XG700 User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2005-2006
4.8 Quality of Service (QoS)
The XG700 provides Quality of Service (QoS) that is based on the IEEE802.1p standard.
The XG700 QoS determines the priority of frames at the ingress side using DiffServ, VLAN tag (including priority tag) or port's
default priority. Their priorities are mapped to 4 output queues. These queues are processed in the precedence order. The
QoS transmits frames in order of their priority.
With the XG700, you can set:
DiffServ
Select the QoS using the IPv4 header or DiffServ Code Point included in the IPv6 header.
Default priority
Set default priority of 0 to 7 for each port.
For frames whose priority has not been set (VLAN-untagged frames). the default priority is assigned as the priority
value of the frame.
Mapping to output queues
The XG700 is equipped with four output queues with different levels (0 to 3). Frames are transmitted in order of output
queue priority.
Each priorities are mapped to specified output queue.
To set the default priority and output queue mapping, carry out the following procedure in the administrator EXEC mode.
Command
Task
xg# configure terminal
Switch to global configuration mode.
xg(config)# interface port 1 2 3
xg(config)# interface port range 1 3
Switch to interface edit mode for the port for which you
want to set the default QoS priority.
In this example, the global interface configuration mode
is selected for ports 1 though 3.
xg(config-if)# qos default-priority <0-7>
Set the frame's default priority when a frame whose
priority has not been set (VLAN-untagged frame)
arrives.
xg(config-if)# exit
Exit to global configuration mode.
xg(config)# bridge diffserv-tos {ipv4 | ipv6}
(Optional)
Used to enable QoS based on DiffServ Code Point.
xg(config)# qos-map priority <0-7>
output-priority <0-3>
Set the level of output queue you want to map to each
frame that has its own priority value when forwarding
them.
xg(config)# exit
Exit to administrator EXEC mode.
xg# show qos [ { default-priority | qos-map } ]
Show the QoS setting status.
