Configuring OSPF
December 2005
© Foundry Networks, Inc.
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After you apply filters to block the outbound LSAs, the filtering occurs during the database synchronization and
flooding.
If you remove the filters, the blocked LSAs are automatically re-flooded. You do not need to reset OSPF to re-
flood the LSAs.
NOTE:
You cannot block LSAs on virtual links.
To apply a filter to an OSPF interface to block flooding of outbound LSAs on the interface, enter the following
command at the Interface configuration level for that interface.
FastIron SuperX Switch(config-if-1/1)# ip ospf database-filter all out
The command in this example blocks all outbound LSAs on the OSPF interface configured on port 1/1.
Syntax:
[no] ip ospf database-filter all out
To remove the filter, enter a command such as the following:
FastIron SuperX Switch(config-if-1/1)# no ip ospf database-filter all out
Configuring an OSPF Non-Broadcast Interface
Starting with release 02.3.01, the FESX and FSX Layer 3 switches support Non-Broadcast Multi-Access (NBMA)
networks. This feature enables you to configure an interface on a Foundry device to send OSPF traffic to its
neighbor as unicast packets rather than broadcast packets.
OSPF routers generally use broadcast packets to establish neighbor relationships and broadcast route updates on
Ethernet and virtual interfaces (VEs). In this release, as an alternative, you can configure the Foundry device to
use unicast packets for this purpose. This can be useful in situations where multicast traffic is not feasible (for
example when a firewall does not allow multicast packets).
On a non-broadcast interface, the routers at the other end of this interface must also be configured as non-
broadcast and neighbor routers. There is no restriction on the number of routers sharing a non-broadcast interface
(for example, through a hub/switch).
NOTE:
Only Ethernet interfaces or VEs can be configured as non-broadcast interfaces.
To configure an OSPF interface as a non-broadcast interface, enable the feature on a physical interface or a VE,
following the
ip ospf area
statement, and then specify the IP address of the neighbor in the OSPF configuration.
The non-broadcast interface configuration must be done on the OSPF routers on both ends of the link.
For example, the following commands configure VE 20 as a non-broadcast interface:
FESX424 router(config)# int ve 20
FESX424 router(config-vif-20)# ip ospf area 0
FESX424 router(config-vif-20)# ip ospf network non-broadcast
FESX424 router(config-vif-20)# exit
Syntax:
[no] ip ospf network non-broadcast
The following commands specify 1.1.20.1 as an OSPF neighbor address. The address specified must be in the
same sub-net as a non-broadcast interface.
FESX424 router(config)# router ospf
FESX424 router(config-ospf-router)# neighbor 1.1.20.1
For example, to configure the feature in a network with three routers connected by a hub or switch, each router
must have the linking interface configured as a non-broadcast interface, and both of the other routers must be
specified as neighbors.
The output of the
show ip ospf interface
command has been enhanced to display information about non-
broadcast interfaces and neighbors that are configured in the same sub-net. For example:
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