BGP: Configuring Route Maps

Expanded lists use regular expressions to specify the communities. They can be identified by a number, or by the word expanded, and are created by using any of the following commands:

awplus(config)# ip community-list <100-199>{denypermit} <reg-exp>

awplus(config)# ip community-list expanded <list-name>{denypermit} <reg-exp>

You can have multiple entries in a community list. Entries are unnumbered, so each new entry gets added at the end of the list.

There is an implicit exclude all else entry at the end of the community list.

Applying Once you have created a community list, use it in a route map entry by using the command:

awplus(config-route-map)#match community <list> [exact-match]

The optional exact-match parameter specifies that the communities contained in the attribute section of the update message must exactly match the specified community list. If you do not specify exact-match, then the set of communities in the attribute list of the update message must include all the communities in the specified community list, but can also include other communities.

One or more prefixes, by using a prefix list

For information about creating a prefix list, see "About prefix lists" on page 22.

Once you have made the prefix list, apply it to the match clause of a route map entry by using the command:

awplus(config-route-map)#match ip address prefix-list <list-name>

A prefix list can match a subset of prefixes in an update message. You can use this to change the attributes of some of the prefixes in an outgoing update, without having to change the attributes of all the prefixes. However, an update message contains just one set of attributes, which must apply to all the prefixes in the update.

If a route map entry matches on some of the prefixes in a particular outgoing update message, and has an associated set clause that specifies a change to the attributes for those prefixes, then the switch splits the update into two update packets:

one that contains the original attribute values and the prefixes that were not included by the route map entry, and

one that contains the new attribute values and the prefixes that were included by the route map entry.

One or more prefixes, by using an ACL

An ACL is an alternative to a prefix list for matching a prefix in an update message.

For information about creating an ACL, see "About ACLs" on page 11.

Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes Page 29

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Allied Telesis X8100, x908 manual One or more prefixes, by using a prefix list, One or more prefixes, by using an ACL
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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.

The Allied Telesis x908 series consists of modular and chassis-based systems that can accommodate a variety of network configurations. One of the main features of the x908 series is its ability to offer high scalability with support for a large number of ports. This makes it suitable for data centers and large enterprise networks where space and bandwidth optimization are critical.

In addition to scalability, the x908 series supports advanced Layer 2 and Layer 3 switching capabilities. This allows for efficient traffic management and routing, ensuring that data is delivered swiftly and reliably. The x908 also incorporates intelligent features such as Quality of Service (QoS), which prioritizes critical network traffic, ensuring that time-sensitive data—like voice and video—maintains its quality during transmission.

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.

Another hallmark of the x908 and SwitchBlade series is their support for high-speed Ethernet technologies, including 10G and 40G Ethernet. This enables organizations to keep pace with the increasing bandwidth demands of applications and services, particularly in cloud computing and data-intensive workloads.

Both the x908 and the SwitchBlade x900 series are designed with energy efficiency in mind, featuring power-saving technologies that reduce overall operational costs. Coupled with Allied Telesis' management tools, which provide detailed analytics and monitoring, network administrators can optimize performance and energy consumption simultaneously.

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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