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38-30
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 38 Configuring IP Unicast Routing
Configuring OSPF
Use the no form of these commands to remove the configured parameter value or return to the
default value.
Step 3
ip ospf cost (Optional) Explicitly specify the cost of sending a packet on the
interface.
Step 4
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.
Step 5
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.
Step 6
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.
Step 7
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.
Step 8
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.
Step 9
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.
Step 10
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.
Step 11
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.
Step 12
end Return to privileged EXEC mode.
Step 13
show ip ospf interface [interface-name] Display OSPF-related interface information.
Step 14
show ip ospf neighbor detail Display NSF awareness status of neighbor switch. The output
matches one of these examples:
• Options is 0x52
LLS Options is 0x1 (LR)
When both of these lines appear, the neighbor switch is NSF
aware.
• Options is 0x42—This means the neighbor switch is not NSF
aware.
Step 15
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose