Category Archives: Network Diagram

Single Rack SDN Environment

Attached is a PDF of a visio diagram of the single rack layout.

A couple of things about the diagram-

One blade per chassis is on the 10G “control network” – A1 and B1 to be used as controllers\ and C1 as the monitor/SNMP poller.

The blade chassis are connected via 1G to the control network as well (console/ssh access)

Initial configuration will not connect the data networks to the production network

Later testing needs to be done to run load over the OpenFlow VRF

In addition to our current ongoing activity around load testing (both traffic and rules) we need to start work on testing the general use cases.

Use Case #1 – Expressway #1

  • Normal traffic will flow over the A links between switches
  • Traffic from A2 to B2 will be routed over the B link between switch #1 and switch #2

This  will require a fairly simple rule – but it could be based on MAC address, source/dest IP, port, …

I think we should load up traffic on the A link and then show that we can independently load up traffic on the B path.  We should also plan to put rule set updates/stress on the servers as well.

Use Case #2 – Expressway #2A

This is similar to above but traffic has to flow through two switches

  • Traffic from A2 to C2 will flow over the B paths

Use Case #3 – Expressway #2B

This is similar to #1 – but the path is between switch #1 and switch #3 and bypasses switch #2

  • Traffic from A2 to C2 will flow over the C path

Visio-SDN Use Case Mapping – Single Rack – 12-04-13

perfSONAR Test Results – 10/28/13 to 10/31/13

Jianan Wang ran a series of perfSONAR runs that included runs that overlapped their timing and runs that were done with no overlap.

The three blade chassis, each containing four blade servers, are connected to three independent OpenFlow switches.

Connections between blades SDN09/SDN10/SDN11/SDN12 to SDN05/SDN06/SDN07/SDN08 traverse two OpenFlow switches

Connections between blades SDN09/SDN10/SDN11/SDN12 to SDN01/SDN02/SDN03/SDN04 traverse three OpenFlow switches

As expected, the runs with no overlap showed approximately 9 Gbps of available bandwidth for traffic that ran through two switches, while the runs that overlapped (across three servers) showed approximately 3 Gbps of available bandwidth

A reduction of 1 Gbps was seen in traffic that flowed across the additional switch for the unblocked test.

SDN09 Rates

As a reminder, here is an overview of the server topology

SDN Topology Image

Here is a shorter time window that shows the variation between blocking and non-blocking perfSONAR tests (note that this is for SDN10 connections to SDN01 and SDN05).

SDN10 Rates

SDN Network Layout

Below is a depiction of the network prior to the implementation of the Open Flow switches.  Connectivity between NB154 (IGSP gear in North Building Data Center Space) and NB 145 (DSCR) flows through the core network on the openflow VRF.

SDN Network Layout – Pre Open Flow – SDN Network Layout – Pre Open Flow – DF

After the base testing is completed, the network will be updated as shown in the attached:

SDN Network Layout – Post Open Flow