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Emulab's Current Support For IXPs: An example of support for non-PCs 1 IXPs • May be a good model for handling motes and other special hardware • Intel's network processors • StrongARM chip that runs Linux • Hosted as a PCI card in a PC • Serial line for control – We attach it to the host PC • Impoverished environment – We do configuration from the outside 2 IXP Integration in Emulab In two ways: • Available to remote researchers – Same ease of use and automatic setup of other Emulab resources, now extended to the IXP – Can be configured in an arbitrary network topology with end-nodes and routers, to experiment with and evaluate an IXP-based application • As transparent high capacity link-emulators 3 Challenges • Issue: an IXP is not 1 computer, it’s several! – – – – Host PC StrongArm Microengines Microcode development box? Local or remote? • Add a “sub-node” notion throughout Emulab • Both IXP and its host are first-class entities – PC can be implicitly allocated and associated to IXP – User gets handles on both so can manipulate them, e.g., load custom image 4 How Emulab Handles IXPs • Hierarchical nodes – IXP is a 'subnode' of its host – Each can have its own links – Each can be manipulated separately in NS file – Mapper understands subnode relationshipts • Bootstrap over the serial line • Do configuration of Linux over the serial line • Generate config for reference router app 5 Demo Topology HOST PC Control interface link SRC link DST IXP1200 CARD 6 Features • Routes, interface configuration generated by Emulab • Routable IP addresses assigned to the control interface between the host and the IXP • Project directories mounted on the card from emulab file server, IXP SDK directory mounted from the host • Hosts, name server files mounted on the card. 7 More Features… • Automatic booting and setup of the card • Serial console, power controller access • Support for a startup command on the IXP: enables download of custom application to the microengines. For example: tb-start /proj/foo/myapp /proj/foo/config • Support for Windows development environment coming 8