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Overview
The gated Routing Daemon
Chapter 126
gated supports the following exterior gateway protocols:
• The External Gateway Protocol (EGP) permits a node on the
NSFNET backbone to exchange information with other backbone
nodes about reaching a destination. You can use EGP to
communicate routing information between autonomous systems. The
EGP protocol will be obsoleted in a future release of HP-UX. Use
BGP instead of the EGP protocol. BGP offers more flexibility and
requires less bandwidth than EGP.
• The Border Gateway Protocol (BGP) is intended as a replacement for
EGP. BGP uses path attributes to select routes. One of the attributes
that BGP can pass is the sequence of autonomous systems that must
be traversed to reach a destination. gated supports BGP Versions 2,
3, and 4, as described in RFCs 1163 and 1267.
gated also supports the Router Discovery Protocol (RDP), which is
neither an interior nor an exterior gateway protocol. RDP is used to
inform hosts of the existence of routers to which the hosts can send
Disadvantage: RIP generates
more protocol traffic than OSPF,
because it propagates routing
information by periodically
transmitting the entire routing
table to neighbor routers.
Advantage: OSPF generates less
protocol traffic than RIP,
because (i) Each router
transmits information only
about its links instead of the
whole routing table, and (ii)
OSPF allows you to divide an
autonomous system into areas,
each with a designated router
that exchanges inter-area
routing information with other
routers. Intra-area routing
information is isolated to a
single area.
Disadvantage: RIP is not
appropriate for large networks,
because RIP packet size
increases as the number of
networks increases.
Advantage: OSPF works well in
large networks.
Table 1-1 Comparison of RIP and OSPF Protocols (Continued)
RIP OSPF