The Zebra Distributed routing software

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Presentation transcript:

The Zebra Distributed routing software Kunihiro Ishiguro Digital Magic Labs, Inc.

What’s Zebra ? Zebra is a distributed multi-server multi-thread routing software. Zebra is a free software distributed under GPL. Modularity,extensibility,maintainability It provides user level packet forwarding table when working with GNU Hurd.

Why do we need yet another routing software? Routed Gated MRT Vender development software…..

New world with zebra One process per one protocol kernel routing table update and redistribution between different protocols are provided by zebra daemon Other daemons are for protocol handling Easy to add a new protocol daemon BGP route server and route reflector are integrated into BGPd

Zebra architecture BGPd RIPd OSPFd zebra UNIX Kernel

Benefits of multiple server It increases modularity, extensibility, maintainability It allows incremental development of a protocol daemon Easy to add a new protocol without changing other source codes Often easy to debug

Multiple servers can be slow Inter process communication V.S. intra process communication kernel routing table updates and redistribution would be slow Authentication problem

Zebra architecture on GNU Hurd lookup zebra BGPd RIPd OSPFd pfinet answer Mach Kernel

Benefits of user level routing table Source IP Address (and destination) based policy routing per interface routing table and much more ideas…. R Segment 1 Segment 2

zebra daemon Wrapping service around interfaces Kernel routing table updates Redistribute routing information between different protocols

Zebra API ZEBRA_ROUTE_ADD ZEBRA_ROUTE_DELTE ZEBRA_ROUTE_LOOKUP ZEBRA_INTERFACE_ALL …

RIPd RIP Version1, 2 RIPng supports

BGPd BPG-4 Route server Route reflector Route flap dampening

OSPFd and other It’s time to develop other protocols

Problems Authentication Performance Each daemon has their own terminal interface and configuration file

Current status zebra(for *BSD),RIPd,BGPd(dump only) works Zebra ML <zebra@digital-magic.co.jp> for subscription please write to <zebra-request@digital-magic.co.jp> Zebra Home Page http://zebra.digital-magic.co.jp/