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BGP Aggregation

Scenario: John and Jim are setting up their own ISP and start by configuring BGP between their routers. Because they want to make sure not to advertise too many prefixes they want to configure BGP aggregation. It’s up…

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BGP Max AS Limit

Scenario: AsianFish inc. is expanding their business towards Europe so they need to expand their network as well. BGP has been configured for inter-AS connectivity but you want to make sure you don’t receive just any prefix on…

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BGP DMZ Link Bandwidth

Scenario: You work for a greek ISP where you are known as “The Greek Wonder”. You solve routing problems faster than Zeus could shoot lightning bolts. One part of the network uses BGP and there are multiple links…

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BGP Attribute Router ID

Scenario: You are one of the trainees at a fairly small ISP. Your boss is on vacation and all colleagues are out of the office troubleshooting problems at customers. You receive a phonecall of one of the network…

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BGP Attribute AS Path Ignore

Scenario: You are responsible for a International network. All routers are connected through BGP. One of the network administrators in NewDelhi configure AS Path prepending for their AS so Paris will send all traffic through Sydney. You heard…

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BGP Peer Group

Scenario: Your autonomous system has a lot of IBGP routers. You are already familiar with route reflectors which saves you a lot of trouble configuring all the IBGP neighbor peerings. You just read about BGP peer groups which…

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BGP Synchronization

Scenario: You are a freelance network consultant specialized in solving BGP problems. One of your customers, a small ISP has trouble with customers that are unable to reach each other. They use BGP synchronization on some of their…

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BGP Next-Hop Self Manual

Scenario: As a junior networking engineer you were always fascinated with science fiction movies, that’s why you are now working at a company specialized in special effects. The closest you got to light speed was sending bits and…

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BGP Confederations

Scenario: You are the senior network engineer working for the federation of planets. BGP was developed on earth but is heavily used between planets as well. The network is expected to grow and to make you don’t go…

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BGP Route Reflectors and Clusters

Scenario: As the senior network engineer for a large international company you are always trying to optimize your network and get the most out of your time. The network has a lot of IBGP routers and you got…

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