National Chi Nan University

Multi-Homing Tunnel BrokerMarcelo Bagnulo,

Juan Fco. Rodríguez-Hervella, Alberto García-Martínez,

Arturo Azcorra

Universidad Carlos III de Madrid. Av. Universidad, 30 – Leganés, 28911 Madrid, SPAIN

EUROMICRO 2004: Rennes, France

Speaker: Burgundy Po-kang Chen

National Chi Nan University

Problem Definition

• The wide adoption of RFC 3178 multi-homing solution implies the manual configuration of numerous tunnels on the ISPs, which may impose an important workload in ISP network administrators.

2

National Chi Nan University

Background

• Multi-homing

– Imposing extra stress to the Default Free Zone routing table.

3

National Chi Nan University

Background (cont.)

• End-site prefix aggregation

– Established connections will not be preserved in case of outage.

– Increased connection establishment time in case of failure.– Ingress filtering incompatibility.

4

National Chi Nan University

Background (cont.)

5

National Chi Nan University

Background (cont.)

6

National Chi Nan University

Multi-Homing Tunnel Broker

• We assume that the ISP clients have a commercial relationship with the ISP, so that the ISP can identify its clients and the prefix that the ISP has assigned to them.

7

National Chi Nan University

Multi-Homing Tunnel Broker (cont.)

• TS = Exit Router

8

National Chi Nan University

Multi-Homing Tunnel Broker (cont.)

• TS is a specific router with lower prefix announcing preference.

9

National Chi Nan University

Conclusion

• The Multi-Homing Tunnel Broker has been developed as a proof-of-concept.

10

National Chi Nan University

Reference• Hagino, J. and H. Snyder, "IPv6 Multihoming Support at Site Exit Routers",

RFC 3178, October 2001.• Durand , A., Fasano , P., Guardini , I. and D. Lento, "IPv6 Tunnel Broker",

RFC 3053, January 2001.• T. Bates and Y. Rekhter, "Scalable Support for Multi-homed Multi-provider

Connectivity" , RFC 2260, January 1998.• Cisco Document, BGP Case Studies. [online] Available at: • http://www.cisco.com/en/US/tech/tk365/

technologies_tech_note09186a00800c95bb.shtml#howbgpwork• Wikipedia, Ingress filtering. [online] Available at:

http://en.wikipedia.org/wiki/Ingress_filtering• Wikipedia, Default-free zone. [online] Available at:

http://en.wikipedia.org/wiki/Default-free_zone• Wikipedia, Border Gateway Protocol. [online] Available at:

http://en.wikipedia.org/wiki/Bgp

11