[nog] BGP communities

Vasil Kolev vasil at ludost.net
Fri Oct 21 18:14:04 EEST 2016

On Fri, 21 Oct 2016 17:59:21 +0300
Marian Marinov <mm at 1h.com> wrote:

> Hello guys,
> I'm considering nogetiating BGP communities with my upstreams.
> Each of my uptreams has two or more upstreams. Ideally what I want to
> do is have a community for each of the uptreams of my isps.
> What would be the best configuration scheme. And I don't mean router
> configuration but choosing communities and mapping them to each ISP.
> I'm currently running bird for BGP and I have 12 BGP sessions of
> which 8 are for international traffic.
> Each of my ISPs gives me two separate links, so two BGP sessions.
> Should I agree on the same communities between me and the ISP via
> both links(which I believe to be the correct assumption) or should I
> configure different communites for each link?
> What do you consider BCP?
If none of them has community support, you can try to ask them for
both, the question is mostly what do you want. Some good examples are
Level3 https://onestep.net/communities/as3356/ and Tinet
https://onestep.net/communities/as3257/ , but in the end the question
is what do you want to be able to do with inbound and outbound
communities and the upstreams can support that.

(for example, He.net only have a blackhole community, which they enable
only if you ask, and refuse to do anything else, probably because they
don't want to give anyone that much control over their routing).
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