3Com Switch 8800 Family Configuration Guide

188 CHAPTER 22: QOS CONFIGURATION
[3Com-port-group1] port GigabitEthernet 7/1/1 GigabitEthernet 7/1/2
4 Redirect the packet forwarded to the port group.
# Set the next hop of the packet forwarded to the port in port group 1 to 3.0.0.1.
[3Com-port-group1] traffic-redirect inbound ip-group 2000 rule 0 next-hop
3.0.0.1
QoS Configuration The following sections describe QoS configuration tasks.
■ “Configuring Service Parameter Allocation Rule”
■ “Configuring Traffic Policing”
■ “Configuring Traffic Shaping”
■ “Configuring Traffic Priority”
■ “Configuring Traffic Redirection”
■ “Configuring Queue Scheduling”
■ “Configuring Traffic Mirroring”
■ “Configuring Port Mirroring”
■ “Configuring Traffic Statistics”
n
■ Before initiating any of these QoS configuration tasks, you should first define
the corresponding ACL. Then you can achieve packet filtering just by activating
the right ACL.
■ To configure packet filtering, you need only to activate corresponding ACL. For
more details, refer to the section
“Activating ACL”.
Some of QoS terms are listed in the following table.
Tabl e 158 QoS terms
Term Description
CoS
It has the same meaning as 802.1p priority. Both refer to the priority at
packet header, with the value ranging from 0 to 7.
Service parameters
Switch allocates a set of parameters, which are used in achieving QoS
functions, upon receiving a packet. Four items are included: 802.1p
priority, DSCP priority, local precedence and drop precedence.
Drop-precedence
One of service parameters, ranging from 0 to 2. Drop precedence is
allocated when the switch receives the packet and may be when the
packet is processed. Allocating drop precedence to the packet is also
called coloring the packet: the packet with drop precedence 2 as red,
that with drop precedence 1 as yellow and that with drop precedence 0
as green. Drop precedence is referred to when switch needs to drop
packets in its congestion.