Tutorial: BGP Configuration From the IRR

This tutorial introduces the Internet Routing Registry (IRR), the Routing Policy Specification Language (RPSL), and the RtConfig router configuration tool. We explain how to register and query routing policy objects in the IRR. After a brief introduction to routing policies, we discuss RPSL, the language for specifying Internet routing policies in the IRR. We explain several policy examples currently practiced in the Internet and specify them using RPSL. These include as-path prepending, setting preferences and other metrics based on the community attribute, and access lists based on prefix and as-path expressions.

RtConfig is the focus of this tutorial. RtConfig can configure Cisco, Juniper, Nortel, Gated and RSd routers with BGP policies. The amount of configuration it performs is controllable; from simply generating prefix access lists to full-blown router configurations.

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