I'm running into some issues where our network bandwidth is being completely consumed when any download or upload is happening on the office network. I recently upgraded our bandwidth from 20Mbps down/up (I know, still pretty slow in today's world) from 10Mbps down/up and also replaced our Cisco 1761 & Cisco 2851 routers with two (2) Cisco 2911's to increase WAN/LAN bandwidth.
I just started noticing this recently, but if a download or upload is going on, the network peaks to 20Mbps usage (either down or up) and the entire network crawls until the download/upload is finished. Yesterday, I was downloading a 25MB file at around 2Mbps, and the outbound network literally stopped until my small download completed.
In our ASA 5510, I can watch the bandwidth graph jump from almost no bandwidth usage to max as soon as the download starts and then drops to nothing when it ends.
Any thoughts on this? The Cisco router configs are identical to what they were in the original 1761 and 2851.