Network diagram software

[ross at kallisti.us (Ross Vandegrift)]

On Wed, Feb 11, 2009 at 02:06:09PM +0100, Mathias Wolkert wrote:
> I'd like to know what software people are using to document networks.
> Visio is obvious but feels like a straight jacket to me.
> I liked netviz but it seems owned by CA and unsupported nowadays.
> 
> What do you use?

I'd like to put a second request.  I often want to very quickly
mock-up a diagram that I'm going to use for myself or for internal
purposes.

Is there any application that takes some kind of *simple* description
and produces a (possibly not so beautiful) picture?  For example, I
might say something like:

	Router(rtr1) connects to vlan 100
	Router(rtr2) connects to Router(rtr1) via T1
	switch(sw1) connects to vlan100
	switch(sw2) connects to Router(rtr2)
	A few hosts connect to Switch(sw1)
	A few hosts connect to Switch(sw2)

-- 
Ross Vandegrift
ross at kallisti.us

"If the fight gets hot, the songs get hotter.  If the going gets tough,
the songs get tougher."
	--Woody Guthrie