Lab 29 - OSPF Reducing LSA Flooding

Prerequisites: CCNP level skills.

Note!

Use the configuration from Lab6.

Topology

Pic. 1 - OSPF Topology.

Icons designed by: Andrzej Szoblik - http://www.newo.pl

Notice!
OSPF routers re-flood all LSAs every 30 minute (MaxAge).

Task 1

Configure area 1 so that the LSAs never age out in this area.

Lab Solution

Task 1

Configure area 1 so that the LSAs never age out in this area.

R1 OSPF Configuration:

!

interface FastEthernet1/0
 ip address 10.1.124.1 255.255.255.0
 ip ospf flood-reduction

!

R2 OSPF Configuration:

!

interface FastEthernet1/0
 ip address 10.1.124.2 255.255.255.0
 ip ospf flood-reduction

!

R4 OSPF Configuration:

!

interface FastEthernet1/0
 ip address 10.1.124.4 255.255.255.0
 ip ospf flood-reduction
!

interface Loopback0
 ip address 172.16.104.4 255.255.255.0
 ip ospf network point-to-point
 ip ospf flood-reduction
!

interface Loopback1
 ip address 172.16.144.4 255.255.255.0
 ip ospf network point-to-point
 ip ospf flood-reduction

!

Verification:

Pic. 1

Note!

Both R1 and R2 set DoNotAge flag in their LSAs.