it will carry just only the ip-address information's. It will assume just default mask information's. Example : class-A 255.0.0.0 Class-B 255.255.0.0 Class-C 255.255.255.0 So classful routing protocols will not support the VLSM and Supernetting Example of classful routing protocols is 1. RIP V1 2. IGRP CLASSLESS ROUTING PROTOCOL These kind of routing protocols will carry the subnet mask information's while doing the routing updates or routing advertisements. So it will support the VLSM and Supernetting, also support noncontiguous networks Example RIP V2 EIGRP OSPF


Classless protocols send a subnet mask with each route advertisement


Classless routing doesn't pay attention to the mask of the address, therefore is able to see more addresses.


A router running a classless routing protocol (Such as OSPF) will send the subnet mask in its route updates to its neighboring routers.


Selecting a routing protocol. Assigning IP network numbers. Assigning network addressess to interfaces.


selecting a routing protocol assigning IP network numbers Assigning network addresses to interfaces


1. EIGRP is a distance vector routing protocol.2. EIGRP supports classless routing and VLSM.



RIPv2 sends subnetmasks in the routing table updates. RIPv1 does not, which causes it be class-full.


if a protocol is only classfull(RIPv1, IGRP) the command will have no effect, but in protocols that support vlsm and classless ip adressing it will enable the protocol to send the subnet mask in it's packets so that a router would not recognize only class networks, but also their subnets.


Particulars RIP V1 RIP V2 VLSM Support NO Route Propogation Mechanism Broadcast (255.255.255.255 ) Multicast (224.0.0.9) Authentication Mechanism No Yes ( Text & MD5 )----RIP V1-----> Classful routing protocol.RIP V2-----> Classless routing protocol.-----------------------------------------------------RIP V1------> Subnet masks are NOT included in the routing update.RIP V2------> Subnet masks are included in the routing update.-----------------------------------------------------RIP V2 is actually an enhancement of RIP V1's features and extensions raether than an entirely new protocol.


routing updates do not include subnet mask


More commonly referred to as classless routing behaviour in reference to protocols. examples are ripv2, eigrp, ospf, isis etc. classless routing protocols submit subnet information in the data they send to other routers. therefore, variable subnet masks can be applied other than the default classful subnet mask. i.e, if the first two bits in the first octet are 0 then it is a class A address, and the first octet only, /8 or 255.0.0.0, is the network portion. hence why the private routing address 10.0.0.0 extends all the way to 10.255.255.255. with classless routing behaviour this can be any subnet mask.


RIP V1 dose not support CIDR or VLSM as it a clasfull routing protocol that dose not include the subnet mask.. however if you were to use RIPV2 you could use static routing with it as it is a classless protocol and dose incoperate the subset mask in the update


Using only classful netmasks on all networks


RIP VERSIONV1 can be seen to exclude subnet information from routing updates, this is because ripv1 is a classful routing protocol and does not support VSLM, this was corrected in RIPv2 where ripv2 does send out subnet mask's in the form of a prefix eg /24 which is the subnet mask of 255.255.255.0 or a class c address.


rip version 1 is classfull routing protocol. in classfull routing protocol is not able to carry its subnet mask whatever the ip belong from a class. it wil take its by default subnet mask.if the ip address belong to class b and the subnet mask is published as /28. in classless routing protocol this ip address would be displayed as /16 not like /28


Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and routing Internet Protocol packets, Or (CIDR) The Center for Inherited Disease Research, that was founded in 1997.


The network and mask combination that requires the use of a classless addressing solution is 172.16.0.0/12. Classless routing is supernetting and is known as CIDR, Classless Inter-Domain Routing.



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