Revision 1.3a
Page 88
XLR 550 Manual
Figure 5.2
Network Diagram
High Priority
Low Priority
e1
e0
e1
e0
s0
s0
Device #1
Device #2
5.2.2.
QoS Configuration for XLR 550 Series
As shown in the above diagram, if devices on the Local Area Network cannot generate the Quality Of
Service (QOS) packets (802.1p or DSCP), then the XLR550 can provide QoS.
To achieve this connect high priority devices (e.g. VoIP device) to port e0 for example and low priority
devices (e.g. web surfing, file download) to the e1 port. And set up the priority of e0 to 7, e1 port to 0.
Device #1 Configuration Example
Device #2 Configuration Example
5.2.3.
QoS Classifier
5.2.3.1.
Overview
In a simple network where two LAN segments are being used its possible to configure a simple
‘
QoS
bridge
’
. For larger or more complex networks, a more complex QoS mechanism is required. The XLR
550 has 4 Priority Queue levels, which means it can provide 4 different priorities for 4 different
applications
For example, if we are running a delay critical application such as Voice Over IP (VoiP), then this should
be given the highest level of priority, Video streaming for example could be given a middle level of
priority and perhaps web browsing would be given low priority.
The mechanism used to determine the priority of packets is the industry standard DSCP (Differentiated
Services Code Point (this is found in the IP Header or priority field 802.1Q VLAN Tag.) The diagram
below shows a typical example.
In the example, it shows how to sort out and manage VoIP packets and general Internet packets using
DSCP.
XLR 550> (enable)
set devicetype co
XLR 550> (enable)
restart pme all
This command will restart all pmes.
Do you want to continue (y/n) [n]?
y
XLR550> (enable)
set vlmode transparent
This command will flush all vlan group.
Do you want to continue (y/n) [n]?
y
XLR550> (enable)
set port e0,e1 classifier fixed
XLR550> (enable)
set port e0 fixed-priority 7
XLR550> (enable)
set port e1 fixed-priority 0
XLR 550> (enable)
set devicetype rt
XLR 550> (enable)
restart pme all
This command will restart all pmes.
Do you want to continue (y/n) [n]?
y
XLR 550> (enable)
set vlmode transparent
This command will flush all vlan group.
Do you want to continue (y/n) [n]?
y
XLR 550> (enable)
set port e0,e1 classifier fixed
XLR 550> (enable)
set port e0 fixed-priority 7
XLR 550> (enable)
set port e1 fixed-priority 0