HP-UX Reference (11i v2 03/08) - 4 File Formats (vol 8)

g
gated.conf(4) gated.conf(4)
request
OSPF Link State Request packets which are used in synchronizing OSPF databases.
lsu OSPF Link State Update packets which are used in synchronizing OSPF databases.
ack OSPF Link State Ack packets which are used in synchronizing OSPF databases.
The Exterior Gateway Protocol (EGP)
The Exterior Gateway Protocol (EGP) is an exterior routing protocol used for exchanging routing informa-
tion with gateways in other autonomous systems. Unlike interior protocols, EGP propagates only reacha-
bility indications, not true metrics. EGP updates contain metrics, called distances which range from 0 to
255. GateD will only compare EGP distances learned from the same AS. them.
Before EGP sends routing information to a remote router, it must establish an adjacency with that router.
This is accomplished by an exchange of Hello (not to be confused with the HELLO protocol, or OSPF
HELLO messages) and I Heard You (I-H-U) messages with that router. Computers communicating via
EGP are called EGP neighbors, and the exchange of HELLO and I-H-U messages is referred to as acquir-
ing a neighbor. Once the neighbor is acquired, the system polls the neighbor for routing information.
The neighbor responds by sending an update containing routing information. If the system receives a poll
from its neighbor, it responds with its own update packet. When the system receives an update, it
includes routes from the update into its routing database. If the neighbor fails to respond to three con-
secutive polls, GateD assumes that the neighbor is down and removes the routes of that neighbor from its
database.
The EGP Statement
egp yes | no | on | off
[ {
preference preference ;
defaultmetric metric ;
packetsize number ;
traceoptions trace_options ;
group
[ peeras autonomous_system ]
[ localas autonomous_system ]
[ maxup number ]
{
neighbor host
[ metricout metric ]
[ preference preference ]
[ preference2 preference ]
[ ttl ttl ]
[ nogendefault ]
[ importdefault ]
[ exportdefault ]
[ gateway gateway ]
[ lcladdr local_address ]
[ sourcenet network ]
[ minhello | p1 time ]
[ minpoll | p2 time ]
[ traceoptions trace_options ]
;
};
} ] ;
preference preference
Sets the preference for routes learned from RIP. The default preference is 200. This preference
may be overridden by a preference specified on the group or neighbor statements or by
import policy.
defaultmetric metric ;
Defines the metric used when advertising routes via EGP. If not specified, the default value is
255 which some systems may consider unreachable. This choice of values requires you to expli-
citly specify a metric when exporting routes to EGP neighbors. This metric may be overridden
by a metric specified on the neighbor or group statements or in export policy.
HP-UX 11i Version 2: August 2003 − 23 − Hewlett-Packard Company Section 4−−99