google ipv6 routes via cogent

Patrick W. Gilmore patrick at
Fri Mar 3 14:42:04 UTC 2017

On Mar 3, 2017, at 7:00 AM, Nick Hilliard <nick at> wrote:
> Niels Bakker wrote:
>> As I explained in the rest of my email that you conveniently didn't
>> quote, it's so that you can selectively import routes from all your
>> providers in situations where your router cannot handle a full table.
> it can also break horribly in situations where the provider is providing
> "transit" but doesn't provide full transit.
> OTOH, if you are single-homed, it is highly advisable to accept a
> default, the reason being that most transit providers provide bgp
> communities with "don't advertise to customers" semantics.  So if you're
> single-homed and use a full dfz feed without default route, you will not
> have full connectivity to all the routes available from the transit
> provider.

If you are single-homed, there is no need for BGP at all. And injecting your ASN into the table is probably not terribly useful to everyone else’s FIB.

There are, of course, corner cases. But in general, single-homed people shouldn’t be using BGP.


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