Peering BOF – Peering Personal NANOG 25 Richmond Hill, CA June 10, 2002.
Peering Policy
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Peering Policies
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- The Internet - Interconnections: transit and peering - Internet Peering Ecosystem - Ecosystem members - The Internet view
- Why peer? - Lower transit costs - Lower latency - Usage-based traffic billing - Marketing benefits - The benefit of peering
- Internet eXchange Point - The role of an IXP - Common IXP features - Public and private peering - European IXPs: Big IXPs, participants, traffic exchanged - Nautilus Mediterranean eXchange point
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- Internet Exchange point selection criteria
- Transit VS Peering - Definitions - Cost of traffic in a transit relationship - Cost of traffic in a peering relationship
- Peering policies
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The Internet: is a network of networks, interconnected in peering and transit relationships referred to as a Global Internet Peering Ecosystem
- Ases are Identified by unique AS numbers
- Ases can host IP resources on their network (web, mail, news, services)
- Ases can have customers to whom they give connectivity
- Ases interconnect with each other establishing routing paths to resources
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Internet Transit: is the business relationship whereby one ISP provides (usually sells) access to all destinations in its routing table
- Isp sells access to Internet, so….
- An Isp must itself get attached to an Isp already attached to the Internet
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Internet Peering: is the business relationship whereby companies reciprocally provide access to each others’ customers
Peering is a non-transitive relationship
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The Global Internet Peering Ecosystem: consists of a set of Internet Regions that operate an Internet Peering
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A Regional Tier 1 ISP (Transit Free) is an ISP that has access to the entire Internet Region Routing Table solely through Peering Relationship
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A Tier 2 ISP is an ISP that has to purchase Transit to access some part of the Internet Region
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A Content Provider focuses on content development and does not Sell access to the Internet
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1) Lower transit costs
2) Lower latency
3) Usage-based traffic billing
4) Marketing benefits
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- Customer traffic need to traverse a couple of Transit Providers and accross great distances (high latency) before reaching other customer
- Through direct peering interconnections ISP customers realize better performance
- Keeping local traffic local
- Processing delay
- Queuing delay
- Transmission delay
- Propagation delay
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- Some ISPs charge customers based upon metered traffic
- Packet loss and latency slows traffic consumption
- It is in their best interest therefore to assure that customers use as much bandwidth as possible by minimizing loss and latency through effective traffic engineering
Marketing benefits
- Some ISP pointed to the benefits of a network diagram rich in interconnections as a proxy for quality as seen by customer prospects
Usage-based traffic billing
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- Peering is a mutual agreement between peers, no entity is considered superior
- Round trip times are dramatically reduced
- Local communications are improved
- Peering is often for free
- Overall Internet reliability and robustness is highly improved
Direct peering introduces some benefits over a total hyerarchically tiered organization:
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- We can see the Internet as an interconnection of networks (or AS, Autonomous Systems)
- Every single ISP has its own set of networks (an AS) and “buys” access to the “Big Internet” from upstream providers (larger ISPs), in a sort of tree-hierarchy
- Without IXPs traffic between two ISPs (leaf nodes) would flow up and down through the hierarchy of upstream providers (slow and expensive)
- By connecting to an IXP, ISPs can exchange inter-traffic, via BGP peering sessions, at a lower cost and better performance
- IXPs have a crucial role in making the whole network infrastructure more fast and reliable
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- Wide choice of WAN fiber optics access carriers
- High-performance switching (Layer-2) devices
- Hosting space for ISPs network devices (mainly routers), structured cabling, reduntant power supplies
- Additional services: monitoring and alarms, traffic and bandwidth statistics, redundant access
- human peering: meetings and events to promote human relationships between network operators (both admins and techies)
- NO REDUNDANCY !!
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Public Peering is Internet Peering accross a shared peering fabric
Private Peering is Internet Peering accross transport with exactly two parties connected to it, usually a fiber cross connect or point to point circuit
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- Aggregation benefit
- Easy of administration
- Public peering is used as a selection criteria by customers
- Public peering may be the only cost effective way to peer accross multiple colos
- Private Peering Sessions are easy to monitor
- Private peering is very cost effective
- Private peering is more reliable and easy to debug
- Private peering sessions are more Secure
Public Peering Private Peering
Hybrid Approach: public + private peering
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What ?
Route Servers (RS) provide support for the establishment of peering arrangements between IXP peers: theoretically, a single peering session replaces a complex full mesh BGP interconnection
How ?
- Each peer establishes a single BGP peering session with the RS, advertising its own prefixes
- RS performs per-peer RIB calculation, applying input/output filter to overall received prefixes
- RS announces each peer a set of prefixes resulting from the previous RIB calculation
- RS is not involved in packet forwarding !
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Country # IXPs Russia 14 Sweden 12 germany 11 france 10 U.K. 7 Norway 7 Italy 7 Netherlands 7 Ukraine 5 Finland 4
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Total IXP participants
Unique ASNs
Present at > one IXP
Europe 5.264 3.103 902
Asia-Pac 1.112 643 213
N. America 2.045 840 306
S. America 313 186 49
Africa 201 113 3
Global 9.295 4.614 1.387
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Participant ANS # of IXP EUR IXPs Google 15169 51 21
Akamai 20940 45 20
Limelight 22822 40 10
Hurricane 6939 36 14
Yahoo! 10310 28 5
Tata 6453 25 11
BroadbandONE 19151 25 3
Mzima 25937 24 2
E4A 34695 23 19
Easynet 4589 23 15
Verisign 26415 23 12
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AMS-IX (Amsterdam Internet Exchange)
- Number of members: 369 - Number of sites: 7
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AMS-IX infrastructure
- AMS-IX is a distributed exchange, currently present at multiple independent co-location facilities in Amsterdam
- Each site is equipped with one or more access devices to enable connections to the AMS-IX infrastructure
- The current implementation of the AMS-IX peering platform uses an MPLS/VPLS infrastructure
- Members connect with either Gigabit Ethernet (GE), 10Gigabit Ethernet (10GE) or multiples of these on the access devices
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LINX (London Internet Exchange)
- Number of members: 365 - Number of sites: 10 - Number of networks exchanged: 265.288
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LINX infrastructure
- The LINX Network consists of two separate high-performance Ethernet switching platforms installed across ten locations.
