BGP-Case-Studies

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0 We would like RTB above to set the community attribute to the bgp routes it is advertising such that RTC would not propagate these routes to its external peers. 2 Page 50 Sam Halabi-cisco Systems Note that we have used the route-map setcommunity in order to set the community to no-export. Note also that we had to use the “neighbor send-community” command in order to send this attribute to RTC. When RTC gets the updates with the attribute no-export, it will not propagate them to its external peer RTA.

0 to two different ASs: AS100 and AS200. 0 via two different routes, the first route is via AS100 with path (100, 300) and the second one is via AS400 with path (400, 200,300). Assuming that all other attributes are the same, AS600 will pick the shortest path and will choose the route via AS100. AS300 will be getting all its traffic via AS100. If we want to influence this decision from the AS300 end we can make the path through AS100 look like it is longer than the path going through AS400. We can do this by prepending autonomous system numbers to the existing path info advertised to AS100.

0. 0 to RTA. 0 to RTA. 1 Aggregate Commands There is a wide range of aggregate commands. It is important to understand how each one works in order to have the desired aggregation behavior. The first command is the one used in the previous example: aggregate-address address mask This will advertise the prefix route, and all of the more specific routes. 0 from being also propagated to RTA. 0 have been propagated to RTA. This is what we mean by advertising the prefix and the more specific route. Please note that you can not aggregate an address if you do not have a more specific route of that address in the BGP routing table.

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