[j-nsp] Bandwidth aware using BGP on ISP transit

[Adam Vitkovsky]

> tim tiriche
> Sent: Sunday, January 24, 2016 10:36 AM
>
> Hello,
>
> How do big companies manage traffic on ISP links automatically.
>
> For eg: I have 10 ISP/Transit links and all announcing the same prefixes.
>
> During a DDOS attack, one of the ISP link got saturated.
>
> I would like to be able to do something if bandwidth exceeds 50% use other
> links.
>
> In MPLS, we can leverage RSVP subscription.  Is there a way to automate this
> for Transit peers?
>
> In the past, i have used aspath for certain prefixes which is slow and does not
> help for short lived DDOS attacks.
>
Hello Tim,

1)
You can use flow telemetry to identify the prefixes under attack (in-house tool or IDS)
Flow collector or IDS can trigger a script that will prepend all but the prefixes under attack on one of the upstream links.(sink holing DDOS traffic to one link)
Result is one upstream link is used solely by the DDOS traffic while other links can service legit traffic.
2)
You can then redirect this DDOS traffic to your closest scrubbing centre (in-house tool or IPS)
3)
Then send the clear traffic to your customer

Or you can use your upstream ISPs' scrubbing services (usually limited) or use third party scrubbing companies.

adam


        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
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