Rip Routing Protocol Configuration; Rip Overview - D-Link xStack DGS-3610 Series Configuration Manual

DGS-3610 Series Configuration Guide
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27.1 RIP Overview

The RIP (Routing Information Protocol) is a relatively old routing protocol, which is widely
used in small or homogeneous networks. The RIP uses the distance-vector algorithm, and
so is a distance-vector protocol. The RIP is defined in the RFC 1058 document.
The RIP exchanges the routing information by using the UDP packets, with the UDP port
number to be 520. Usually, the RIPv1 packets are broadcast packets, while the RIPv2
packets are multicast packets, with the multicast addresses to be 224.0.0.9. The RIP sends
update packets at the intervals of 30 seconds. If the router does not receive the route update
packets from the other end within 180 seconds, it will mark all the routes from that router as
unreachable. If the router still does not receive the update packets within 120 seconds, it will
delete such routes from the routing table.
The RIP measures the distance to the destination in hops, know as route metrics. In the RIP,
the router has zero hop to the network to which it is directly connected. The network that is
reachable by one router is one hop away, and so on. The unreachable networks have hops
of 16.
The device that runs the RIP routing protocol can learn the default routes from the neighbors
or generate their own default routes. When any of the following condition is met, the
DGS-3610 series will generate the default route and advertise it to the neighbor router:
IP Default-network is configured.

The default routes or static default routes learnt by the routing protocol are incorporated

into the RIP routing protocols.
The RIP will send the update packets to the port of the specified network. If the network is
not associated with the RIP routing process, the interface will not be notified to any update
packets. The RIP is available in two versions: RIPv1 and RIPv2. The RIPv2 supports
plain-text authentication, MD5 cryptographic text and variable length subnet mask.
To avoid a loop route, the RIP uses the following means:
Split Horizon

Poison Reverse

Holddown time
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RIP Routing Protocol
Configuration
Chapter 27 RIP Routing Protocol Configuration
27-1