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DCA2 Network Infrastructure & Architecture Summary
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Our DCA2 advanced Data & Network Operations Centre (NOC) in Tyson's
Corner, McLean, Virginia is an essential part of our
core
network. The DCA2 NOC is staffed by highly experienced Systems &
Network Administrators 24 hours a day, 365 days a year, and features
multiple heavy-duty UPS (uninterrupted power) systems, multiple diesel
generators, and AC systems.
The local network is arranged in four logical segments:
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Core - redundant Cisco 12012 GSR routers connected to the
Internet and the rest of our national coast-to-coast network via
numerous Gigabit Ethernet lines; running the full BGP4 protocol,
thus ensuring route optimization and redundancy.
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Distribution A - redundant Catalyst 4912G master switches
that ensure a fully redundant switching fabric between the core
routers and the DistB distribution switches.
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Distribution B - redundant high-end Cisco Catalyst 6509 MSFC2
/ Supervisor 2 master routing switches that distribute access to
the physical and virtual LANs and route internal traffic.
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Access - redundantly 2 Gb/s uplink connected Catalyst
2950G-48-EI switches to which all servers are connected. Each
and every server gets a full 100Mb/s full duplex port to the
access layer. 1 Gb/s access ports are also available.
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Our network does not use any 10Mb/s switches, or any hubs - at all.
It is completely Gigabit Ethernet (multiple, redundant 1000 Mb/s for all
network layers) based. Both internal and external network provide
multiple, redundant, paths. Each and every piece of the network is
fully redundant: there is no single point of failure. The network
also includes a number of multi-terabyte tape and RAID-based backup
systems.
Physical Network Infrastructure
Looking Glass Networks, now known as Level 3, one of the most
financially healthy fibre carriers, provides some of private fibre-optics
through multiple OC-192 SONET rings throughout northern Virginia and DC.
In addition, Cox Communications, the nation's third largest cable
service provider, and a very financially solid carrier, provides
additional private fibre-optics through multiple inter-connected OC-192
SONET rings (DWDM capable) throughout northern Virginia and DC.
The multiple, different carrier, OC-192 SONET rings each
consist of two redundant OC-192s traversing two separate paths and
having two diverse routes to our facilities, thus providing the ultimate
in reliability and performance. Even if both of the lines are cut at any
point, the OC-192 ring is still operational, with less than 50 ms (0.05
second) self-healing restoration time.
The multiple private SONET rings provide us the ultimate
in reliability: no downtime even in the case of a major fibre cut in the
area (due to separate paths and multiple fibres).
A number
of other fibre carriers are on site, too: AboveNet (MFN), Verizon, and
MCI/Verizon Business just to name a few.
Furthermore, we do not only connect within Virginia. The DCA2 site has
lines run within northern Virginia, DC and New York. The
directly-connected IAD1, DCA3, NYC1 & NYC2 sites further augment that by
additional Virginia, DC, New York, Illinois, California and Washington
state based connectivity. Due to this fully redundant physical
connectivity -- lines traversing from us in all directions -- ensures
that we will remain up and running even in case of a major disaster in
the area.
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Further Advantages of Our Network
The northern
Virginia area is an ideal location for a Data Centre. A very large portion of
the world's Internet traffic passes through here, and the area is not subject to
earthquakes, tornadoes, floods or other natural disasters.
We are located at
the true heart of the Internet, and in a very safe and secure area. This central
location ensures optimal connectivity, speed, and routing, minimizing the number
of hops - and thus the chance of any problems. We are located right beside a
great number of private and public peering points, in one of the most densely
and best connected areas in the world, including directly peering at the Equinix
Exchanges (IBX'es) in Ashburn, Virginia and Chicago, Illinois, at the NYIIX in
NYC, New York, at PAIX in Palo Alto, CA and Seattle, WA, at the SIX in Seattle,
WA, and at Any2 in both Los Angeles, CA and San Jose, CA. All providers have
multiple, redundant routes into the DC/VA area. This is further built upon by
our redundant connectivity to multiple Tier 1 providers via separate circuits,
terminating at diverse locations in Virginia and the District of Columbia. We
are redundantly set-up Internet connectivity wise (multiple backbone
connectivity providers), as well as physically. In terms of fibre optics, we
have multiple private OC-192 SONET rings with multiple financially-healthy fibre
providers, taking different physical paths.
We have built our
facilities in the best possible area for Internet connectivity, and then further
reinforced it with redundancy in all possible forms. We operate three
high-capacity UPS systems: one APC system and two Liebert systems, the three UPS
systems together being able to power all the DCA2 servers for over 30 minutes in
case of a power outage. In case of a more extensive outage, the two (three
engines total) diesel power generators - that can run indefinitely, if need be -
would kick into effect. Multiple 15 through 30 ton Liebert AC units - over 300
tons all together - are in use, too, maintaining a consistent temperature of 18C
and a dust-free environment at our Data Centre.
One of the most
unique features of our DCA2 DC is its US military / NSA (National Security
Agency) standard compliant "tempest room." Any customer servers located in this
room (upon request) will be fully secure from eletrical or magnetic
interference, as well as safe upon a physical attack on the facilities. The
"tempest room" is similar to a bank vault, except that it has been built and
designed to be used for physically secure server hosting specifically.
To ensure the
best routing of our customers' data, we pay for commercial top-priority transit
network capacity to our tier 1 backbone providers and have full burst capacity
available at all times on all circuits. Thus we receive the highest level of
service, including 99.99% or 100% uptime and no packet-loss guarantees, from all
our connectivity providers. 90%+ of traffic from us to end users only passes
over one or two backbones on its way to reaching the end destination. In
addition, we are committed to under 50% network capacity utilization at all
times; we ensure that our network always has double the capacity it needs, even
at peak hours.
Our network
design and operations ensure the very best connectivity, speed, and reliability
possible: 100% network uptime, no packet loss, and under 3 ms low latency
connection to Tier 1 backbones -