- Switches from different equipment vendors are deployed in two diverse networks to provide an extra level of fault-tolerance, the logic being that both systems shouldn't develop the same fault at the same time.
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DE-CIX (German Internet Exchange)
- Number of members: 360 - Number of sites: 13
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De-CIX infrastructure
1) Access Switches 2) 160 Gbps DWDM Systems & fiber protection devices 3) Dark fiber backbone 4) Backup dark fiber backbone 5) Production and backup core switches
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- Neutral, member-based, not-for-profit IXP based in Rome
- Founded in 1995, established as a consortium in 2001
- Counting 38 members - Larrge National ISPs and carriers - Local IDPs and content providers (Akamai) - International carriers (TATA, Telefonica, Cogent,
Interoute, GBLX, ...) - Research network - http://www.namex.it/en/who/members
- Two main service categories - Peering and other IP services - Carrier interconnection services (physical)
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- Up to 12Gbps of exchanged traffic in the last year
- Member of Euro-IX association
- R&D partnerships with Roma 3 University and CNR
- Hosting Italian Public Administration Qualied Exchange Network (QXN)
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Double star with high capacity switching fabrics in the middle, routers around. Stars are physically and logically separated for redundancy and robustness.
- Primary LAN: Enterasys
- Secondary LAN: Cisco 6509-E
- Vendor differentiation to enhance robustness against bugs and specific attack
- Core business is mostly at Level 2 of ISO/OSI model
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Public and private peering, transit VLANs:
- Redundant high-end switching platform
- Members peering on public VLANs via BGPv4
- Private peerings and transit on dedicated VLANs
- IPv4/IPv6 support
- ~12 Gbps aggregated traffic
- Info: http://www.namex.it/en/services/publicpeering
Additional services:
- Global DNS: F-root and J-root name servers anycast replicas
- AS112
- Route Servers
- iBGPlay: monitoring of BGP paths and reachability in real time
- Meeting/Workshop
- Info: http://www.namex.it/en/services/additional
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Housing and power supply for carrier equipments:
- Full or partial rack housing
- Redundant AC power
- Cooling, monitoring, 24x7 access
Meet-me-room for cross-connection
Highest carrier and fiber density in town!
The “grey” Internet:
- Transits, transports, geographic links, dark fibers
- Multiple layers: both physical and logical
- Only physical demarcation is evident
- Traffic volumes much higher than peering
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1) Telecommunications access issues
- How fast can circuits be brought into the interconnection environment?
- How many carriers compete for business for circuits back to my local Point of Presence (POP)?
- Are there nearby fiber providers?
- How fast can my peer and I get connectivity into the exchange?
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2) Deployment issues
- How do I get my equipment into the exchange?
- Do I ship equipment in or do I have to bring it with me as I fly in?
- Will someone act as remote hands and eyes to get the equipment into the racks or do I do the installation myself?
- what are the costs associated with deployment (travel, staff time, etc.) into this exchange?
- Does the exchange have sufficient space, power, air conditioning, etc.
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3) ISP Current Presences issues
- Number of participant ?
- Number of interesting participant ?
- ........
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4) Operations issues
- Does the exchange allow private network interconnections?
- Are there requirements to connect to a central switch?
- How is access and security handled at the facility ?
- Is there sufficient power, HVAC, capacity at the switch, space for additional racks, real time staff support ?
- Is it easy to upgrade my presence over time?
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5) Cost issues
- What is the cost and value of this IXP ?
- What are the rack fees, cross connect fees, port fees, installation fees?
- What are the future operating fees going to be?
- What are the motivations and parameters surrounding these fees?
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Internet Transit: is the business relationship whereby one ISP provides (usually sells) access to all destinations in its routing table
Internet Peering: is the business relationship whereby companies reciprocally provide access to each others’ customers
Transit is simple: Internet this way
Peering is a non-transitive relationship
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Internet transit billing Internet peering billing
- Transport of the traffic into the exchange point
- Colocation space
- Equipment
- A port on the exchange point shared fabric
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- Internet Transit Price Declines
- Internet traffic volumes have always grown
When does it make sense to Peer?
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ISP goals
- ISPs seek peering primarily to reduce transit costs and improve performance (lower latency)
- get peering set up as soon as possible
- minimize the cost of the interconnection and their transit costs
- maximize the benefits of a systematic approach to peering - selection of exchange environment - identification of potential peers - identification (ideally) of traffic eXchanged
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A Peering Inclination is a predisposition towards or against peering as demonstrated by Peering behavior in a Peering Ecosystem
A Peering Policy is an articulation of the Peering Inclination;
There are three general classes of Peering Inclinations seen in the Peering Ecosystem
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Open: entity will generally agree to peer with anyone (no prerequisites)
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Selective: entity will generally peer but there are some prerequisites
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Restrictive: the entity is generally not open to new peering
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Finally, the peering networks reaches the plateu of the "tier 1" network
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Thanks
Flavio Luciani
E-mail: [email protected] Web: www.namex.it