Configuring QoS 159

the classification standards are encapsulated in the header of the packets. The packet content is seldom used as the classification standard.

Packet Filter

Packet filters filter network traffic. For example, the deny operation discards the traffic that is matched with a traffic classification rule, while allowing other traffic to pass through. With the complex traffic classification rules, Ethernet switches enable the filtering of information carried in Layer 2 traffic to discard useless, unreliable, or doubtful traffic, and to enhance network security.

To filter packets:

1Classify the incoming traffic according to the classification rule.

2Filter the classified traffic.

Traffic Policing

To deliver better service with limited network resources, QoS monitors the traffic of the specific user on the incoming traffic, so it can make better use of the assigned resources.

Bandwidth Assurance

Through the traffic reservation, a minimum bandwidth is reserved for specified traffic flow. Even when network congestion occurs, QoS requirements such as packet dropping ratio, delay, and jitter can also be satisfied.

Port Traffic Limit

The port traffic limit is the port-based traffic limit used for limiting the general speed of packet output on the port.

Redirection

You can specify a new port to forward the packets according to your requirements on the QoS policy.

Traffic Priority

The Switch 7750 can deliver priority tag service for special packets. The tags include TOS, DSCP and 802.1p, etc., which can be used and defined in different QoS modules.

Queue Scheduling

When congestion occurs, packets compete for resources. Strict-Priority Queue (SP) algorithms overcome the problem.

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3Com 10014298 Packet Filter, Traffic Policing, Bandwidth Assurance, Port Traffic Limit, Redirection, Traffic Priority