North American Network Operators Group
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Re: Transit LAN vs. Individual LANs

  • From: Stephen Sprunk
  • Date: Tue Feb 28 20:24:59 2006 
Thus spake "Ejay Hire" <[email protected]>

From my perspective...
...a physical mesh requires too many ports to be economical.
But, if one has the money, it's probably the better technical choice. Since his folks are already familiar with having things set up PTP using some other physical layer, that also reduces the odds of human error.

...a logical mesh has a couple of things against it.  It
requires a lot of configuration, and each router will be
connected with a trunk interface, (on the antique switches
I've worked with) every trunk will carry all the traffic in
the switch, your maximum bandwidth across the whole switch
is 1gbps, instead of the next option which gives you more
bandwidth across the switch.
Not true, unless you're using some antique switching gear. Assuming all traffic is up/downstream and not sideways, you can get 4Gb/s in each direction (two CRs connected to two switches each). Whether you break that into PTP VLANs or shared VLANs shouldn't affect anything.

[ Note that this is moot since the OP responded he's running a physical mesh ]

S

Stephen Sprunk "Stupid people surround themselves with smart
CCIE #3723 people. Smart people surround themselves with
K5SSS smart people who disagree with them." --Aaron Sorkin