Tag: bgp

BGP Multipath Load Balancing

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Scenario You’ve got a single multi-homed BGP connection to two ISPs. You want to load balance traffic to a specific destination but you have no control over what the ISPs are doing with that route as it traverses…

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BGP Troubleshooting

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Scenario: The fermentum corporation has hired you to troubleshoot their international network that consists of BGP routers. There are a number of issues. Some BGP routers are unable to establish a neighbor adjacency and others are having issues…

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BGP Neighbor Troubleshooting

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Scenario: As the network engineer for a large corporation you are responsible for the configuration of BGP. One of your colleagues tried to install some new routers and configure BGP between them but he got stuck and is…

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BGP Filtering Extended Access-List

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Scenario: Ever since Diablo was defeated Deckard Cain decided to become a network engineer. Two decades have passed and the village of Tristram has upgraded their network for inter-AS connectivity. Recently some security issues have been reported and…

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BGP AS Path Access List

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Scenario: Sugar Cane company is a international company that is growing at a rapid rate. To connect all the different sites BGP is used, the security officer however doesn’t want all the sites to have full connectivity and…

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BGP Conditional Advertisement

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Scenario: An international toy store company needs your help. They use BGP to exchange routing information between their sites but everytime one of their IBGP routers fails they have connectivity issues. Let’s see if you can help them…

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BGP Traffic Engineering Unsuppress-Map

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Scenario: The mystical creature corporation has a large international network of fantasy enthusiastics people sharing new mystical rumors. They are running BGP to exchange routing information between each other. At some point in the network you are aggregating…

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BGP Allow AS In

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Scenario: An international toy store company needs your help. They use BGP to exchange routing information between their sites but everytime one of their IBGP routers fails they have connectivity issues. Let’s see if you can help them…

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BGP TTL Security

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Scenario: After years of plumbing work you switched your career to become a network engineer. Besides being good at routing & switching you are very security-minded. One of your routers is connected to your brother’s network and you…

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BGP Soft Reconfiguration

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Scenario: You are a network engineer responsible for the network for a local fighting tournament. Two of the fighters exchange tactics using BGP to advertise the networks. They don’t want to exchange everything they know so they are…

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