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Features of the IBP Module Introduction
Intelligent Blade Panel Module
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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.
2.1.1 MAC 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