BGP: Configuring Route Maps

BGP: Configuring Route Maps

Route maps are very powerful and flexible entities. Therefore, the configuring of route maps must, by necessity, be relatively complex. The purpose of this section of the document is to understand route maps piece by piece and thereby build up a full understanding of how all the parts fit together.

Structure of a route map

There are various levels of structure within a route map:

A route map is an entity with a name

Each route map consists of multiple entries, identified by sequence numbers

Each entry can consist of multiple clauses

In effect, an entry defines an individual filter. It can have a match clause that defines what it will match on, and it can have multiple set clauses that can specify actions to be taken. An update packet is matched against each entry in turn. Once an entry is found that matches the packet, the action(s) associated with that entry is (are) performed, and no further entries are considered.

For example, if you create an entry that will permit an update packet, followed by an entry that would deny that packet, the packet is permitted. As another example, if you create two conflicting set clauses, in different entries, the first change is applied, not the second.

A route-map consists of an ordered set of entries. Each entry is configured by commands of the form:

route-map <map-name> permitdeny <sequence number> <match clause>

<set clause(s)>

There is no need for a command that creates a route-map prior to entries being created in the route-map. Simply, the first time an entry is created for route-map <name> then that route-map comes into existence.

The sequence numbers determine the order in which the entries are applied to update packets. A route-map entry is not required to include a match clause. An entry with no match clause will match every date packet.

There is an implicit match all filter at the end of the route map. The action on that implicit entry is deny. By default, any update packet that does not explicitly match any particular entry in the route map will be dropped.

You can change this by ending the route map with a “permit all” clause, such as the following:

awplus(config)# route-map <map-name> permit 65535

Page 26 Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes

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Allied Telesis x908, X8100 manual BGP Configuring Route Maps, Structure of a route map
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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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