Ripv1; Ripv2; Preventing Routing Loops In Rip - Avaya G250 Administration

The very simplicity of RIP has a disadvantage however. This protocol does not take into account
network bandwidth, physical cost, and data priority. The Avaya G250/G350 Media Gateway
supports two versions of RIP:

RIPv1

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RIPv2

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RIPv1
RIPv1 is the original version of the RIP protocol. The RIPv1 protocol imposes some limitations
on the network design with regard to subnetting. When operating RIPv1, you must not configure
variable length subnetwork masks (VLMS). Each IP network must have a single mask, implying
that all subnetworks in a given IP network are of the same size. Also, when operating RIPv1,
you must not configure supernets. RIPv1 is defined in RFC 1058.
RIPv2
RIPv2 is a newer version of the RIP routing protocol. RIPv2 solves some of the problems
associated with RIPv1. The most important change in RIPv2 is the addition of a subnetwork
mask field which allows RIPv2 to support variable length subnetworks. RIPv2 also includes an
authentication mechanism similar to the one used in OSPF. RIPv2 is defined in RFC 2453.
Table 23: RIPv1 vs. RIPv2
Table 23: RIPv1 vs. RIPv2
RIPv1
Broadcast addressing
Timer-based – updated every 30 seconds
Fixed subnetwork masks
No security
No provision for external protocols

Preventing routing loops in RIP

You can use the following features in RIP to help avoid routing loops:
Split-horizon
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Poison-reverse
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The split-horizon technique prevents information about routes from exiting the router interface
through which the information was received. This prevents small routing loops. Use the
ip rip split-horizon command to enable the split-horizon mechanism. Use the no form
of this command to disable the split-horizon mechanism. By default, split-horizon is enabled.
on page 345 summarizes the differences between RIP and RIP2.
RIPv2
Multicast addressing
Timer-based – updated every 30 seconds
VLSM support – subnet information transmitted
Security (authentication)
Provision for EGP/BGP (Route tag)
Configuring RIP
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