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Exterior Gateway Protocol implementation schedule (RFC0890) Disclosure Number: IPCOM000003939D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 3 page(s) / 6K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Postel: AUTHOR


Status of this Memo

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 53% of the total text.

Network Working Group Jon Postel

Request for Comments: 890 ISI

February 1984

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) [3]. The dumb gateways do not exchange routing

information dynamically.

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) [2].

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...