OSPF: Configuring Route Maps for Filtering and Modifying OSPF Routes

OSPF: Configuring Route Maps for Filtering and Modifying OSPF Routes

For information about route maps and their structure, see "Structure of a route map" on page 26.

Route maps can be applied to OSPF routes as well as BGP routes. Of course, the route maps that can be used with OSPF are rather limited in comparison with those that are used with BGP, as OSPF route updates do not carry attributes in the way that BGP route updates do.

Also, OSPF route maps can only be applied to importing:

OSPF-learnt routes into the main IP route table, or

static, BGP or RIP routes into OSPF

Filtering cannot:

remove an entry from the LSA database once the entry has been added

prevent the router from advertising an LSA database entry to interfaces in the same area that the entry is relevant to

prevent updates that OSPF learns from being put into the LSA database

change the properties of an entry in the LSA database

This is because OSPF shares LSAs between all the routers in an area. The protocol assumes that all the routers in the area have shared all the advertisements among each other, and that all agree on the state of the complete link state database for the area. If some routers in the area are learning, but not advertising, that breaks the OSPF model.

Configuring a match clause

A match clause can match on the following criteria.

Note: When configuring a match clause, make sure you are in route map mode. The prompt should look like: awplus(config-route-map)#

Metric

The entry will match all routes whose metric is equal to that specified in the clause.

To match a metric value, use the command:

match metric <value>

Interface

The entry will match all routes learnt via the specified VLAN.

To match a VLAN, use the command:

match interface <vlan>

Page 50 Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes

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Allied Telesis x908, X8100 manual OSPF Configuring Route Maps for Filtering and Modifying OSPF Routes, Metric, Interface
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X8100, x908 specifications

The Allied Telesis x908 and the SwitchBlade x900 series of network switches are cutting-edge solutions designed to address the demands of modern networking environments. These switches are known for their high performance, reliability, and robust feature sets, making them ideal for enterprise and service provider networks.

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The SwitchBlade x900 series takes this functionality further with its innovative modular architecture. This allows organizations to configure their networks to meet specific needs by choosing from a variety of interface cards and service modules. The SwitchBlade x900 also supports advanced security features such as Access Control Lists (ACLs) and VLAN segmentation, which provide enhanced protection against unauthorized access and network threats.

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In summary, the Allied Telesis x908 and SwitchBlade x900 series offer a comprehensive suite of features, high performance, scalability, and advanced networking technologies. They represent a strategic investment for organizations looking to build resilient, efficient, and future-proof network infrastructures.
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