Transcript Network Service Provider Redundant Transit Providers Customers

Traffic Flows in the Caribbean
Caribbean Internet Forum
Thursday, October 30, 2008
Jonny Martin
Internet Analyst
Packet Clearing House
PCH Background
Not-for-profit agency supporting operation of
critical Internet infrastructure since 1993.
Funded by grants from carriers, equipment
vendors, aid agencies, and individuals.
Offices in San Francisco, London, and
Kathmandu.
Traffic Flows in the Caribbean
Originally going to be joint presentation with Mr.
Carlton Samuels
Unable to obtain full information from carriers
about nature of traffic flows
We’re going to look at a traffic flow that doesn’t
feature in the Caribbean - that across Internet
eXchange Points (IXP)
ISP Lifecycle: Simple Aggregator
Single Transit Provider
ISP Network
Customers
IXPs
ISP Lifecycle: Redundancy and LCR
Redundant Transit Providers
ISP Network
Customers
IXPs
ISP Lifecycle: Local Peer
Redundant Transit Providers
ISP Network
Customers
IXPs
Single IXP
ISP Lifecycle: Network Service Provider
Redundant Transit Providers
NSP Network
Customers
IXPs
Multiple
IXPs
Hot Potato Routing
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Red Customer sends to Green Customer via
Red
NSP
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Red NSP delivers at nearest IXP
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Green NSP backhauls from distant IXP
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Green ISP delivers to Green Customer
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Green Customer replies via Green NSP
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Green NSP delivers at nearest IXP
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Red NSP backhauls from distant IXP
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Red NSP delivers to Red Customer
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Red Network is responsible for its own costs
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Green Network is responsible for its own costs
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
Hot Potato Routing
Symmetry: Fair sharing of costs
Redundant Transit Providers
Redundant Transit Providers
IXP
Red NSP
Network
Green NSP
Network
IXP
Red Customer
Green Customer
The efficiency of the Internet
depends upon this principle:
For any two parties who wish to exchange
traffic, there must be a pair of exchanges,
one near each party.
The manifestation
of this inefficiency:
Countries which haven’t yet built Internet
Exchange Points disadvantage
themselves, and export capital to countries
that already have.
A Closer Look at The Economics
of Internet Exchange Points
Tools for thinking about Internet
Exchanges in economic terms
•What are we, as ISPs, selling?
The right to modulate bits.
That right is a perishable commodity.
Where do we get the potentiallymodulatable bits?
The right to modulate bits
•Any Internet connection is a serial stream
of time-slices.
•Each time-slice can be modulated with a
binary one or zero, one bit.
•Each customer purchases potentially-
modulatable bits at some rate, for
example, 2mbps, which is 5.27 trillion bits
per monthly billing cycle.
That’s a perishable commodity
•The quality (as opposed to quantity-per-time)
characteristics of an Internet connection are
loss, latency, jitter, and out-of-order delivery.
Loss increases as a function of the number and reliability of components in the path, and
the amount of contention for capacity.
Latency increases as a function of distance, and degree of utilization of transmission
buffers by competing traffic sources.
Jitter is the degree of variability in loss and latency, which negatively affects the efficacy
and efficiency of the encoding schemes which mitigate their effects. Jitter increases
relative to the ratio of traffic burstiness to number of sources.
Out-of-order delivery is the portion of packets which arrive later than other, subsequentlytransmitted packets. It increases as a function of the difference in queueing delay on
parallel paths.
•All of these properties become worse with
time and distance, which is a reasonable
So where do we get the bits?
•The value of the Internet is communication.
•The value is produced at the point at which
communication occurs between two ISPs,
and it is transported to the customers who
utilize it.
•Thus, all the bits we sell come from an
Internet exchange, whether nearby, or far
away.
So how do we recognize a
successful exchange?
•The purpose of an IX is to lower
participating ISPs’ average per bit delivery
costs (APBDC).
•A cheap IX is probably a successful one.
An expensive IX is always a failure.
Reliability is just hand-waving by
salespeople.
The irony inherent in that
•An efficient IX is an ISPs lowest-cost
delivery method.
•In order to shift latency-sensitive traffic
toward the lowest-cost delivery method, it
must also be the highest-capacity pipe.
•Regardless of degree of utilization.
•Thus many IX connections run at low
utilization: apparent inefficiency.
So, with that background...
•...let’s take a short tour of the world,
concluding with Latin America.
•As we go, keep an economic perspective,
and consider correlations between
exchange locations and economic power.
Europe
Two Large Exchanges
Many, Many Smaller Exchanges
Cable Landings
North America
Two Large Exchanges
Many Smaller Exchanges
Cable Landings
Asia-Pacific
Three Large Exchanges
Many Medium-Sized Exchanges
Cable Landings
Africa
Two Large IXes
Eight Smaller IXes
Cable Landings
Satellite Only
Latin American & Caribbean Region
Two Large Exchanges
Nine Smaller Exchanges
Three of those are in Brazil
Cable Landings
What about the Mobile Internet?
The majority of mobile applications today are
web applications - formatted nicely for mobiles
Networking considerations for the Mobile
Internet are the same as those for any IP
network
High speed, multi-megabit wireless networks
need large amounts of bandwidth
Mobile Internet and IXPs
IXPs provide cheaper, more efficient, lower
latency paths between networks
IXPs help foster a local community - both
content and providers
Aggregation of demand makes it more attractive
for additional transit providers to enter the
market
Thanks, and Questions?
Copies of this presentation can be found
in Keynote, PDF, QuickTime and PowerPoint formats at:
http:// www.pch.net / resources
Jonny Martin
Internet Analyst
Packet Clearing House
[email protected]