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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 125
The distances, measured in router hops are entered in the
Distance to Source Network, and Distance to Destination
Network fields.
RIP 1 Route Interpretation
RIP was designed to be used with classed address schemes,
and does not include an explicit subnet mask. An extension to
version 1 does allow routers to exchange subnetted addresses,
but only if the subnet mask used by the network is the same as
the subnet mask used by the address. This means the RIP
version 1 cannot be used to propagate classless addresses.
Routers running RIP version 1 must send different update
messages for each IP interface to which it is connected.
Interfaces that use the same subnet mask as the router’s
network can contain subnetted routes, other interfaces cannot.
The router will then advertise only a single route to the network.
RIP Version 2 Extensions
RIP version 2 includes an explicit subnet mask entry, so RIP
version 2 can be used to propagate variable length subnet
addresses or CIDR classless addresses. RIP version 2 also
adds an explicit next hop entry, which speeds convergence and
helps prevent the formation of routing loops.
RIP2 Message Format
The message format used with RIP2 is an extension of the RIP1
format: