ELSA Cable manual Dynamic routing with IP/RIP, What information is propagated by IP/RIP?

34Operating modes and functions

IP address	IP netmask	Router name	Dist.	This is what happens:
192.168.0.0	255.255.0.0	0.0.0.0	0	Excludes transmission of all data
172.16.0.0	255.255.0.0	0.0.0.0	0	packets to networks using private
				address spaces.
10.0.0.0	255.0.0.0	0.0.0.0	0
224.0.0.0	224.0.0.0	0.0.0.0	0
255.255.255.255	0.0.0.0	CABLE	1	All data packets which cannot be
				allocated to the entries listed
				above are transmitted into the
				cable network.

Dynamic routing with IP/RIP

In addition to the static routing table ELSA routers also have a dynamic routing table containing up to 128 entries. Unlike the static table, you do not fill this out yourself, but leave it to be dealt with by the router itself. It uses the Routing Information Protocol (RIP) for this purpose. This protocol is used by all devices with RIP to exchange information regarding the reachable routes.

What information is propagated by IP/RIP?

A router uses the IP/RIP information to inform the other routers in the network of the routes it finds in its own static table. The following entries are ignored in this process:

KRejected routes with the '0.0.0.0' router setting.

KRoutes referring to on other routers in the local network.

Which information does the router take from received IP/RIP packets?

When the router receives such IP/RIP packets, it incorporates them in its dynamic routing table, which looks something like this:

IP address	IP netmask	Time	Distance	Router
192.168.120.0	255.255.255.0	1	2	192.168.110.1
192.168.130.0	255.255.255.0	5	3	192.168.110.2
192.168.140.0	255.255.255.0	1	5	192.168.110.3

What do the entries mean?

IP addresses and network masks identify the destination network, the distance indicates the number of routers between sender and receiver, the final column indicates the router which announced this route. This leaves the 'Time'. The dynamic table thus shows how old the relevant route is. The value in this column acts as a multiplier for the intervals at which the RIP packets arrive. A '1', therefore, stands for 30 seconds, a '5' for about 2.5 minutes and so on. New information arriving about a route is, of course, designated as directly reachable and is given the time setting '1'. The value in this column is

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