IP175DLF datasheet(48/145 Pages) ETC

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IP175DLF

Datasheet

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August 22, 2014

IP175DLF-DS-R10.1

3.6.3

Output Queue Scheduling

IP175DLF support four scheduling modes and list in Table 2.

Mode #

Mode 0

WRR

Mode 1

WFQ

WFQ(BE)

Mode 2

WFQ

Mode 3

SP: Strictly Priority; WRR: Weight Round Robin; WFQ: Weight Fair Queuing; BE: Best Effort

Table 2 Queue scheduling

SP:

In strictly priority, the packets in a queue will go first till its queue is empty.

WRR:

User can control the number of packet transmission on an output queue by setting its weight.

WFQ:

User can allocate a bandwidth on an output queue by setting its rate. Configuring WFQ bandwidth can be

through MII register 21.8-12.

3.7

Port mirror

There are some circumstances that the network administrator requires to monitor the network status. The

port mirroring function can help the network administrator diagnose the network.

A port mirroring function can be accomplished by assigning a monitored port and a snooping port. The

IP175DLF supports four kinds of monitoring methods: source port, destination port, one port of source

and destination, source-destination pair. This function can be enabled by programming the corresponding

bit in MII registers 20.20~20.21.

In addition to monitor a physical port, it can monitor traffic based on layer 2-4 Multi-Field packet header or

MAC address

3.8

Layer 2-4 Multi-Field Classification

IP175DLF support 8 Multi-Field entries. The Multi-Field table consists of a set of classification rules and

actions. This Multi-Field classification is a combination of one or more layer 2-4 packet header. The

classifier can classify incoming traffic to traffic class and traffic flow. The traffic class is a collection with the

same conditions. For example the classifier aggregates a collection of packet with the same DSCP. Traffic

flow can identify end-to-end traffic flow by using five-tuple (source IP, destination IP, protocol, source port

and destination port).

When packets are received by a port, the switch will search Multi-Field table. If incoming packets match a

predefined Multi-Field entry, the corresponding action is performed. The action consists of six parameters:

drop packet, limits incoming traffic bandwidth, monitor traffic bandwidth, forward to CPU, copy to mirror

port and queue number assignment. It is possible to match multiple entries for an incoming packet and

then the first matching entry is effective.

Each entry includes a counter called Multi-Field counter. This counter is useful for monitoring propose. A

counter keeps track of the number of bytes match predefined Multi-Filed condition. User also can

periodically read a Multi-Field to monitor a specific traffic rate.

3.9

MAC Address Table

P175D support 2K MAC addresses. The address table can configure either 2K unicast address or 1K

unicast address/1K multicast address. The multicast table occupies the MAC table from 0x400 to 0x7FF if

the AT_STR bit (reg 20.13.3) set to high. The MAC table is organized as hash table which consist of 512

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