trying to understand how this BGP is setup for my network
I have never seen BGP set up this way so I was hoping someone could at least break it down for me. I would appreciate it if someone could break it down kind of line-by-line and then explain how it all works together.
Re: trying to understand how this BGP is setup for my network
your router in AS xxxx will advertise nets 100.150/16 and 120.220/16 if they are present in its routing table by any mean/source : static routes, dynamic routing protocol like OSPF.
Your router has two external eBGP neighbors.
For The first neighbor providerA the settings are:
the prefixes 100.150/16 and 120.220/16 if present are advertised any other prefix present in the BGP table is not sent to it
all prefixes received by providerA are accepted and their local preference attribute is increased to 200 (default 100 highest is best)
For eBGP neighbor V-provider settings are:
of all prefixes that V-provider sends to local router accepts in BGP table those that have an AS path attribute that contain only AS 56371 = prefixes that are locally generated in V-provider all other prefixes received, if any, are filtered. Local preference is raised to 200 for accepted prefixes.
To V-provider the same two prefixes 100.150/16 and 120.220/16 are sent by local router but their BGP AS path attribute is modified to look like longer (more AS hops) by prepending (the local router AS number xxxx will appear multiple times as seen by V-provider router it should appear 3+1 times)
Here the strategy is that provider-A is primary probably providing a full routing table.
V-provider is a backup provider that is probably providing a default route and a few local routes (or only default route it depends on V-provider settings)
The use of prepending is an effort to influence return path to local AS via primary provider (preferred because not prepended).
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