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This presentation looks at the evolution of DC architecture. Initially it discusses the problems our industry has faced and outlines key problem points that persist within the industry. This is then leads the conversation to traditional network architectures and their salvation through CLOS leaf and spine architecture. This foundation serves as the network titan, holding up the overlay's in the DC. Afterwards we look at how the problems aforementioned are solved with Overlay networking.
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The strength of titans building networks that support vertical
growth
Who am I ?
• Enterprise Network
Architect at ESTA 000
• Cisco certified
• Juniper Ambassador and
certified
• Tech Field Day delegate
• blog.ciscoinferno.net @pandom_
• Issues with traditional
networks
• Clos fabrics and spine /
leaf architectures
• Overlay networking
• Issues solved and
takeaways
Topics
–Winston Churchill
“Never has so much been owed by so many to
so few.”
Current challenges
Y U NO
WORK
RIGHT?!?!
Foundations
• Old application tiers
+ FW/LB
• ACLs, Routes,
Subnets, VLANs
• Current campus &
DC
architecture does
not
scale
Services
• Poor time to market
• North South focused topology for
East West applications
• Logical/Physical/Virtual cluster….
Scale
• How many hops?
• Traditional physical problems
• It isn’t all about size
Drivers • Weak business
case
• Poor market
evaluations
• Wrong target
customers
Business culture
• Box huggers
• Old vs New
• Marke-tecture
• Emotional buy in
Can we solve these
problems?
What we
have to
contend
with
Average of 13 hops
How does my network
help me get here?
Clos Fabric
• 1953 - Telecommunications heritage
• Three tier - Ingress, Middle, Egress
• Allows us to build Spine and Leaf topologies.
Spine and Leaf
• 12,000 ports is a good start
• Oversubscription
• Easily expanded
• Trident II
Multistage Clos
• Fixed switches with Trident 2 chipsets - 500ns
• Chassis - 5us between line cards
• 3 stage CLOS is 1.5us
Leveraging a CLOS
fabric
There are products
solving these problems
today
April 2nd
August 26th
September 16th October 29th
November 7th
Thank me
later
Foundations • End to End application smarts
• CLOS/Spine and leaf
• Reduce hair pinning
• In-hypervisor services
Services
• Reduced time to market
• East West application
accommodated
• Virtual everything with
physical egress
Scale
• It is like a fine wine
• Small containers &
Deterministic failure domains
• Size comes with strong base
building blocks
Drivers
• Clear business goals
• Strong understanding of
customers
• Identify opportunity and
deliver value add
• Sweat equity = amazing
• Hulk ‘silo’ Smash
• Lift the veil - dissolve
the marketing
• Involvement and
understanding
Business culture
Takeaways
• CLOS - Leaf spines are a sound and stable underlay
for tunnel fabrics
• Foundation - Services - Scale - Drivers - Culture
ALL play their part.
• NFV and SDN isn’t scary and technology such as
NSX allows you to work more closely with your
networking department and NOT around them.
Questions?
Thank you