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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…
Read More »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…
Read More »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…
Read More »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…
Read More »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…
Read More »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…
Read More »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…
Read More »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…
Read More »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…
Read More »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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