Cabletron Systems SMARTSWITCH ROUTER 9032578-05 User Manual
Page 327
SmartSwitch Router User Reference Manual
301
Chapter 21: QoS Configuration Guide
are rewritten to the
the
For example, the following command will rewrite the ToS Precedence field to 7 if the ToS
Precedence field of the incoming packet is 6:
In the above example, the
value of 224 (binary value 1110 0000) are ANDed together to specify the ToS Precedence
field value of 6 (binary value 110). Changing the value in the
determines the bit in the ToS octet field that will be examined.
The following example will rewrite the ToS Precedence and the ToS fields to 5 and 30 if the
incoming packet is from the 10.10.10.0/24 network with the ToS Precedence field set to 2
and the ToS field set to 7. (In this example, the MBZ bit is included in the ToS field.) The
figure below shows how the parameter values are derived.
The <tos-mask> value determines the ToS bit to be examined, which is all eight bits in this
example. The following command configures the ToS rewrite for the example:
ssr(config)# qos set ip tosp6to7 low any any any any 222 any any 224 7
1
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
0
Incoming Packet:
<tos> = 71
ToS Precedence = 2
ToS = 7
Mask (look at
<tos-mask> = 255
ToS Precedence = 5
ToS = 30
<tos-precedence-rewrite> = 5
Rewritten ToS byte
for 10.10.10.0/24
packet:
all bits):
ssr(config)# qos set ip tos30to7 low 10.10.10.0/24 any any any 71 any
any 255 5 30