Information About Implementing Rip - Cisco NCS 6000 Series Configuration Manual

Information About Implementing RIP

Information About Implementing RIP
RIP Functional Overview
RIP Version 1 (RIP v1) is a classful, distance-vector protocol that is considered the easiest routing protocol
to implement. Unlike OSPF, RIP broadcasts User Datagram Protocol (UDP) data packets to exchange routing
information in internetworks that are flat rather than hierarchical. Network complexity and network management
time is reduced. However, as a classful routing protocol, RIP v1 allows only contiguous blocks of hosts,
subnets or networks to be represented by a single route, severely limiting its usefulness.
RIP v2 allows more information carried in RIP update packets, such as support for:
• Route summarization
• Classless interdomain routing (CIDR)
• Variable-length subnet masks (VLSMs)
• Autonomous systems and the use of redistribution
The metric that RIP uses to rate the value of different routes is hop count. The hop count is the number of
routers that can be traversed in a route. A directly connected network has a metric of zero; an unreachable
network has a metric of 16. This small range of metrics makes RIP an unsuitable routing protocol for large
networks.
Routing information updates are advertised every 30 seconds by default, and new updates discovered from
neighbor routers are stored in a routing table.
Only RIP Version 2 (RIP v2), as specified in RFC 2453, is supported on Cisco IOS XR software and, by
default, the software only sends and receives RIP v2 packets. However, you can configure the software to
send, or receive, or both, only Version 1 packets or only Version 2 packets or both version type packets per
interface.
Here are some good reasons to use RIP:
• Compatible with diverse network devices
• Best for small networks, because there is very little overhead, in terms of bandwidth used, configuration,
• Support for legacy host systems
Because of RIP's ease of use, it is implemented in networks worldwide.
Note VRF does not allow configuration of a group applied directly under router RIP. A group can be configured
if it is applied globally or under VRF.
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
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and management time
Implementing RIP