Typical "Slow Network"

[cknox1]

Hi All,

I am working on an apparently slow network for one of our sites - The site consists of 4 x 3650 switches which all have Gigabit speeds, and a Cisco ASA which default traffic is routed to. The ASA's circuit should provide a download speed of around 500mb but the users are seeing just under 100mb for this.... 

I have checked the port settings and as you can imagine all the trunks, user connections are 1000mb full.. So I am struggling to see what is causing this slowness of the network... 

Any help would be great.

Thanks!!!

[cknox1]

Hi Jith,

Thank you for your repsonse. This will need to be doubled checked, but as I said above the engineer conducted a speed test on their own managed router and they achieved a high enough bandwidth 

[Zanthra]

Are you consistently seeing a steady 100Mbps (or slightly lower) speed on the tests? If so, check to make sure that the links are actually reporting being connected at Gigabit speeds. There could be an autonegotiation failure or bad cable dropping a gigabit port down to 100Mbps.

Otherwise, is it possible to connect a test computer directly to the ISP provided router, or directly to your ASA to verify the location of the bottleneck? If you get 500Mbps at the ISP device, and 100Mbps off the ASA, you can definitely rule out an issue with the ISP, and issues with the Network behind the ASA.

[cknox1]

Hi zanthra,

That is the test which I have am looking to have take place, but I am just waiting for a test window to be confirmed. 

After the tests I will update forum