Hitachi GR2000 Series manual Combined Setting of Pair Switch and Possibility of Use

Filtering/QoS Information

When the upper protocol number is undefined or when numbers other than 6(TCP) or 17(UDP) are defined in the upper protocol number.

Table 1-91 Combined Setting of Pair Switch and Possibility of Use

Item	Combined Setting of Pair	Possibility	Processing
	Switch (Note 2)	of Use
1	-ip_pair_off	Possible	The source and destination IP addresses are
			checked without being replaced.
			• Possible
2	-ip_pair	Possible	The source and destination IP addresses are
			checked in both cases below.
			• When they are not replaced
			• When they are replaced

*: -port_pair_off / -port_pair and -pair_synchronized_off/-pair_synchronized switches are invalidated when the upper protocol number is undefined or when numbers other than 6(TCP) or 17(UDP) are defined in the upper protocol number.

The calculation expression for obtaining a TOS value is as follows:

TOS value = precedence (0-7) x 32 ( Delay (0, 1) x 16 ( Throughput (0, 1) x 8 ( Reliability (0, 1) x 4 A calculation example of the TOS value is shown below.

2. The formula to calculate the TOS number is:

ExamplesTofhroughput(0,1)x8+Reliability(0,1)x4OSthenumber=precedence(0calculated TOS number-7)x32+Delay(0,1)x16+are shown below.

Table 1-92	TOS Number Calculation
Precedence		Delay	Throughput	Reliability	TOS Number
0					0
1					32
2					64
3					96
4					128
5					160
6					192
7					224

3. The upper 6 bits of the TOS field are replaced and the lower 2 bits are ignored even if this parameter is set. Table -93 shows the TOS replacing value for setting value. TOS value of output packet is the one that added TOS value lower 2 bits of output value to TOS replacing value. Replacing of DS field of Diff-serv is executed by the same condition for TOS replacement.

GR2K-GA-0014	1-183
Ver. 07-02