[138872] in North American Network Operators' Group
DWDM Metro Access Design
daemon@ATHENA.MIT.EDU (Livio Zanol Puppim)
Mon Mar 21 20:37:11 2011
Date: Mon, 21 Mar 2011 21:36:20 -0300
From: Livio Zanol Puppim <livio.zanol.puppim@gmail.com>
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hello,
I don't know if this is the appropriate list for this kind of subject, so i=
f
anyone knows another specific list, please tell me...
I'm analysing several DWDM designs to implement at my city, but I'm still a
bit confusing about the Metro acess design. I'm supposed to build a physica=
l
ring topology with 6 pairs of fiber with an hub-and-spoke logical topology.
The ring will have about 40Km. At the HUB we'll install our
point-of-presence with a MPLS equipment, and at the spokes we'll use only I=
P
routers. We need an flexible design where we can add or remove spokes as
needed with the minimum effort possible. We are planning to have, at a
initial deployment, about 200 hundred spokes, and all these spokes are
talking only with the HUB site. Everything should work like in an FTTH or
FTTB design, no other type of transportation is allowed (wireless and
copper).
We can't use SONET/SDH. The solution must be only IPoDWDM or complemented
with TDMoIP at the access equipment.
The problem, is that all documents that I'm reading specifies that we shoul=
d
be worried with faults scenarios at the spokes, so that the optical network
does not stops. For example, if the OADM equipment at the spoke is down, th=
e
lambda dropped at that site will be down too... Or at least, if we use a lo=
t
of lambdas, we need to keep and eye at the points where we have
regenerators.
We need bandwidth from 10Mbps to 1000Mbps at these spokes.
My question is:
Is it possible to make such a network in a way that we don't need to worry
about faults (electrical or others) at the spokes? If so, how can I do this=
?
I don't want the spokes sites interfering directly at the operation for the
whole network.
Thanks for your help.
--=20
[]'s
L=EDvio Zanol Puppim
