BGP-Case-Studies

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E. 0. 0. Solution 1: The first solution is to use a static route and redistribute it into BGP. ). 2 Page 61 Sam Halabi-cisco Systems Solution 2: In addition to the static route we add an entry for the network command, this will have the same effect except that the origin of the update will be set to IGP. 3 CIDR example 2 (as-set) AS-SETS are used in aggregation to reduce the size of the path information by listing the AS number only once, regardless of how many times it may have appeared in multiple paths that were aggregated.

2- Use BGP backdoor BGP backdoor will make the IGP route, the preferred route. Use the following command: network address backdoor. The configured network is the network that we would like to reach via IGP. For BGP this network will be treated as a locally assigned network except it will not be advertised in bgp updates. 0 will be treated as a local entry but will not be advertised as a normal network entry would. 0 from RTB via EIGRP with distance 90, and will also learn it from RTC via EBGP with distance 20.

0 BGP Filtering Sending and receiving BGP updates can be controlled by using a number of different filtering methods. BGP updates can be filtered based on route information, on path information or on communities. All methods will achieve the same results, choosing one over the other depends on the specific network configuration. 0 In order to restrict the routing information that the router learns or advertises, you can filter BGP based on routing updates to or from a particular neighbor. In order to achieve this, an access-list is defined and applied to the updates to or from a neighbor.

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