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LHCONE VRF Reachability & Transit
Michael O’Connor [email protected]
ESnet
Network Engineering
LHCOPN-LHCONE Meeting – Amsterdam
Science Park – Amsterdam NL
October 28, 2015
LHCONE Global Expansion
• The success of the LHCONE network is driving expansion and growth in Asia, Australia and Central/South America.
• While desirable, expansion and growth will strain the full mesh BGP routing model currently in place.
• On the general Internet, no single provider – no matter how big – connects to all subscribers or to all of the global content.
• To connect it all together (to give all subscribers access to all content), providers must spend money and connect their networks together.
• What options and approaches are available in the research and education networking space to maintain full connectivity among all LHCONE participating institutions?
ESnet LHCONE Full Routing Table Exported only to Sites, ESnet “Transits” the full LHCONE table to it’s customers
Diagram from ESnet perspective of the logical ROUTED connections available to reach all LHCONE collaborating sites.https://twiki.cern.ch/twiki/pub/LHCONE/LhcOneVRF/LHCONE-ESnet-paths.pdf
A discussion on the topic of transit services.
ESnet LHCONE Site RoutesExported to Peers
Internet2
GEANT
NORDUnet
In general transit policies provide protection for NSPs from exploitation by their peers. For instance, ESnet does not share it’s commercial routes with it peer networks, the service is intended to be used only by ESnet customers.
GEANT is a regional transit provider for their customer networks in Europe.
*Networks remaining in full color are ESnet sites
ESnet LHCONE Site Routes Exported to Peers
•ESnet transit policy specifies that this is the only portion of the LHCONE table that we export to peers.
•This is why the principle LHCONE NSPs have established a full mesh of BGP peerings.
Full Mesh LHCONE BGP Routing
GEANT
NORDUNET
I2
ESnet
CANET
Today the principle LHCONE NSPs form a full BGP Mesh, establishing a fully connected network.
Internet2 hosted multipoint BGP exchanges could be considered a form of transit concentrated within in a POP.
GEANT provides LHCONE transit for the RNP network in Brasil
In general, LHCONE NSPs will consider providing transit on a case by case basis
Established point to point or multipoint BGP peering
LHCONE Global Expansion
Geography will strain the LHOCNE fully meshed connectivity model
Example: If KREONET joins LHCONE by connecting to CANET, ESnet and I2 on the US west coast in Seattle WA
Connecting to AsiaKREONET Hypothetical Example
GEANT
NORDUNET
I2
ESnet
KREONET
CANET
What options exist for GEANT, NORDUnet and KREONET to exchange routes?
Connecting to AsiaKREONET Hypothetical Example
NORD
I2
Example: If KREONET joins LHCONE by connecting to CANET, ESnet and I2 on the US west coast in Seattle WA
Maintain Full Mesh by:KREONET establishing a point of presence at an exchange where GEANT and NORDUnet are located, or vice versa.
CANET
ESnet
KREONET
GEANT
Connecting to AsiaKREONET Hypothetical Example
NORD
ESnet
CANET
KREONET
I2
GEANT
Use a Transit NSP:Hypothetically, I2Transit service fills in the gaps left in the partial mesh by exporting the full routing table to KREONET.
•Dedicated transcontinental circuits are no longer required.
•Transit service also provides alternate paths to CANET and ESnet.
Connecting to AsiaHow will this scale?
NORD
ESnet
CANET
KREONET
I2
GEANT
SINET
ARnet
SING-AREN
TWA-REN
Clearly an Asian regional transit service similar to that provided by GEANT in Europe would simplify LHCONE expansion into Asia.
Maintaining LHCONE Reachability Through Measurement
• A new report containing LHCONE BGP Ipv4 and Ipv6 route prefixes.
• JSON format facilitates automated route table comparisons.
twiki.cern.ch/twiki/bin/view/LHCONE/WebHome
Proposal:1. Define an LHCONE route table reporting format.2. Principle NSPs will share LHCONE route tables.3. Table comparison will yield an LHCONE reachability metric,
identifying isolated prefixes.
Summary
• LHCONE success is driving expansion and that is a good thing.
• To manage growth, the community needs to develop:
• Strategies for maintaining LHCONE reachability.
• Policies for mitigating the exploitation risk of transit services.
• What are the transit policies of the principle LHCONE NSPs?
• Are existing transit policies sufficient to support global expansion?
• What technical approaches and tools are required to maintain a fully
connected LHCONE network?
Questions
Michael O’Connor [email protected]
ESnet
Network Engineering
LHCOPN-LHCONE Meeting – Amsterdam
Science Park – Amsterdam NL
October 28, 2015
