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Leaf-Spine
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Leaf-spine
is a two-layer data center network topology that's useful for data centers
that experience more east-west network traffic than north-south traffic.
Basically, this topology augments the spine-layer with more switches to
handle traffic within the data center. Servers and storage connect to leaf
switches and leaf switches connect to spine switches. Leaf switches mesh into
the spine, forming the access layer that delivers network connection points
for servers. Spine switches have high port density and form the core of the
architecture.
Every leaf
switch in a leaf-spine architecture connects to every switch in the network
fabric. No matter which leaf switch a server is connected to, it has to cross
the same number of devices every time it connects to another server. (The
only exception is when the other server is on the same leaf.) This minimizes
latency and bottlenecks because each payload only has to travel to a spine
switch and another leaf switch to reach its endpoint.
A
leaf-spine topology can be layer 2 or layer 3 depending upon whether the
links between the leaf and spine layer will be switched or routed. In a layer
2 leaf-spine design, Transparent Interconnection of Lots of Links (TRILL) or
shortest path bridging takes the place of spanning-tree. All hosts are linked
to the fabric and offer a loop-free route to their Ethernet MAC address
through a shortest-path-first computation. In a layer 3 design, each link is
routed. This approach is most efficient when virtual local area networks are
sequestered to individual leaf switches or when a network overlay, like
VXLAN, is working.
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