Linksys routers and Visio replacement

[dracus at speakeasy.net (dracus at speakeasy.net)]

Greetings, all

Let us see if this works this time....

To help with a major re-organization of one of the datacenters of my
employer, I would like to map the current and running configuration of
the site.  So I would like a Visio replacement for Linux, if anyone
knows of one.  I need to move, add, remove, reconnect, etc servers,
switches, and routers on the fly.  As this is a site with a few
hundred servers, it is a non-trivial task.  Any pointers would be
greatly appreciated.

Also, I am wanting to get up to speed on BGP.  Since I can not afford
to buy a rack or two of Cisco routers, I would like to use the Linksys,
or similar, home gateway routers to build a test network with.  There
would only be a system or two on the network, it is just to figure out
BGP routing.  Does anyone have any of the Linksys routers capable of
running Linux available?  Or is there a better place then Craigslist
to pick them up used?

Thanks.

Hunter