In general there are very few bad actors here in regards to trusting/accepting/using DSCP across the internet. Apple has a tendency to mark some traffic with EF that shouldn't be EF on PNIs, and Cogent leaks a lot of their internal markings into customers, but it's generally unmarked traffic from certain customers/peers. Other than that IMHO it's totally valid to accept, and nobody abuses it (other than those 2). We accept DSCP from the internet and do queue a few things higher towards customers for things like OTT VoIP etc. Remarking DSCP is bad IMHO, trusting it is another thing. You just have to be careful, and I suggest good netflow tools to keep an eye on it. On May 5, 2015 5:30 PM, "Ramy Hashish" <ramy.ihashish@gmail.com> wrote:
Good day all,
A simple question, does Internet trust IP DSCP marking? Assume two ASs connected through two tier 1 networks, will the tier one networks trust any DSCP markings done from an AS to the other?
Thanks,
Ramy