835
Configuring IP Unicast Routing
Configuring OSPF
DETAILED STEPS
EXAMPLE
In the following example, the summary address 10.1.0.0 includes address 10.1.1.0, 10.1.2.0, 10.1.3.0, and so on. Only
the address 10.1.0.0 is advertised in an external link-state advertisement.
Command Purpose
1. configure terminal Enter global configuration mode.
2. router ospf process-id Enable OSPF routing, and enter router configuration mode.
3. summary-address address mask (Optional) Specify an address and IP subnet mask for
redistributed routes so that only one summary route is
advertised.
4. area area-id virtual-link router-id
[hello-interval seconds]
[retransmit-interval seconds] [trans]
[[authentication-key key] |
message-digest-key keyid md5 key]]
(Optional) Establish a virtual link and set its parameters. See
Configuring OSPF Interfaces, page 827 for parameter
definitions and the Default OSPF Configuration, page 825
for virtual link defaults.
5. default-information originate
[always] [metric metric-value]
[metric-type type-value] [route-map
map-name]
(Optional) Force the ASBR to generate a default route into
the OSPF routing domain. Parameters are all optional.
6. ip ospf name-lookup (Optional) Configure DNS name lookup. The default is
disabled.
7. ip auto-cost reference-bandwidth
ref-bw
(Optional) Specify an address range for which a single route
will be advertised. Use this command only with area border
routers.
8. distance ospf {[inter-area dist1]
[inter-area dist2] [external dist3]}
(Optional) Change the OSPF distance values. The default
distance for each type of route is 110. The range is 1 to 255.
9. passive-interface
type number (Optional) Suppress the sending of hello packets through the
specified interface.
10. timers throttle spf spf-delay
spf-holdtime spf-wait
(Optional) Configure route calculation timers.
spf-delay—Delay between receiving a change to SPF
calculation. The range is from 1 to 600000 miliseconds.
spf-holdtime—Delay between first and second SPF
calculation. The range is form 1 to 600000 in
milliseconds.
spf-wait—Maximum wait time in milliseconds for SPF
calculations. The range is from 1 to 600000 in
milliseconds.
11. ospf log-adj-changes (Optional) Send syslog message when a neighbor state
changes.
12. end Return to privileged EXEC mode.
13. show ip ospf [process-id [area-id]]
database
Display lists of information related to the OSPF database for
a specific router. For some of the keyword options, see
Monitoring OSPF, page 837.
14. copy running-config startup-config (Optional) Save your entries in the configuration file.
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