Technical data

Table 5–1: GATED Protocols and RFCs
Protocol Description
DescribedinthisRFC
Routing Information
Protocol (RIP) supports
both Versions 1 and 2
RIP is a commonly used
interior protocol that selects
the route with the lowest
metric (hop count) as the best
route.
RFCs 1058, 1723
Open Shortest Path First
(OSPF) Version 2
Another interior routing
protocol, OSPF is a link state
protocol (shortest path first).
It is better suited than RIP
for use in complex networks
with many routers.
RFC 1583
Exterior Gateway Protocol
(EGP)
EGP exchanges reachability
information between
autonomous systems.
An autonomous system
is usually defined as a set
of routers under a single
administration, using an
interior gateway protocol
and common metric to
route packets. Autonomous
systems use exterior routing
protocols to route packets to
other autonomous systems.
RFC 904
Border Gateway Protocol
(BGP)
Like EGP, BGP exchanges
reachability information
between autonomous
systems but supports
nonhierarchical topologies.
BGP uses path attributes
to provide more information
about each route. Path
attributes can include, for
example, administrative
preferences based on
political, organizational,
or security considerations.
RFCs 1163, 1267, 1771
Router Discovery This protocol is used
to inform hosts of the
availability of routers that
it can send packets to, and
to supplement a statically
configured default router.
RFC 1256
_________________________ Note _________________________
The list in Table 5–1 is continually updated. For the latest details,
refer to the Compaq TCP/IP Services for OpenVMS Software Product
Description (SPD 46.46.xx).
The routing protocols described in Table 5–1 are configured in the GATED
configuration file, TCPIP$GATED.CONF. This file contains statements that control
tracing options, select routing protocols, manage routing information, and manage
independent system routing.
Under GATED, load balancing provides for identical routes based on the reference
count and use count (you can observe this through
netstat -r
). GATED chooses
Network Server Services 5–5