Table 6-4 Type Of Service Field (Ip Precedence - I Ref. Rec 1349); Ip Precedence - NEC SL1100 Networking Manual

Issue 6.0
6.4
6 - 22

IP Precedence

IP Precedence is a QoS method that combines a priority value with different
on/off parameters; Delay, Throughput, Reliability and Cost. The MBZ (Must
be Zero) bit is not used.
Using the ToS bits, you can define up to eight classes of service. Other
devices configured throughout the network can then use these bits to
determine how to treat the packet in regard to the type of service to grant it.
These other QoS features can assign appropriate traffic-handling policies
including congestion management and bandwidth allocation. By setting IP
Precedence levels on incoming traffic and using them in combination with
QoS queuing features, you can create differentiated service.

Table 6-4 Type of Service Field (IP Precedence - i Ref. REC 1349)

3 Bits
IP Precedence Value
IP Precedence Value
Binary
Value
Value
0 000
1 001
2 010
3 011
4 100
5 101
6 110
7 111
Delay
Value Description
0 Normal Delay
1 Low Delay
1 Bit 1 Bit
Delay Throughput Reliability
Description
Routine
Priority
Immediate
Flash.
Flash Override
CRITIC/ECP
Internetwork Control
Network Control
NEC SL1100
1 Bit 1 Bit
Cost
Throughput
Value Description
0 Normal Throughput
1 High Throughput
Reliability
Value Description
0 Normal Reliability
1 High Reliability
Cost
Value Description
Network Design Considerations
1 Bit
MBZ
(must be
zero)