Exterior Gateway Protocol implementation schedule (RFC0890)
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
Status of this Memo
Network Working Group Jon Postel
Request for Comments: 890 ISI
Exterior Gateway Protocol Implementation Schedule
Status of this Memo
This memo is a policy statement on the implementation of the Exterior
Gateway Protocol in the Internet. This is an official policy
statement of ICCB and DARPA.
The Current Situation
Currently the Internet has a number of smart gateways and a number of
dumb gateways. The smart gateways dynamically exchange routing
information among themselves using the Gateway Gateway
Protocol (GGP) . The dumb gateways do not exchange routing
The dumb gateways must be listed in the smart gateway routing tables,
and changes in dumb gateways status (e.g., adding new dumb gateways)
in the smart gateways tables requires human intervention.
The amount of routing traffic between smart gateways depends on the
number of smart gateways and the total number of networks. Since
dumb gateways typically connect a single network at the edge of the
Internet, there is typically one more network in the routing table
for each dumb gateway.
Gateways that connect a single network to the edge of the Internet
may be called "stub" gateways.
The current GGP procedures used by the smart gateways are at the
limits of their capacity. A significant change to these procedures
is urgently required. This is difficult to perform because the smart
gateways are maintained by several different groups, and because it
is difficult to isolate a subset of these gateways for testing new
The Future Situation
In the future, as it is currently envisioned, there will be a number
of co-equal autonomous systems of gateways. Each as will have its
own private internal procedures for maintaining routing information,
perhaps via an Interior Gateway Protocol (IGP). The smartness of a
gateway will be the smartness of the IGP used in the autonomous
system the gateway participates in. Some gateways of each autonomous
system will exchange routing informations with some gateways of other
autonomous systems via an Exterior Gateway Protocol (EGP) .
RFC 890 February 1984
EGP Implementation Schedule
The factoring of the old set of smart gateways into a number of
autonomous systems allows more flexibility for the development and
testing of improved routing procedures. Different autonomous systems
can adopt different routing procedures internally, as long as they
communicate with other autonomous systems via the EGP.
The Transition Situation
The first step in the transition from the current situation to the
future situation is the replacement of all dumb gateways with
gateways that implement at least a subset of the EGP.
This subset is called the "Stub Ex...