Hi all, I’m beginning work on a feature to enable DSCP marking for traffic between the mid and edge cache. So far the high level proposed design is:
1. DSCP marking from Mid to Edge will be configurable on a per-DS basis (like DSCP marking from Edge to Client is today). This means the Mids will need to know what DS a particular request corresponds to (we have a use case for two DSes pointing to the same origin) 2. Therefore, the Edge will need to write a new header (Forwarded:host= as per RFC 7239<https://tools.ietf.org/html/rfc7239>) into the request that is sent up to the Mid 3. The Mid will use a remap rule (like the Edge does today) to apply a DSCP config to responses where the request has a matching Forwarded header 4. To accomplish this, Traffic Ops will need to generate header rewrite rules on the Edge and remap.config on the Mid to match this configuration scheme Any issues or improvements to this? Or will this work? Thanks, Mike Sandman
