de-peering and peering

Tue Apr 2 19:39:52 UTC 2002

Steve:

  Thanks for the reply. But when doing a traffic engineering i have the 
following problem. Consider the scenario.

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.

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?

Basically what I am trying to arrive at is: Suppose the peering 
arrangement between A and B were to be for data originating from A and B 
only(and not transited). Can A or B misuse the peering agreement by 
masquerading transit data as if its originating from its own n/w?

thx,
shashi

Steve Naslund wrote:

> Peering arrangements are when networks make connections between each other.
> Usually networks of
> equal size (traffic wise) will try to peer with each other.  Although this
> may not be technically correct here
> are the basics.
> 
> Peering - connections between networks that our cooperative, there is no
> cost other than the physical
> connection itself.  That cost might be shared or the smaller network may pay
> for the physical connection.
> Carries traffic that terminates on one of the two networks.  i.e. you can't
> go through the peering connection
> you have with my network to get to another network.  Consider peering
> connections to be express routes between
> two networks.  You generally can get this type of connection if you are a
> service provider or public institution.
> It is harder to get if you are a private entity unless you can show a
> benefit for me in peering with you.  In
> other words, I would like the traffic flow to be as symmetric as possible or
> improve service for an important
> customer.
> 
> Transit - connections between networks that I pay for an allow me to get to
> anything 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 of traffic.  Anyone who
> buys service from an upstream
> provider has a transit connection although they usually refer to full BGP
> sessions.
> 
> Now you can see that if I am paying for a transit connection through say
> UUnet and I have a ton of traffic going
> to say Exodus, it is in my best interest to try to establish a peering
> agreement with Exodus so that I don't have
> to use my expensive bandwidth from UUnet.  I can also get a more direct
> route to where my customers want to go and
> avoid congestion.
> 
> Peering and de-peering have a huge impact on traffic engineering because
> lack of peering means that most traffic
> is being carried by the biggest transit providers like UUnet 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 connections are transit then
> there are not many options for
> traffic engineering.
> 
> Steve
> 
> 
>>-----Original Message-----
>>From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu]On Behalf Of
>>Shashi Kumar
>>Sent: Tuesday, April 02, 2002 12:36 PM
>>To: nanog at 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
>>
>>
>>
> 
> 

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