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DES-7200 Configuration Guide Chapter 2 RIP
Configuration
2-1
2 RIP Configuration
2.1 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 RIPv1 is
defined in RFC 1058 and the RIPv2 is defined in RFC 2453.
The RIP exchanges the routing information by using the UDP packets, with the
UDP port number to be 520. Usually, RIPv1 packets are broadcast packets, while
RIPv2 packets are multicast packets with the multicast address of 224.0.0.9. The
RIP sends the update packet at the interval of 30 seconds. If the device has not
received the route update packets from the peer within 180 seconds, it will mark
all the routes from that device unreachable. After that, the device will delete these
routes from its routing table if it still has not received any update packets from the
peer within 120s.
The RIP measures the distance to the destination in hop, known as route metric.
As specified in the RIP, Zero hop exists when the router directly connects to the
network. One hop exists when the router connects to the network through one
device and so on. Up to 16 hops are supported in a network.
The RIP-enabled device can learn the default routes from the neighbors or
generate its own default route. When any of the following condition is met,
DES-7200 product will generate the default route and advertise it to its neighbors
by using the default-information originate command:
IP Default-network is configured.
The default routes or static default routes learnt by the routing protocol are
imported into the RIP protocol.
The RIP-enabled device will send the update packets to the interface of the
network it connects. If the network is not associated with the RIP routing process,
the interface will not advertise 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.
DES-7200 RIP offers Split Horizon to avoid a loop.