Extreme Networks Summit1 - Manual (Page 122)

8-2 S UMMIT S WITCH I NSTALLATION AND U SER G UIDE
Q UALITY OF S ERVICE (Q O S)
QoS profiles are assigned to traffic classifications, independent of the QoS mode chosen,
in order to modify switch forwarding behavior.
Q O S M ODE
There are two modes of QoS. Ingress mode, the default, can use a wide variety of traffic
classifications, but has a limitation of being able to use only the default four QoS
profiles. You can modify the bandwidth parameters of the default QoS profiles.
Using egress mode, you can define additional QoS profiles, but you must use a smaller
selection of traffic classifications. You can modify both the prioritization and bandwidth
parameters of user-defined QoS profiles.
D EFAULT Q O S P ROFILES
Four default QoS profiles are provided that cannot be deleted. The default QoS profile
names are as follows:
• qp1
• qp2
• qp3
• qp4
The default QoS profiles exist in either ingress or egress mode. In ingress mode, only
the default QoS profiles are observed. In egress mode, up to 28 additional custom
profiles may be defined, for a total of 32. You cannot create custom profiles in ingress
mode.
The parameters that make up a QoS profile include the following:
• Minimum bandwidth — The minimum percentage of bandwidth that the traffic
requires. The switch is required to provide the minimum amount of bandwidth to
the traffic. The lowest possible value is 0%.
• Maximum bandwidth — The maximum percentage of bandwidth that the traffic is
permitted to use.
• Priority — The level of priority in which the traffic will be serviced by the switch.
Choices include:
— Low
— Normal
Summit.bk : 8QOS.FM Page 2 Thursday, June 18, 1998 9:27 AM