Chapter 6: BGP Configuration Guide

To import all routes (.* matches all AS paths) with the default preference:

ip-router policy create bgp-import-source allOthers aspath-regular- expression "(.*)" origin any sequence-number 20

ip-router policy import source allOthers network all

To export all active routes from 284 or 813 or 814 or 815 or 816 or 3369 or 3561 to autonomous system 64800.

ip-router policy create bgp-export-destination to-64800 autonomous- system 64800

ip-router policy create aspath-export-source allRoutes aspath-regular- expression "(.*(28481381481581633693561) .*)" origin any protocol all

ip-router policy export destination to-64800 source allRoutes network all

Using the AS Path Prepend Feature

When BGP compares two advertisements of the same prefix that have differing AS paths, the default action is to prefer the path with the lowest number of transit AS hops; in other words, the preference is for the shorter AS path length. The AS path prepend feature is a way to manipulate AS path attributes to influence downstream route selection. AS path prepend involves inserting the originating AS into the beginning of the AS prior to announcing the route to the exterior neighbor.

Lengthening the AS path makes the path less desirable than would otherwise be the case. However, this method of influencing downstream path selection is feasible only when comparing prefixes of the same length because an instance of a more specific prefix always is preferable.

On the SSR, the number of instances of an AS that are put in the route advertisement is controlled by the as-countoption of the bgp set peer-hostcommand.

The following is an example:

#

#insert two instances of the AS when advertising the route to this peer

bgp set peer-host 194.178.244.33 group nlnet as-count 2

#insert three instances of the AS when advertising the route to this

#peer

#

bgp set peer-host 194.109.86.5 group webnet as-count 3

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Cabletron Systems 9032578-02 manual Using the AS Path Prepend Feature
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9032578-02 specifications

Cabletron Systems 9032578-02 is a notable component in the realm of networking equipment, especially recognized for its robust performance and reliability. As part of Cabletron’s commitment to delivering high-quality networking solutions, this device has become integral for many organizations seeking efficient data management.

One of the standout features of the 9032578-02 is its advanced switching capabilities. With the ability to manage multiple data streams seamlessly, it ensures that data packets are routed efficiently, minimizing latency and maximizing throughput. This is particularly crucial in environments where high-volume data transfer is the norm, such as in data centers or enterprises with extensive digital infrastructures.

The device is equipped with various connectivity options that enhance its versatility. These include support for multiple types of network interfaces, allowing for easy integration into existing systems. Whether it's Ethernet connections or fiber optics, the 9032578-02 accommodates diverse network requirements, making it suitable for various applications across different industries.

In terms of technology, the Cabletron Systems 9032578-02 employs cutting-edge networking protocols that ensure secure and reliable communication. This includes support for both IPv4 and IPv6 protocols, which future-proofs the device as organizations transition to newer standards. The incorporation of Quality of Service (QoS) features further enhances its capability to prioritize critical network traffic, ensuring that bandwidth-intensive applications receive the necessary resources for optimal performance.

Another critical characteristic of the 9032578-02 is its scalability. Organizations can expand their network infrastructure without the need for complete system overhauls. This modularity allows businesses to grow and adapt to changing demands while maintaining investment in their existing technology.

Additionally, Cabletron integrates advanced monitoring and management tools within the 9032578-02. Network administrators can easily track performance metrics, analyze traffic patterns, and troubleshoot issues in real-time. This level of visibility is essential for maintaining a stable network environment, particularly in dynamic organizational settings.

In summary, Cabletron Systems 9032578-02 is synonymous with high performance, scalability, and advanced technology. Its comprehensive features make it an excellent choice for organizations requiring reliable networking solutions that can adapt to evolving demands and ensure efficient data communication across their systems.
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