Design of Campus Networks

1
Design of Campus Networks
2
Campus Networks

• More than 1000 nodes
• Consist of multiple Mid-Sized networks connected
  through a Core Layer
• Usually distributed over multiple buildings
• Backbone Layer in the mid-sized networks becomes
  the Distribution Layer in the campus network

3
Generic Campus Network
4
Distribution Layer

• Layer 3 switches (or routers) are often used in
  the Distribution Layer
• To restrict broadcasts
• To implement security flexibly
• To route traffic efficiently

5
Core Layer

• Core Layer should be very fast so
• The core should be small, usually each path
  through the core should cross only two switches
• Link aggregation and high speed architectures are
  used in the core
• Multipath routing algorithms are used
• VLANs are used to balance traffic through the
  core

6
Location of Servers
7
Location of Servers

• Local servers are located in a mid-sized network
  module
• Enterprise servers are located in a special
  module connected to the Core Layer called a
  server farm

8
(No Transcript)
9
Simple Campus Network
10
Full-Mesh Core
Good for up to three Buildings. Difficult to add
buildings and to upgrade bandwidth.
11
Partial Mesh Core
Good for networks in which most of the
backbone traffic is between clients and server
farm. Too many hops between clients.
12
Layer 2 Switched Core
Layer 2 switches in core make it easier to
add buildings.
13
Split Layer 2 Core
VLANs create multiple equal cost routes through
the core. Increases throughput and availability.
14
Layer 3 Core
Extremely flexible and scalable design. More
efficient QoS.
15
Layer 3 Core Dual Paths
Dual paths increase availability and throughput.
16
Large Scale Layer 3 Core