[189761] in North American Network Operators' Group
AW: Traffic engineering and peering for CDNs
daemon@ATHENA.MIT.EDU (Bernd Spiess)
Mon Jun 6 13:59:50 2016
X-Original-To: nanog@nanog.org
From: Bernd Spiess <bernd.spiess@ip-it.com>
To: Graham Johnston <johnstong@westmancom.com>, "'nanog@nanog.org'"
<nanog@nanog.org>
Date: Mon, 6 Jun 2016 17:56:07 +0000
In-Reply-To: <82C0CE81789FE64D8F4D152631918297B18660@MSG6.westman.int>
Errors-To: nanog-bounces@nanog.org
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Hi Graham!
In addition to the other two comments, I=B4d like to add some topics:
> Lately I have been putting in some effort to maximize our IX =
connections
by=20
> trying to work with the top 5-ish list of ASNs that still send us =
traffic
via a paid=20
> transit connection despite the fact that we are both present on the =
same
IX(s).=20
> In one case I missed the fact that one ASN wasn't using the IXs
route-servers,=20
> that's on me for not spotting that one.
This brings up some ideas ... see here:
1) Check if the CDN is on the routeserver
2) Check if the CDN has maybe tagged his prefixes with a =
"do-not-announce"
tag (verify at looking glass) (relevant of course only for outbound =
traffic)
3) Try to establish a direct peering session with the CDN over the IXP =
so
that you are known to the CDN=20
... some CDN=B4s could maybe also prefer or have higher priority on =
direct
sessions than via only routeserver...
... quite some networks give you a larger set of prefixes on a direct
session...
4) Talk with the CDN and check his geolocation tagging's for your =
prefixes
and maybe let correct them after you have found out what they are doing
5) Think on the fact, that CDN=B4s could take their routing decision on =
the
geo-location of the used dns resolver server and not on the users ip =
address
6) Check, that your network or your customers are not referring to =
public
dns resolvers
7) Think on the fact, that ipv6 could maybe be in place and active too =
...
so don=B4t forget your ipv6 path and ipv6 dns resolvers...
8) Check your RADB/RIPE/AFRINIC/... routing db entries - if you did
something wrong, maybe you are filtered... (check:
http://irrexplorer.nlnog.net/ and looking glasses)
9) Check that you have your set of IP prefixes in good order and do not
implement strange magic with asymmetric more specifics ... reduce =
everything
to supernetworks on all edges!
10) Check if you are not handing over bgp tagging's which could cause =
some
prevention automatics and check if=20
you do not send high metric values which are maybe causing negative
routing decisions on the other side
11) Think on the fact, that CDN=B4s have the geographic distance as one =
of
their parameters - if the CDN node is too=20
far away from your network - maybe a closer located content box via
transit is rated higher than maybe the long=20
distance via peering (if there is no node or no node with the right
content next to you) ... typically CDN are very close to larger =
IXP=B4s...
12) Think on the fact, that your ip-transit upstream could be a peering =
for
the CDN ... This neutralizes the peering or transit rating
from the point of view of the CDN, but of course not for you ... so: =
talk
with the CDN ... therefore you must be known ...=20
therefore, you should have done a peering session ...
13) Talk with your IXP ... maybe he can help ...
Anything missing here? Anything wrong with my ideas?
(disclaimer: yes, I do work for an IXP ... but this is my personal =
opinion)
happy peering...
Bernd
Bernd Spiess (Manager Peering Service / DE-CIX Management GmbH)
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