Reference v4.1.0 Instruction Manual

376 Network OS Command Reference
53-1003115-01
ip ospf database-filter
2
ip ospf database-filter
Configures filters for different types of outgoing Link State Advertisements (LSAs).
Synopsis ip ospf database-filter {all-external {allow-default-and-type-4 | allow-default-out | out}| all-out |
all-summary-external {allow-default-and-type-4 | allow-default-out | out}}
no ip ospf database-filter all-external
no ip ospf database-filter all-out
no ip ospf database-filter all-summary-external
Operands all-external Blocks all external LSAs.
allow-default-and-type-4
Allows default-route LSAs and Type 4 LSAs, but block all other LSAs.
allow-default-out Allows default-route LSAs, but block all other LSAs.
out Filters outgoing LSAs.
all-out Blocks all LSAs.
all-summary-external Blocks all summary (Type 3) and external (type 5) LSAs.
Defaults All filters are disabled.
Command Modes Interface subtype configuration mode
Description Use this command to configure filters for different types of outgoing LSAs.
Usage Guidelines By default, the device floods all outbound LSAs on all the OSPF interfaces within an area. You can
configure a filter to block outbound LSAs on an OSPF interface. This feature is particularly useful
when you want to block LSAs from some, but not all, of the interfaces attached to the area. When
enabled, this command blocks the specified outgoing LSAs on the interface. Some cases where
you might want to enable filters are:
• To control the information being advertised to the network.
• To use a passive router for debugging only.
Enter no ip ospf database-filter followed by the appropriate operands to disable this configuration.
NOTE
You cannot block LSAs on virtual links.
Examples To apply a filter to block flooding of all LSAs on a specific OSPF 40-gigabit Ethernet interface:
switch(config)# interface fortygigabitethernet 101/0/10
switch(conf-if-fo-101/0/10)# ip ospf database-filter all-out
To apply a filter to block flooding of all LSAs on a specific OSPF virtual Ethernet (VE) interface:
switch(config)# rbridge-id 178
switch(config-rbridge-id-178)# interface ve 24
switch(config-ve-24)# ip ospf database-filter all-out