Quanta Cloud Technology QuantaMesh QNOS5 User Manual

243
9.5. Enhanced Transmission Selection
Enhanced Transmission Selection (ETS) enables the sharing and redistribution of network bandwidth
between various protocols. To support ETS, QNOS software accepts the ETS traffic class group and
bandwidth information Application Priority TLV from auto-upstream devices and propagates it to auto-
downstream devices. QNOS software supports the reception and propagation of ETS information in the
automatic configuration port roles. On QNOS platforms that support hierarchical scheduling, bandwidth
allocation and traffic class groups can be configured by ETS TLVs. Platforms that do not support hierarchical
scheduling do not use the ETS information to configure traffic class groups or bandwidth allocations.
9.5.1. ETS Operation and Dependencies
Using priority-based processing and bandwidth allocations, different Traffic Class Groups (TCGs) within
different types of traffic such as LAN, SAN and Management can be configured to provide bandwidth
allocation or best effort transmit characteristics.
For ETS to be operational, the following dependency the following three configuration steps need to occur:
1. Configure COS queues to Traffic Class Group mapping for the egress ports.
2. Configure weight percentage (bandwidth allocation) for each TCG.
3. Enable appropriate scheduling algorithm for each TCG.
CoS information is exchanged with peer DCBX devices using ETS TLVs. As part of the ETS TLV, by default,
DCBX advertises the following parameters, which are populated on per port basis.
 Mapping between ingress ports 802.1p priority to Traffic Class Group (TCG).
 Bandwidth percentage (weight percentage) of each Traffic Class Group.
 Scheduling algorithm for each Traffic Class Group.
The mapping between the ingress ports 802.1p priority and TCG is not direct. The mapping depends upon:
 The COS map defining the COS queue that a packet is egress forwarded for the ingress 802.1p
priority.
 Traffic Class Group map defining the COS queue to TCG mapping.
The indirect mapping between the 802.1p priorities and the associated TCG mapping is advertised by DCBX as
part of the ETS TLVs. For this indirect mapping to be valid, the following two parameters must be configured
(in addition to the configuration of the TCGs):
1. Configure 8021.p priority to COS mapping for the ingress ports.
2. Enable Trust mode on the ingress ports to trust the 802.1p priority present in the frames.
9.6. VXLAN Gateway Operation and Configuration
9.6.1. Overview

Quanta Cloud Technology QuantaMesh QNOS5 Specifications

General

Brand	Quanta Cloud Technology
Model	QuantaMesh QNOS5
Category	Network Router
Language	English