[c-nsp] slow convergence on edge BGP routers

[Chris Evans]

If this is a test environment you could put policies in place to influence
traffic to come in your EDGE2, but meanwhile for outbound still have
traffic going out EDGE1. Then fail EDGE1 and see how long it takes..

That'll give you an answer if its inbound or outbound that is taking the 15
seconds. As others have already stated its mostly likely the internet is
taking 15 seconds to converge.

On Fri, Feb 27, 2015 at 4:43 AM, Gert Doering <gert at greenie.muc.de> wrote:

> Hi,
>
> On Fri, Feb 27, 2015 at 02:42:44AM +0100, jure brkljacic wrote:
> > When i shutdown the "upstream link" on EDGE1 all the traffic is rerouted
> to
> > EDGE 2 router, but i see 15sec complete outage. (the path the end system
> > takes in "internal router" ->>EDGE1->>EDGE2)
>
> I'd assume that this is external reconvergence - "The Internet" taking
> its time to re-route packets back to you via Edge 2.
>
> > how to minimize the traffic loss?
>
> That very much depends on where the two BGP sessions are going to.  If it's
> two different ISPs, there really isn't a way to make the Internet converge
> faster for you (there's work on graceful shutdown communities, which would
> help quite a lot, but that is not yet implemented or rolled out at a wider
> scale).
>
> If both links go to the same ISP, talk to them...
>
> gert
> --
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> Gert Doering - Munich, Germany
> gert at greenie.muc.de
> fax: +49-89-35655025
> gert at net.informatik.tu-muenchen.de
>
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