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Configuring IP Unicast Routing
Configuring OSPF
DETAILED STEPS
Command Purpose
1. configure terminal Enter global configuration mode.
2. interface interface-id Enter interface configuration mode, and specify the Layer 3
interface to configure.
3. no shutdown Enable the interface if necessary. By default, UNIs and ENIs
are disabled and NNIs are enabled.
4. ip ospf cost (Optional) Explicitly specify the cost of sending a packet on
the interface.
5. ip ospf retransmit-interval seconds (Optional) Specify the number of seconds between link state
advertisement transmissions. The range is 1 to 65535
seconds. The default is 5 seconds.
6. ip ospf transmit-delay seconds (Optional) Set the estimated number of seconds to wait
before sending a link state update packet. The range is 1 to
65535 seconds. The default is 1 second.
7. ip ospf priority number (Optional) Set priority to help find the OSPF designated
router for a network. The range is from 0 to 255. The default
is 1.
8. ip ospf hello-interval seconds (Optional) Set the number of seconds between hello
packets sent on an OSPF interface. The value must be the
same for all nodes on a network. The range is 1 to 65535
seconds. The default is 10 seconds.
9. ip ospf dead-interval seconds (Optional) Set the number of seconds after the last device
hello packet was seen before its neighbors declare the
OSPF router to be down. The value must be the same for all
nodes on a network. The range is 1 to 65535 seconds. The
default is 4 times the hello interval.
10. ip ospf authentication-key key (Optional) Assign a password to be used by neighboring
OSPF routers. The password can be any string of
keyboard-entered characters up to 8 bytes in length. All
neighboring routers on the same network must have the
same password to exchange OSPF information.
11. ip ospf message digest-key keyid
md5 key
(Optional) Enable MDS authentication.
keyid—An identifier from 1 to 255.
key—An alphanumeric password of up to 16 bytes.
12. ip ospf database-filter all out (Optional) Block flooding of OSPF LSA packets to the
interface. By default, OSPF floods new LSAs over all
interfaces in the same area, except the interface on which
the LSA arrives.
13. end Return to privileged EXEC mode.
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