Siemens 60, 80, 40, 20 manual Administration Network QoS Service

Administration

IP Network Parameters

Administration via WBM

Network > QoS

Administration via Local Phone

---Administration

---Network

--- QoS

---Service

---Layer 2

---Layer 2 voice

---Layer 2 signalling ---Layer 2 default

3.3.1.2Layer 3 / Diffserv

Diffserv assigns a class of service to an IP packet by adding an entry in the IP header.

Traffic flows are classified into 3 per-hop behavior groups:

1.Default

Any traffic that does not meet the requirements of any of the other defined classes is placed in the default per-hop behaviour group. Typically, the forwarding has best-effort forwarding characteristics. The DSCP (Diffserv Codepoint) value for Default is "0 0 0 0 0 0".

2.Expedited Forwarding (EF referred to RFC 3246)

Expedited Forwarding is used for voice (RTP streams) by default. It effectively creates a special low-latency path in the network. The DSCP (Diffserv Codepoint) value for EF is "1 0 1 1 1 0".

3.Assured Forwarding (AF referred to RFC 2597)

Assured forwarding is used for signaling messages by default (AF31). It is less stringent than EF in a multiple dropping system. The AF values are containing two digits X and Y (AFXY), where X is describing the priority class and Y the drop level.

Four classes X are reserved for AFXY: AF1Y (high priority), AF2Y, AF3Y and AF4Y (low priority).

A31003-O1010-M100-9-76A9, 05/05/2008	3-11
HiPath 8000 - OpenStage Family, Administration Manual