Routing Information Protocol version 2
(RIP v2) is defined in RFC 1723 and is supported in IOS versions
11.1 and later. RIP v2 is similar to RIP v1, but is not a new
protocol. RIP v2 features extensions to bring it up-to-date with
modern routing environments. The RIP v2 extensions are listed in
the following:
- Subnet Masks carried with each route entry
- Authentication for routing updates
- Next Hop addressing carried with each route entry
- Route Tags for external use
- Queries in response to RIP v1 requests
The most important extension listed is the
Subnet Mask field for routing-update entries. The Subnet Mask
field enables the use of variable-length subnet masks (VLSMs) and
qualifies RIP v2 as a classless routing protocol.
RIP v2 is the first of the classless routing protocols discussed
in this module. This module serves as an introduction to classless
routing and RIP v2.