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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:
9033691-01
VH-2402-L3 Management Guide 177
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