OSPF CONFIGURATION DETAILS :

ON THE Core :

Configure point to point links to Distribution switches “ of the LAN “

interface GigabitEthernet3/1

! Configure IP Event Dampening on all links using sub-second timers and/or

switches configured with sub-second ! LSA or SPF throttle timers

Dampening

!Reduce OSPF hello and dead timers to 250 msec and 1 second. In a point-point

L3 campus

! design the OSPF timers are not the primary mechanism used for link and node

! failure detection. They are intended to provide a fail-safe mechanism only.

ip ospf dead-interval minimal hello-multiplier 4

router ospf 100

! at the Core It would be all Area 0 BackBone Area

! Explicitly configure the OSPF router id as a best practice when using identical

loopback address

! if the Link that Used is 10 GE

auto-cost reference-bandwidth 10000

!Tuning Ospf Timers

timers throttle spf 10 100 5000

timers throttle lsa all 10 100 5000

timers lsa arrival 80

On the Distribution :

Configure point to point links to Core switches

interface GigabitEthernet3/1

Dampening

ip ospf dead-interval minimal hello-multiplier 4

Configure point to point links to Access switches

interface GigabitEthernet3/1

Dampening

ip ospf dead-interval minimal hello-multiplier 4

ip ospf priority 255

router ospf 31

! at the Distribution It would be Area 0 with the Core and Totally Stub Area with

the Access Switches

Area 31 stub no-summary

Area 31 range 10.1.31.0 255.255.255.0

! if the Link that Used is 1 GE

auto-cost reference-bandwidth 1000

!Tuning Ospf Timers

timers throttle spf 10 100 5000

timers throttle lsa all 10 100 5000

timers lsa arrival 80

on the Access Switches :

Configure point to point links to Distribution switches

interface GigabitEthernet3/1

Dampening

ip ospf dead-interval minimal hello-multiplier 4

ip ospf priority 0

router ospf 31

! at the Access It would be Totally Stub Area with the Distribution Switches

Area 31 stub no-summary

! if the Link that Used is 1 GE

auto-cost reference-bandwidth 1000

!Tuning Ospf Timers

timers throttle spf 10 100 5000

timers throttle lsa all 10 100 5000

timers lsa arrival 80

Note ( THE LOOPBACK IP ADDRESS WOULD BE FROM THE RANGE OF

MANAGEMENT DEVICES VLAN ALSO WOULD BE THE ROUTER ID OF

THE OSFP )