IP175DLF datasheet(46/145 Pages) ETC

46 / 145 page

IP175DLF

Datasheet

46/145

August 22, 2014

IP175DLF-DS-R10.1

The operation of a port which forwards the packet

Frame type of the

received packet

Forward to a untagged filed

Forward to a tagged field

Untagged

Forward the packet without modification

Insert a tag using the default VLAN tag

value of the source port

Priority-tagged

(VLAN ID=0)

Strip tag

Only Replace the VID with PVID of the

source port

VLAN-tagged

Strip tag

Forward the packet without modification

Table 1 Determination of insertion and removal tag

3.6

Quality of Service (QoS)

IP175DLF uses a combination of traffic policy, priority classification and output queue scheduling to

achieve policy-based QoS. Since current internet carrier different type services, such as file transfer,

email, video, voice and Web. Because the switch offers a limited resource, it can not assure any resource

guarantees to applications or users. Traffic policy can aggregate traffic flow and police against its traffic

profile. This way can restrain the traffics from entering the switch effectively. Finally, packets will place into

appropriate output queue based on priority classification.

3.6.1

Traffic Policy

In IP175DLF traffic policy is a consisting of classifier, meter and dropper. The classifier separate received

packets into different traffic stream based on matched condition. IP175DLF provides 8 Multi-Field entries,

each entry is a combination of one or more layer 2-4 header. Multi-Field classification can classify packets

into traffic classes and traffic flows. For instance an end-to-end flow is recognized using five-tuple. Each

Multi-Field contains a meter for measuring the traffic. The meter passes the in-of-profile packets for

forwarding and put out-of-profile packets into dropper for dropping. User can configure the parameters of

traffic policy from MII register 26.0-23.

Each entry associated with Multi-Field counter is in order to monitor traffic rate by user (or CPU). The

counter value is represented in byte units. The user (or CPU) can monitor the traffic rate to periodically

read the value of multi-field counter through MII register.

3.6.2

Priority Classification

Priority classification is used to separate packets into four priority levels. In IP175DLF packet classification

can categorize packets based on port-based classification and frame-based classification. Port-based

classification, packets coming from the same port have a fixed priority level. Frame-based classification,

frame categorization is based on one header filed or a combination of more header fields. In frame-based

classification has a flexible packet classification to classify priority level and the following header fields are

provided by determining the priority.

- Special tag

- Source MAC address

- Destination MAC address

- VID

- VLAN priority

- IPv4 ToS/IPv6 DSCP

- TCP/UDP logical port

- Layer 2-4 Multi-Field

Figure 3-3 illustrates the priority classification flow chart.

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