An outgoing filter that uses an AS-path list

BGP: Configuring AS Path Filters

9.Check that the AS path list shows the two filter entries:

awplus(config-router)#do show ip as-path-access-list

AS path access list list1 deny 23456

permit 34568

An outgoing filter that uses an AS-path list

Another example

1.Create an AS-PATH list that denies empty AS Paths, but allows AS Paths that contain the AS number 34567.

ip as-path access-list example deny ^$

ip as-path access-list example permit 34567

2.Apply this as the out route map for neighbor 45.45.45.46. neighbor 45.45.45.46 filter-list example out

3.Shut down the neighbor, and then bring it up again.

awplus(config-router)#neighbor 45.45.45.46 shutdown awplus(config-router)#neighbor 45.45.45.46 no shutdown

4.There are no routes advertised to the other side, so that says that the AS Path in the update packets is not 34567 at the point where the updates are passed to the out-going filter.

5.Now remove the deny entry for empty AS-paths, and add an allow entry for empty AS_paths.

(config)#no ip as-path access-list example deny ^$ (config)#ip as-path access-list example permit ^$

The as-path list becomes:

ip as-path access-list example permit 34567 ip as-path access-list example permit ^$

6.Shut down the neighbor, and then bring it up again.

awplus(config-router)#neighbor 45.45.45.46 shutdown awplus(config-router)#neighbor 45.45.45.46 no shutdown

Now the routes are received by the neighbor. That does demonstrate that the AS-paths in the updates are empty at the moment they are examined by the filter. But, in the neighbor's

Page 20 Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes

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Allied Telesis x908, X8100 manual Another example, An outgoing filter that uses an AS-path list

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.