AIS Router AI2524 - Manual (Page 145)

Chapter 8: AI2524 Protocol Configuration Steps
August 1997 Page 8-7
2524UM
Create Virtual Links
In OSPF, all areas must be connected to a backbone area. If there is
break in backbone continuity, or if the backbone is purposefully parti-
tioned, you can establish a virtual link.
To establish a virtual link, type this command in router configuration
mode:
area area-id virtual-link router-id [hello-
interval seconds ] [retransmit-interval
seconds ] [transmit-delay seconds ]
[deadinterval seconds ] [[authentication-key
key ] | [message-digest-key keyid md5 key ]]
To display information about virtual links, use th show ip ospf
virtual-links EXEC command. To display the router ID of an
OSPF router, use the show ip ospf EXEC command.
Generate a Default Route
You can force an autonomous system boundary router to generate a
default route into an OSPF routing domain. Whenever you specifically
configure redistribution of routes into an OSPF routing domain, th
router automatically becomes an autonomous system boundary router.
However, an autonomous system boundary router does not, by default,
generate a default route into the OSPF routing domain.
To force the autonomous system boundary router to generate a default
route, type this command in router configuration mode:
default-information originate [always]
[metric metricvalue ] [metric-type type-
value ] [route-map map-name ]
Configure Lookup of DNS Names
You can configure OSPF to look up Domain Naming System (DNS)
names for use in all OSPF show command displays. This featur
makes it easier to identify a router, because it is displayed by nam
rather than by its router ID or neighbor ID.
To configure DNS name lookup, type this command in global config-
uration mode
ip ospf name-lookup