Deployment Guide

○ seconds: the range is from 1 to 65535 (the default is 40 seconds).
The dead interval must be four times the hello interval.
The dead interval must be the same on all routers in the OSPF network.
● Change the time interval between hello-packet transmission.
CONFIG-INTERFACE mode
ip ospf hello-interval seconds
○ seconds: the range is from 1 to 65535 (the default is 10 seconds).
The hello interval must be the same on all routers in the OSPF network.
● Use the MD5 algorithm to produce a message digest or key, which is sent instead of the key.
CONFIG-INTERFACE mode
ip ospf message-digest-key keyid md5 key
○ keyid: the range is from 1 to 255.
○ Key: a character string.
NOTE: Be sure to write down or otherwise record the key. You cannot learn the key after it is configured. You must be
careful when changing this key.
NOTE: You can configure a maximum of six digest keys on an interface. Of the available six digest keys, the switches
select the MD5 key that is common. The remaining MD5 keys are unused.
● Change the priority of the interface, which is used to determine the Designated Router for the OSPF broadcast network.
CONFIG-INTERFACE mode
ip ospf priority number
○ number: the range is from 0 to 255 (the default is 1).
● Change the retransmission interval between LSAs.
CONFIG-INTERFACE mode
ip ospf retransmit-interval seconds
○ seconds: the range is from 1 to 65535 (the default is 5 seconds).
The retransmit interval must be the same on all routers in the OSPF network.
● Change the wait period between link state update packets sent out the interface.
CONFIG-INTERFACE mode
ip ospf transmit-delay seconds
○ seconds: the range is from 1 to 65535 (the default is 1 second).
The transmit delay must be the same on all routers in the OSPF network.
To view interface configurations, use the show config command in CONFIGURATION INTERFACE mode.
To view interface status in the OSPF process, use the show ip ospf interface command in EXEC mode.
The bold lines in the example show the change on the interface. The change is reflected in the OSPF configuration.
Dell(conf-if)#ip ospf cost 45
Dell(conf-if)#show config
!
interface TengigabitEthernet 0/0
ip address 10.1.2.100 255.255.255.0
no shutdown
ip ospf cost 45
Dell(conf-if)#end
Dell#show ip ospf 34 interface
TengigabitEthernet 0/0 is up, line protocol is up
Internet Address 10.1.2.100/24, Area 2.2.2.2
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 45
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.1.2.100, Interface address 10.1.2.100
Backup Designated Router (ID) 10.1.2.100, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:06
Open Shortest Path First (OSPFv2 and OSPFv3)
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