Differentiated services or DiffServ is a computer networking architecture that specifies a mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks.

This section provides the DSCP and precedence values used in QoS class maps and policy maps. Unless noted as a restriction, you can mark both incoming and outgoing packets. Table 6-1 lists the commonly used DSCP values described in RFC 2475. Table 6-2 lists the RFC 791 precedence values from least to most important.

DSCP 主要关注转发路径组件。在报文转发路径、差异化业务通过将包含在IP包头字段中的代码点（codepoint）映射到每个节点的特定转发处理或每跳行为(PHB, per-hop behave)。

The first 3 bits are used to define a precedence. The higher the value, the more important the IP packet is, in case of congestion, the router would drop the low-priority packets first. The type of service bits are used to assign what kind of delay, throughput, and reliability we want.

Services can be constructed by a combination of: - setting bits in an IP header field at network boundaries. (autonomous system boundaries, internal administrative boundaries, or hosts), - using those bits to determine how packets are forwarded by the. nodes inside the network, and.

2024年11月15日 · Pool 3 codepoints are now utilized for . or local use, as specified by [RFC8436]. The pools are defined in the . following table (where 'x' refers to either '0' or '1'). a new codepoint from the DSCP registry. The registrations are identical for IPv4 and IPv6.

The differentiated services code point (DSCP) values are defined by the first six bits of the DSCP/ToS byte. The last two bits can and are being used for ECN (Explicit Congestion Notification) as defined in RFC 3168. DSCP defines several traffic classes. The primary DSCP classes are, per RFC 4594, and RFC 8622: Lower-Effort (LE) Default ...

2024年9月5日 · The six most significant bits of the DiffServ field is called as the DSCP. The last two Currently Unused (CU) bits in the DiffServ field were not defined within the DiffServ field architecture; these are now used as Explicit Congestion Notification (ECN) bits.

2024年12月31日 · DSCP是IP数据包中的一个服务质量标记字段的值，用于定义特定的服务类型信息。 它通过在IP报头中设置特定的代码点来标识流量的优先级，这些代码点允许网络设备根据流量的优先级进行不同的处理，从而实现QoS的保证。 DSCP使用6个比特位（bit）来表示，其值的范围为0到63。 这些比特位被用来编码不同的优先级和服务类型。 每个DSCP编码值都被映射到一个已定义的PHB（Per-Hop-Behavior，每跳行为）标识码，该标识码定义了数据包在网络中每经 …

2023年10月11日 · Differentiated Services (DiffServ) is defined as a class of service (COS) model that is used to describe and control the IP network traffic by class. The main aim of differentiated services is to give priority to the specific traffic that needs an uninterrupted flow of data.