I recently managed to migrate everything (200 racks) on a VSS cluster. At the moment all the racks except 1, are running only on one link, connected to switch 1 - Active switch.
I provisioned a new rack, and after the migration was completed, this is the first rack that I wanted to connecct to the VSS cluster, using both links.
When I connected the cable to switch 1, it generated a spike of 100 to 400 mbps, to all the other edge switches (non cisco) connected to switch 1. This spike lasted for 1 to 2 minutes, and then everything went back to normal. I included the rrd graph below.
I am really surprised that this happened, as the edge switch is configured with a port -channel, and the MEC is configured correctly as well.
Any-one else experienced the same issue?