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Create numerous BGP sources with a single router

Sometimes you need numerous BGP sources in your lab, but have only a fixed number of routers. Although you could introduce an extra BGP source with Quagga running on Linux (or use tricks to generate more than one BGP source on a single Linux host), it’s usually best if you could avoid the introduction of extra devices in your lab.

Recent releases of Cisco IOS provide a perfect solution: you can run as many BGP instances as you wish on a single router (each one in its own VRF) and use the BGP Support for Dual-AS Configuration to replace actual AS number with the desired one.

Read the whole article in the CT3 wiki

4 comments:

  1. Hi,

    IIRC what you can't do (and which was what I needed ofcourse), was to replace the router's AS num, with that of the peer's. i.e. fake iBGP peering with peer instead of eBGP. shame...

    /Pete
  2. Your memory is perfect. Quagga to the rescue :)
  3. Hello Ivan,

    Many Cisco docs mention ROUTEM as a BGP speaker and/or client simulator. Do you have more info about it? How is it available?

    Thanks, Jon
  4. @Jon: I have no information on ROUTEM. It could be an internal testing tool, but I don't see a great need for it (apart from stress testing, but if you're interested in that, you could easily write your own BGP source in PERL).
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