prefix Deaggregation and inject map - BGP Design & Implementation Chap 4
this lab is directly taken from BGP Design & Implementation Chap 4. GNS3 configurations attached below. Summary - In the boarder router if the summary route injected as follows aggregate-address 172.16.0.0 255.255.0.0 as-set summary-only downwards the originality of the prefix may be lost therefore to specify the best exist path we can regenerate the path we use inject path . bgp inject-map Map1 exist-map Map2 Map1 injects the path Map2 checks whether path is available , it at least two match statements one is route-source & aggregate prefix. Whether u can inject weird prefix other than aggregate .. (eg aggregate is 172.16.0.0/16 but if you try to inject 10.0.0.0/24 ???) As usual you can't :) following is the attached diagram R5 Relevant configuration. router bgp 100 no synchronization bgp log-neighbor-changes bgp inject-map AS200-Specific exist-map AS200-aggregate neighbor 192.168.12.2 remote-as 100 neighbor 192.168.12.2 send-community neighbor 192.168.23....