nanog mailing list archives
RE: de-peering and peering
From: "Kris Foster" <Kris.Foster () telus com>
Date: Thu, 4 Apr 2002 12:59:49 -0700
Let us say Network A has a peering Agreement with Network B. Now let us say Network X wants to reach Network B. X and B do not have a peering agreement. Can Network A use the peering Link between A nd B to route the traffic of network X.
If there is an agreement in place (ie. A and B exchanging customer prefixes and X is a customer of A).
What are the mechanisms in place in B's network to detect that Network A is transiting the data( in this case network B looser) from Network X?
You should be able to filter. RADB is one solution that may make it more manageable. But if your not filtering it will still require a transit provider to get the traffic back to X (think asymmetry). Kris
masquerading transit data as if its originating from its own n
Steve Naslund wrote:Peering arrangements are when networks make connectionsbetween each other.Usually networks of equal size (traffic wise) will try to peer with each other.Although thismay not be technically correct here are the basics. Peering - connections between networks that ourcooperative, there is nocost other than the physical connection itself. That cost might be shared or thesmaller network may payfor the physical connection. Carries traffic that terminates on one of the two networks.i.e. you can'tgo through the peering connection you have with my network to get to another network.Consider peeringconnections to be express routes between two networks. You generally can get this type ofconnection if you are aservice provider or public institution. It is harder to get if you are a private entity unless youcan show abenefit for me in peering with you. In other words, I would like the traffic flow to be assymmetric as possible orimprove service for an important customer. Transit - connections between networks that I pay for anallow me to get toanything on the Internet. These are generally very expensive but allow you to reach anyone,anywhere.Consider transit connections to be the superhighway with exits to everywhere but with a lot oftraffic. Anyone whobuys service from an upstream provider has a transit connection although they usuallyrefer to full BGPsessions. Now you can see that if I am paying for a transitconnection through sayUUnet and I have a ton of traffic going to say Exodus, it is in my best interest to try toestablish a peeringagreement with Exodus so that I don't have to use my expensive bandwidth from UUnet. I can also get amore directroute to where my customers want to go and avoid congestion. Peering and de-peering have a huge impact on trafficengineering becauselack of peering means that most traffic is being carried by the biggest transit providers likeUUnet and Cable &Wireless. Peering makes the Internet more redundant and reliable and evens out the loads better. Traffic engineering is all about peering and which paths are preferred over others. I your only connectionsare transit thenthere are not many options for traffic engineering. Steve-----Original Message----- From: owner-nanog () merit edu
[mailto:owner-nanog () merit edu]On Behalf Of
Shashi Kumar Sent: Tuesday, April 02, 2002 12:36 PM To: nanog () merit edu Subject: de-peering and peering Dear List: Sorry for a naive question. Could some one on the list explain what is peering and de-peering ? and how peering and de-peering influence traffic engineering?. ( data traffic or otherwise..) thanks in advance, shashi
Current thread:
- de-peering and peering Shashi Kumar (Apr 02)
- <Possible follow-ups>
- FW: de-peering and peering Steve Naslund (Apr 02)
- Re: de-peering and peering Shashi Kumar (Apr 02)
- Re: de-peering and peering Richard A Steenbergen (Apr 02)
- Re: de-peering and peering Stephane Bortzmeyer (Apr 02)
- RE: de-peering and peering Steve Naslund (Apr 02)
- RE: de-peering and peering Kris Foster (Apr 04)