Priority Trust; Traffic Classification - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
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Best-effort
Best-effort service is the most basic and simplest service model on the Internet (IPv4 standard)
based on storing and forwarding mechanism. In Best-effort service model, the application can
send a number of packets at any time without being allowed in advance and notifying the
network. For the Best-effort service, the network will send packets as possible as it can, but it
does not guarantee the delay and reliability.
Best-effort is the default Internet service model now, suitable to most network applications,
such as FTP and E-mail. It is implemented by First In First Out (FIFO) queue.
DiffServ
The DiffServ model is a multi-service model, which can satisfy different QoS requirements.
The DiffServ model does not need to maintain state for each flow. It provides differentiated
services according to the QoS classification of each packet. Many different methods can be
used for classifying QoS packets, such as IP packet priority (IP precedence), the packet source
address or destination address.
Generally, DiffServ is used to provide end-to-end QoS services for a number of important
applications, which is implemented through the following techniques:
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7.1.2 Priority trust

Priority trust means that the ISCOM2600G-HI series switch uses priority of packets for
classification and performs QoS management.
The ISCOM2600G-HI series switch supports packet priority trust based on interface,
including:
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7.1.3 Traffic classification

Traffic classification refers to identifying certain packets according to specified rules and
performing different QoS policies on packets matched with different rules. Traffic
classification is the premise and basis for differentiated services.
The ISCOM2600G-HI series switch supports traffic classification based on ToS priority,
DSCP, and CoS over IP packets, and classification based on Access Control List (ACL) rules
and VLAN ID. The traffic classification procedure is shown in Figure 7-1.
Differentiated Services (DiffServ)
Committed Access Rate (CAR): CAR refers to classifying the packets according to the
preconfigured packet matching rules, such as IP packets priority, the packet source
address or destination address. The system continues to send the packets if the flow
complies with the rules of token bucket. Otherwise, it discards the packets or remarks IP
precedence, DSCP, EXP CAR can not only control the flows, but also mark and remark
the packets.
Queuing technology: the queuing technologies of SP, WRR, DRR, SP+WRR, and
SP+DRR cache and schedule the congestion packets to implement congestion
management.
Differentiated Services Code Point (DSCP) priority
Class of Service (CoS) priority
ToS priority
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