Allied Telesis AT-S83 - Manual (Page 320)

Chapter 15: Open Shortest Path First (OSPF) Commands
320
IP OSPF DATABASE-FILTER
Syntax
ip ospf (A.B.C.D) database-filter all out
no ip ospf (A.B.C.D) database-filter
Parameters
A.B.C.D Specifies the IP address of the interface. This is an
optional parameter.
all Specifies all LSAs are filtered.
out Specifies outgoing LSAs are filtered.
Description
Use the IP OSPF DATABASE-FILTER command to turn on the LSA
database-filter for a particular interface. By default, this command is
disabled which means that all outgoing LSAs are flooded to the interface.
OSPF floods new LSAs over all interfaces in an area, except the interface
on which the LSA arrives. This redundancy ensures robust flooding.
However, too much redundancy can waste bandwidth and might lead to
excessive link and CPU usage in certain topologies, resulting in
destabilizing the network. To avoid this issue, use the IP OSPF
DATABASE-FILTER command to block flooding of LSAs over specified
interfaces.
Use the no form of this command to turn off the filter.
Command Mode
Interface mode
Example
The following example filters all LSAs and outgoing LSAs on interface 3:
switch# configure terminal
switch(config)# interface xe3
switch(config-if)# ip ospf database-filter all out