Single flow traffic speed on 10GBps direct connect

Question

Dear Team - As per https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-network-bandwidth.html,

`Baseline bandwidth for single-flow traffic is limited to 5 Gbps when instances are not in the same cluster placement group. `

Does it mean that, we can not send single flow of 10 Gbps from Amazon EC2 instance m5.16xlarge instance that has **64 vCPUs and 20 Gbps network bandwidth** to on-prem server through 10 Gbps of AWS direct connect link ?

What is the single flow supported on 10 Gbps direct connect ?

Thanks,

Leo K · Accepted Answer

Yes, that's what it means. A single flow from an EC2 instance to a Direct Connect can't exceed a sustained level ("baseline bandwidth") of 5 Gbit/s. Bursting above that for a short time when accrued credits are available may or may not be possible, but it doesn't appear to be stated explicitly in public documentation.

Single flow means a network traffic flow identified by the five-tuple consisting of the source IP address, destination IP, protocol number (such as TCP or UDP), source port number (for TCP/UDP), and destination port number. You can send more than 5 Gbit/s from a single EC2 instance of sufficient size through your Direct Connect by using multiple TCP connections in parallel.

Single flow traffic speed on 10GBps direct connect

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