On 25/05/12 10:21, Jay Daley wrote:
Forgive me if I'm being a bit thick but some questions spring from that:
- By high priortity/low priority tagging do you mean at layer 3 IP (expedited forwarding in diffserv?) or layer 2?
- If a home router were to tag all egress traffic as high priority then would it work the way you say it wouldn't above - i.e. the first 2.5Mb/s guaranteed and the rest entering into contention.
- And would that high priority tagged traffic then win out over low priority traffic in that contention?
The LFC makes the distinction based on PCP bits, using PCP 4 to identify "Discard Ineligible" frames. If there's >CIR being sent, and the link is hitting congestion, then frames not marked, or marked with a different value, will be dropped first. If the the RSP or CPE don't mark any frames as discard ineligible, then the LFC can drop any frame it feels like. There's some good reading here: http://www.chorus.co.nz/ufbservices Specifically the base residential service description: http://www.chorus.co.nz/file/2007/chorus-ufb-services-agreement-service-desc...