Ieee 802.1Q Tag Based Cos; Ieee 802.1Q Type Of Service For Ipv4 /Ipv6 Packet - Comtrol RocketLinx ES8108 User Manual

Introduction

IEEE 802.1Q tag based CoS

The RocketLinx ES8108/ES8108F checks the 3 bits of the priority field carried by a VLAN tag and maps it to the
corresponding priority. A packet with a priority field ranging from 0 to 3 will be treated as a low priority packet, and will be
stored in a low priority queue. A packet with a priority field ranging from 4 to 7 will be treated as a high priority packet, and
will be stored in the high priority queue.

IEEE 802.1Q Type of Service for IPv4 /IPv6 packet

The RocketLinx ES8108/ES8108F also provides the IP layer CoS (Class of Service) function by recognizing the priority octet
and mapping it to the corresponding priority. For an IPv4 packet, it is embedded in the TOS (Type of Service) Octet.
IPv4 Frame Format
RocketLinx ES8108/ES8108F User Guide: 2000514 Rev. B - 9
IEEE 802.1Q tag based CoS