Digisol DG-GS4826S, Руководство по управлению

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C
HAPTER
41 | Quality of Service Commands
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When a packet of size B bytes arrives at time t, the following happens if
trTCM is configured to operate in color-aware mode:
n
If the packet has been precolored as red or if Tp(t)-B < 0, the
packet is red, else
n
if the packet has been precolored as yellow or if Tc(t)-B < 0, the
packet is yellow and Tp is decremented by B, else
n
the packet is green and both Tp and Tc are decremented by B.
u
The trTCM can be used to mark a IP packet stream in a service, where
different, decreasing levels of assurances (either absolute or relative)
are given to packets which are green, yellow, or red. Refer to RFC 2698
for more information on other aspects of trTCM.
E
XAMPLE
This example creates a policy called “rd-policy,” uses the class command to
specify the previously defined “rd-class,” uses the set command to classify
the service that incoming packets will receive, and then uses the police
trtcm-color-blind command to limit the average bandwidth to 100,000
Kbps, the committed burst rate to 4000 bytes, the peak information rate to
1,000,000 kbps, the peak burst size to 6000, to remark any packets
exceeding the committed burst size, and to drop any packets exceeding
the peak information rate.
Console(config)#policy-map rd-policy
Console(config-pmap)#class rd-class
Console(config-pmap-c)#set ip dscp 3
Console(config-pmap-c)#police trtcm-color-blind 100000 4000 100000 6000
exceed-action 0 violate-action drop
Console(config-pmap-c)#
set
This command modifies the CoS, DSCP or IP Precedence value in a
matching packet (as specified by the match command). Use the no form to
remove this traffic classification.
S
YNTAX
[ no ] set { cos new-cos | ip dscp new-dscp | ip precedence new-ip-
precedence }
new-cos - New Class of Service (CoS) value. (Range: 0-7)
new-dscp - New Differentiated Service Code Point (DSCP) value.
(Range: 0-63)
new-ip-precedence - New IP Precedence value. (Range: 0-7)
D
EFAULT
S
ETTING
None
C
OMMAND
M
ODE
Policy Map Class Configuration