Installing and Administering Internet Services

324 Chapter8
Configuring gated
Overview
NOTE Do not mix RIP and OSPF protocols within a single network, because the
routing information might conflict.
Table 8-1 compares the advantages and disadvantages of the RIP and
OSPF protocols.
gated supports the following exterior gateway protocols:
• EGP (External Gateway Protocol) is known as a “reachability”
protocol primarily because it permits a node on the NSFNET
backbone to exchange information with other backbone nodes about
whether a destination can be reached. 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
Table 8-1 Comparison of RIP and OSPF Protocols
RIP OSPF
Advantage: RIP is easy to configure. Disadvantage: OSPF is complicated to configure
and requires network design and planning.
Advantage: An end system (a system with only
one network interface) can run RIP in passive
mode to listen for routing information without
supplying any.
Disadvantage: OSPF does not have a passive
mode.
Disadvantage: RIP may be slow to adjust for link
failures.
Advantage: OSPF is quick to adjust for link
failures.
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 each router transmits only
information about its links instead of the whole
routing table, and because 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 well suited to large
networks, because RIP packet size increases as the
number of networks increases.
Advantage: OSPF works well in large networks.