ZXR10 5900/5200 Series User Manual (Basic Configuration Volume)
Traffic classification of QoS is based on ACL and the ACL rule must
be permit. The user can classify packets according to some filter
options of the ACL which are as follows: Source IP address, desti-
nation IP address, source MAC address, destination MAC address,
IP protocol type, TCP source port No. TCP destination port No.,
UDP source port No., UDP destination port No., ICMP type, ICMP
code, DSCP, ToS, precedence, source VLAN ID, Layer 2 Ethernet
protocol type and 802.1p priority value.
Traffic Policing
Traffic policing is to impose restriction on bandwidth occupied by
some traffic flow to prevent it from exceeding specified bandwidth
and thus affecting other services. As for the exceeding amount of
traffics, conduct the following operation:
�
Discard or forward
�
Modify its DSCP value
�
Modify its drop precedence (packets with higher drop prece-
dence will be dropped preferentially when congestion occurs)
Traffic policing will not introduce extra delay. Its working process
is shown in
Figure 19
.
F
IGURE
19 TRAFFIC POLICING WORKING FLOW
ZXR10 5900/5200 implements the Single Rate Three Color Marker
(SrTCM) (RFC2697) and Two Rate Three Color Marker (TrTCM)
(RFC2698) functions, which both support the color-blind and color-
aware modes.
It assumes that packets are colorless in color-blind mode but as-
sumes that packets are marked in a color in color-aware mode.
On the switch, each packet traversing the switch will be assigned
a color according to some principle (packet information). Maker
colors the IP packet according to result from Meter and the color
is marked in DS field.
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