1. Bringing External Connectivity and Experimenters to GENI Nick Feamster Georgia Tech

2. Networks Use BGP to Interconnect Route Advertisement Autonomous Systems Session Traffic

3. Virtual Networks Need BGP, Too Strawman –Default routes –Public IP address Problems –Experiments may need to see all upstream routes –Experiments may need more control over traffic Need “BGP” –Setting up individual sessions is cumbersome –…particularly for transient experiments ISP 1 ISP 2 BGP Sessions GENI

4. Solution: BGP Mux Separate BGP view for each upstream ISP Private AS numbers are removed before propagation “local-as” function for client connections Small advertisement interval Unchanged BGP attributes BGP Mux

5. Quagga Configuration: Client Side bgp multiple-instance ! router bgp 64512 view Verio bgp router-id 147.28.7.21 network 168.62.16.0/21 neighbor 147.28.0.4 remote-as 3130 neighbor 147.28.0.4 description PSG0 - Verio neighbor 147.28.0.4 route-map BLOCK out ! router bgp 64512 view Sprint bgp router-id 147.28.0.212 network 168.62.16.0/21 neighbor 147.28.0.1 remote-as 3130 neighbor 147.28.0.1 description Sprint neighbor 147.28.0.1 route-map BLOCK out !

7. Design Requirements Session transparency: BGP updates should appear as they would with direct connection Session stability: Upstreams should not see transient behavior Isolation: Individual networks should be able to set their own policies, forward independently, etc. Scalability: Mux should support many networks

8. Control-Plane Implementation: Quagga Quagga Routing Suite –Open-source BGP daemon –Cisco like CLI support –Used by real ISPs Salient features –Multiple BGP views –Local-AS change –Transparent updates

9. Scaling Problems –Forwarding table size –Forwarding speeds Possible Solutions –Split views across nodes –Hardware-accelerated forwarding (NetFPGA, OpenFlow) AS1 AS2 BGP-Mux Server BGP Instance External IP BGP-View – AS1 BGP-View – AS2 BGP Server

10. Current Status Prefix 168.62.16.0/21 via two locations –Georgia Tech (AS 2637) –PSGNet (AS 3130) BGP routing sessions into OpenVZ containers –ProtoGENI-compatible Current steps –Transition to public AS number and “swip” –VINI integration, Aggregate manager –Deployments: Wisconsin, Utah, Princeton, KDDI –Applications: with Jennifer Rexford and Aki Nakao

11. Whence Measurement? Measuring the Internet with BGP Mux –“Real-time RouteViews” (also, local views) –Subsumes “Beacon” work Opportunity to measure how system would interact with today’s Internet –Today’s network and routing infrastructure –Opportunity to attract real user traffic

12. Summary Virtual networks need upstream connectivity –Transparent to experiments –Stable, from the appearance of the upstream ISP Solution: BGP-Mux –Easy to implement (Quagga config + Tunnelling) –Easy to deploy (please help!) /30 prefix VLAN between Mux and border router Ability to advertise BGP route