showstack / glossary / qos
QoS (quality of service) 服務品質
Marking packets so a switch knows which ones to send first when a link is congested. On a media network the clock is marked highest, the media next, and everything else takes what is left.
中文
為封包標記優先權，讓交換器在鏈路壅塞時知道該先送哪些。在媒體網路上，時脈封包優先權最高，媒體次之，其餘流量分配剩餘頻寬。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | QoS | |
| HK / TW | QoS / 服務品質 |
Easy to get wrong
DSCP is layer 3, PCP is layer 2 inside the VLAN tag. An untagged access port has no PCP, so half the QoS a vendor guide describes silently does not exist on that port.
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Where it shows up on the wire
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Sources
- IEEE 802.1Q priority code point — IEEE primary
Understand the mechanism
Something wrong, or missing?
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