Zte ZXR10 5900E Series Configuration Manual page 17

Chapter 2
RIP Configuration
Table of Contents
RIP Overview .............................................................................................................2-1
Configuring RIP .........................................................................................................2-3
RIP Maintenance........................................................................................................2-8
RIP Configuration Example ......................................................................................2-13
2.1 RIP Overview
Introduction to RIP
RIP is relatively old but still commonly used interior gateway protocol created for use in
small and homogeneous networks. This is a classical distance-vector routing protocol.
RIPv1 is documented in Request For Comments (RFC) 1058. RIPv2 is documented in
RFC1723. ZXR10 5900E supports RIPv1 and RIPv2 completely. RIPv2 is used by default.
Compared to RIPv1, RIPv2 has the following advantages.
l
Route updating with sub network mask
l
Authentication for route updating
l Updating multicast routing
The following topics mainly introduce RIPv2. RIP refers RIPv2 unless special explain.
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RIP Route Metric and Administrative Distance
RIP uses User Datagram Protocol (UDP) packet (port number 520) to exchange RIP
routing information. The routing information containing in RIP packet includes the
number of routers that a route passes through, that is, hop count, according to which,
router determines the route to the destination network.
RFC stipulates that the maximum hop count must be less than 16, so RIP is only
applicable to small-sized network.
representing unreachable route, which is one way for RIP to identify and prevent the
routing loop.
Only hop count is taken as the metric for RIP routing; bandwidth, delay and other
variable factors are not considered. RIP always takes paths with the least hop count
as the optimized path, which results that the selected path is not the best one.
Default Administrative Distance (AD) value of RIP is 120. As for AD, the lower the
value, the higher the reliability of routing source. Compared to other routing protocols,
RIP is not quite reliable.
l
RIP Timers
SJ-20150114102049-003|2015-01-15 (R1.0)
Hop count of 16 indicates infinite distance,
2-1
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