8-4
S
UMMIT
S
WITCH
I
NSTALLATION
AND
U
SER
G
UIDE
Q
UALITY
OF
S
ERVICE
(Q
O
S)
E
XPLICIT
T
RAFFIC
C
LASSIFICATION
Examples of trafÞc that have an explicit classiÞcation include tagged 802.1Q trafÞc that
contains the deÞned 802.1p priority bits and other similar mechanisms (such as 3ComÕs
PACE
ª)
. It can also be made explicit by virtue of which port in the Switch the trafÞc
was sourced from. Explicitly deÞned trafÞc uses only priority in differentiating its QoS.
Priority is used when there is bandwidth contention for the Switch to transmit.
P
RIORITY
MAPPINGS
FOR
E
XPLICIT
TRAFFIC
For explicit trafÞc classiÞcation, priority is determined in the following ways:
¥
Source port Ñ You can assign a source port to one of the four available explicit QoS
proÞles.
¥
.1p priority bits Ñ A Þxed mapping of the eight possible .1p values is done to the
four QoS proÞle priority categories. Values 0-1 is ÔqplowÕ; 2-3 is ÔqpnormalÕ; 4-5 is
ÔqpmediumÕ and 6-7 is ÔqphighÕ.
¥
PACE Ñ TrafÞc with the Universally/Locally (U/L) Administered bit enabled in the
source address will be associated with the qpmedium QoS proÞle.
A
SSIGNING
A
Q
O
S P
ROFILE
TO
A
T
RAFFIC
C
LASSIFICATION
Once you have established one or more trafÞc classiÞcations and conÞgured one or
more QoS proÞles, you must match them together using one of the following
commands:
config VLAN <name> <portlist> qosprofile <qosname>
or
config port <portlist> qosprofile <qosname>
SUMMIT.BK Page 4 Thursday, September 25, 1997 12:33 PM
