ftp://ftp.ripe.net/ripe/stats/membership/alloclist.txt

https://en.wikipedia.org/wiki/Multiprotocol_BGP

https://he.net/HurricaneElectricNetworkMap.pdf

https://he.net/3d-map

https://he.net/layer2

https://rt-bgp.he.net

https://stat.ripe.net/widget/bgplay

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/15986-admin-distance.html

Note: Only the best paths received from BGP peers are propagated. Refer to BGP Best Path Selection Algorithm for more information on best path selection.

cust-R2# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
cust-R2(config)# ip route 192.168.0.0 255.255.0.0 Null0
cust-R2(config)# end


What is Null route

https://en.wikipedia.org/wiki/Null_route

https://learningnetwork.cisco.com/thread/26856

Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,

http://bgpmap.sdv.fr