HP 600 Series, Services And Applications

Page: 119 / 316

OSPF enables you to configure variable-length subnet masks on different
subnetworks, which can be used to conserve IP address space. OSPF
enables you to configure a password so that all OSPF messages received will
be authenticated for added network security. Like RIP, OSPF allows you to
configure interface cost, but has a maximum value of 65535. Additionally,
OSPF enables you to configure the intervals for the transmission of the
following:
Messages to elect the designated router
Messages to determine whether a silent router is down
OSPF advertisements
For more information on RIP and OSPF, refer to the reference manual for
the HP routers.
EGP Exterior Gateway Protocol, EGP, is a protocol for exchanging
network reachability information between routers in different autono-
mous systems. When connecting an autonomous system to the Internet,
every autonomous system must use EGP to advertise network reachabil-
ity to the Internet’s core gateway system. The Internet is a globally
administered confederation of autonomous systems (networks).
Note that any or all of the supported routing protocols may be active on the
router simultaneously. Each of the routing protocols derives its routes using
different algorithms, presenting the possibility of having multiple routes for
a single destination. The routing table, however, can contain only one entry
for each destination subnetwork and will select that entry with the following
order of precedence:
Highest Preference: Static Routes
Routes derived from OSPF
Routes derived from EGP
Lowest Preference: Routes derived from RIP
For more information on EGP and static routes, refer to the IP chapter in the
reference manual.
R
o
u
ti
n
g
S
e
r
v
ic
e
s
N
o
te
s
2
Internet Protocol Routing Service
IP Routing Decisions
2-67