https://www.theregister.co.uk/2018/07/17/cisco_aws_analysis/

As we reported yesterday, the idea that Amazon might make its own switches into some kind of a captive gateway between on-premises data centres and the AWS cloud sent shivers through investors in traditional networking vendors – and none so much as Cisco.

Another way of looking at the same announcement is that AWS is entering a market that Cisco has already marked as “end of life”, since in the era of John Chambers' successor Chuck Robbins, a big focus has been Cisco's transition to becoming a software company.