Brocade Communications Systems FastIron X Series User Manual

Block ooding of outbound LSAs on specic OSPF interfaces
By default, the device oods all outbound LSAs on all the OSPF interfaces within an area. You can congure a lter 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.
This command blocks all outbound LSAs to provide options for selective blocking of LSAs.
After you apply lters to block the outbound LSAs, the ltering occurs during the database synchronization and ooding. When a ltering
conguration is changed on a interface, all adjacencies on the interface are set to the Extstart state to restart the database exchange
process. In cases where an LSA has already been ooded on an interface prior to application of the LSA lter, the LSA will not be ushed
out from the remote neighbors. In this situation the user must clear the link state database and the adjacencies on all remote neighbors to
ush out the leaked LSAs or wait for the LSAs to be aged out.
If you remove the lters, the blocked LSAs are automatically re-ooded. You do not need to reset OSPF to re-ood the LSAs.
NOTE
You cannot block LSAs on virtual links, and LSA ltering is not supported on sham
links.
To apply a lter to an OSPF interface to block ooding of outbound LSAs on the interface, enter the following command at the Interface
conguration level for that interface.
device(config-if-e10000-1/1/1)# ip ospf database-filter all out
The command in this example blocks all outbound LSAs on the OSPF interface
congured on port 1/1/1.
Syntax: [no] ip ospf database-lter { all | all-external [ allow-default | allow-default-and-type4 ] | all-summary-external [ allow-default
| allow-default-and-type4 ] } out
The all parameter directs the router to block all outbound LSAs on the OSPF interface.
The all-external option directs the router to allow the following LSAs: Router, Network, Opq-Area-TE, Opq-Link-Graceful and Type-3
Summary while it blocks all Type-4 and Type-5 LSAs unless directed by one of the following keywords:
allow-default - allows only Type-5 default LSAs.
allow-default-and-type4 - allows Type-5 default LSAs and all Type 4 LSAs.
The all-summary-external option directs the router to allow the following LSAs: Router, Network, Opq-Area-TE and Opq-Link-Graceful
while it blocks all Type-3, Type-4 and Type-5 LSAs unless directed by one of the following keywords:
allow-default - allows only Type-3 or Type-5 default LSAs.
allow-default-and-type4 - allows Type-3 or Type-5 default LSAs and all Type 4 LSAs.
All Type-7 LSAs are always ltered if the ip ospf database-lter command is enabled.
By default, OSPF LSA ltering is disabled on all interfaces.
To remove the lter, enter a command such as the following.
device(config-if-e10000-1/1/1)# no ip ospf database-filter all out
Assign virtual links
All ABRs (area border routers) must have either a direct or indirect link to the OSPF backbone area (0.0.0.0 or 0). If an ABR does not
have a physical link to the area backbone, the ABR can congure a virtual link to another router within the same area, which has a
physical connection to the area backbone.
Conguring OSPF
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 243

Brocade Communications Systems FastIron X Series Specifications

General

Brand	Brocade Communications Systems
Model	FastIron X Series
Category	Switch
Language	English