de-peering and peering

Thu Apr 4 19:59:49 UTC 2002

> 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 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
>>
>>
>>
> 
> 