Fujitsu BX600 manual Features of the IBP Module

Features of the IBP Module Introduction

2.1 Features of the IBP Module

The IBP provides a wide range of advanced performance-enhancing features. Multicast filtering provides support for real-time network applications. Flow control eliminates the loss of packets due to bottlenecks caused by port saturation. And broadcast storm suppression prevents broadcast traffic storms from engulfing the network. Some of the management features are briefly described below.

Head of Line Blocking

Head of Line (HOL) blocking results in traffic delays and frame loss caused by traffic competing for the same egress port resources. HOL blocking queues packets, and the packets at the head of the queue are forwarded before packets at the end of the queue.

Flow Control Support (IEEE 802.3X)

Flow control enables lower speed devices to communicate with higher speed devices, by requesting that the higher speed device refrains from sending packets. Transmissions are temporarily halted to prevent buffer overflows.

Back Pressure Support

On half-duplex links, the receiving port prevents buffer overflows by occupying the link so that it is unavailable for additional traffic.

Jumbo Frames Support

Jumbo frames are frames with an MTU size of up to 9K bytes, and better utilize the network by transporting the same data using less frames. The main benefits of this facility are reduced transmission overhead, and reduced host processing overhead. Less frames leads to less I/O interrupts. This facility is typically used for server-to-server transfers.

MDI/MDIX Support

The IBP Module automatically detects whether the cable connected to an RJ-45 port is crossed or straight through. Standard wiring for end stations is Media-Dependent Interface (MDI) and the standard wiring for hubs and switches is known as Media-Dependent Interface with Crossover (MDIX).

Auto Negotiation

Auto negotiation allows an IBP Module to advertise modes of operation. The auto negotiation function provides the means to exchange information between two devices that share a point-to-point link segment, and to automatically configure both devices to take maximum advantage of their transmission capabilities.

2.1.1MAC Address Supported Features

MAC Address Capacity Support

The IBP Module supports up to 16K MAC addresses. The IBP Module reserves specific MAC addresses for system use.

Static MAC Entries

MAC entries can be manually entered in the Bridging Table, as an alternative to learning them

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