Routing Information Protocol
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
RIP OVERVIEW
RIP is a Distance Vector or Bellman-Ford routing protocol. It is one of the oldest
and widely used interior gateway protocols. Version 1 of RIP is documented in
RFC 1058. RIP version 1 has certain well-known limitations, such as classful
routing. RIP version 2 attempted to fix some of the problems with RIP version 1. In
particular, RIP version 2 supports CIDR and has also added support for
authentication.
RIP uses User Datagram Protocol (UDP) data packets to exchange routing
information. The routing information updates are sent at regular time intervals (by
default, 30 seconds in Alcatel-Lucent’s implementation). If the router does not
receive any updates from a neighboring router for a time interval known as the
invalid timer, it marks all routes from the neighboring router as invalid. And if there
is still no sign of life from the neighboring router after the router’s flush timer has
expired, all the routes are removed.
RIP uses hop count as metric and the max metric is 15. A metric of 16 means the
network is unreachable, a metric of 0 means the network is directly connected.
A default route can be received from another RIP router or it can source the
default route itself. In both the cases, the default route is advertised to other RIP
routers via RIP. A default route can be sourced either with the default-information
originate command or from another routing protocol via redistribution.
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