User`s guide

PassFinder AP2520 VoIP Router/Gateway Operation Manual Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd. -
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130.2.0.0 255.255.0.0 131.20.1.1 1 serial0 0 STATIC
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4.6.2. RIP Configuration
Routing Information Protocol (RIP) is one of representative Interior Gateway
Protocol (IGP.) Although RIP was introduced long time ago, RIP is still widely
used. RIP is usually used in a small scale and homogeneous network (using a
single mask.) RIP is one of most representative protocol that uses
Distance-Vector, and RFC 1058 describes RIP standards.
RIP uses User Datagram Protocol (UDP) as the packet to exchange routing
information, and the PassFinder AP2520 router updates routing information
every 30 seconds. This process is called the advertising process. If the router
does not receive updated packets from another router more than for 180
seconds, the router considers that the other router is not available any more.
If the router does not receive any updated information for more than 240
seconds, the router permanently deletes the other router from the routing
table.
For the metric, RIP uses the hop-count. The metric is a value that shows the
difference between two paths where there are several paths from the router to
the destination. The hop-count is number of routers that the route encounters
to reach the destination. Therefore, the metric of the directly connected
network is “0,” and the maximum value of the metric that RIP can have is 15.
(If the metric is 16, the network is considered unreachable.) Due to these
characteristics, it is not recommended to use RIP in a large network.
RIP sends updated information only through the interface that the manager
designated. If no RIP is set in an interface, no RIP updated information can be
sent through this interface. Therefore, to use RIP, the user shall make RIP
related configuration in the corresponding interface.
The biggest difference between RIP version 2 and RIP version 1 is that RIP
version 2 supports Variable Length Subnet Mask (VLSM) and can be used in a
heterogeneous network. Besides, RIP version 2 uses the multicast for routing
Information