Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
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22.1.1.16 QoS
QoS by default is enabled on all NNI interfaces. Depending on the switch, QoS may still have to be enabled
on the UNI interface or filters must be used to provide end-to-end QoS.
On the VSP 4000, VSP 8000, VSP 7200, and VSP 9000, the interface level parameters 802.1p-override
disable, enable-diffserv enable and no access-diffserv enable are the default settings. On an UNI interface,
this has the overall result of honoring p-bits for bridge traffic and DSCP values for routed traffic. Note that
on the ERS 8000, the diffserv settings are disabled by default; the enable-diffserv parameter must be
enabled for the ERS 8000 to behave the same as the VSP 9000 and VSP 4000. Note that with these
settings, on any untagged L2 port, i.e. a port member of a C-VLAN used for an L2VSN, as there is no p-bit
to determine the QoS level, either the port or VLAN QoS level determines the QoS classification. To be
safe, it is recommended to enable the 802.1p-override parameter. This has the net effect of honoring the
DSCP value for L2 traffic so it makes no difference if the ingress port is tagged or untagged.
VSP 4000, VSP 9000, and ERS 8800 – QoS Configuration
VSP 4000 & VSP 9000: All C-VLAN port members – L2 and L3
interface gigabitEthernet <slot/port>
qos 802.1p-override enable
ERS 8000: All C-VLAN port members – L2 and L3
interface gigabitEthernet <slot/port>
qos 802.1p-override enable
enable-diffserv enable
If you do not wish to trust the incoming traffic, i.e. remark all traffic to Best Effort and use ACL’s to remark
traffic, you need to enable the access-diffserv parameter
VSP 4000, VSP 8000, VSP 7200, VSP 9000, and ERS 8000:
interface gigabitEthernet <slot/port>
access-diffserv enable
On the VSP 7000, by default, all ports are members of the default interface group allQoSPolicyIfcs has an
interface class of trusted resulting in all traffic being trusted. This results in honoring the DSCP value and
updating the 802.1 p-bit value based on the DSCP mapping table. If you wish to not trust the incoming
traffic and use Traffic Profiles to remark traffic, you need to create an interface group of untrusted.
qos if-group name <word> class untrusted
qos if-assign port <port list> name <word>