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Conﬁguring gated

Specifying Route Preference

Chapter 394

Specifying Route Preference

gated maintains a routing table that consists of the route information

learned from OSPF and from other active routing protocols, such as RIP

or EGP. You can also conﬁgure static routes in the /etc/gated.conf ﬁle

with one or more static clauses (see “Installing Static Routes” on

page 90 for more information).

The gated routing pool can therefore contain multiple routes to a single

destination. When multiple routes exist, the route chosen by gated is

determined by the following (in order of precedence):

• The preference value associated with the route. The preference

value is a number in the range from 0 (most preferred) to 255 (least

preferred). Routes from different sources have different default

preference values. For example, OSPF routes within a given AS have

a preference value of 10. Table 3-3 shows the default preference

values of various types of routes.

• If multiple routes use the same protocol and have the same

preference value, the route with the lowest metric or cost is chosen.

• If metric or cost is the same, the router with the lowest IP address is

chosen.

Table 3-3 Default Preference Values of Routes

Route Type Preference /etc/gated.config Conﬁguration

Interface

routes

0 Can be changed with interface

statement in Interface class.

OSPF inter-

and intra-areas

10 Cannot be changed.

Internal

default

20 Generated by BGP or EGP when

routing information is learned from

a peer.

ICMP Redirect 30 Can be changed with redirect

statement in Protocol class.

SNMP 50 Can be changed in SNMP statement in

Protocol class.

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HP 11i User Manual Page 94