Slow network / broadcast

[mark_bayliss_2]

Hi all,

Our network feels slow and trying to find the best way to investigate this properly. We have Cisco chassis 4500 with mix of 3560/2950 Edge switches 1GB backbones and WLC/WCS in place. The network is broken into multiple VLANS and IOS on our switches haven't been updated in 3-4 years.

On a wireless laptop (G) with get throughput of 1-2MB/s transfer speed with usually 10 clients per AP and LAN we get anywhere between 7-15 MB/s transfer. Using wireshark on a wireless laptop we see alot broadcast traffic from other clients and the same for LAN.

What is the best way to troubleshoot performance issues on the network and where do I start?

Any pointers would be appreciated.

Mark

[Ton V Engelen]

Hi, kinda hard, as there is no topology or config output.

I d try and check a couple of things.

- how big are the subnets? ( as you see a lot of broadcast traffic)

- do you see a lot of drops on certain up- and downlinks?

- check if your backbone links really operate at 1Gb

- cpu issues?

- are there any (known) issues with the old ios firmware? (as there have been no updates in 4 years)