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Path awareness bandwidth control L2 switching traffic flow

IP.com Disclosure Number: IPCOM000127334D
Original Publication Date: 2005-Aug-24
Included in the Prior Art Database: 2005-Aug-24
Document File: 1 page(s) / 9K

Publishing Venue

IBM

Abstract

L2 LAN switches do NOT have bandwidth reservation function. L2 LAN Switches can have bandwidth reservation using feedback mechanism from the destination port.

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Path awareness bandwidth control L 2 switching traffic flow

1. NEEDS FOR THE SYSTEM

In Ethernet, link-layer flow control is provided by the IEEE 802.3x standard. The 802.3x implementation uses a MAC control PAUSE frame to hold off the sending party if congestion is detected. If, for example, receive buffers on a switch port are approaching saturation, the switch can issue a PAUSE frame to the transmitting device so that the receive buffers have time to empty. PAUSE frames are used between any devices and the switch ports to which they are attached to.

We can not guarantee or reserve the bandwidth with Ethernet. Because Link-layer flow control is provided by the IEEE 802.3x standard is connectionless. PAUSE frames are used between any devices and the switch ports to which they are attached with multicast MAC address and does not have conection-oriented information

2. THE CONCEPT OF THE SYSTEM

To issue PAUSE frames with connection-oriented information using Pad 42 bytes and the device can control the traffic using the connection-oriented information

The examples of the connection-oriented information using Pad 42 bytes are following. * The Source MAC addresses to control the traffic volume. * The Source MAC addresses to control the traffic volume and traffic volume to allocate. * The combination of Destination and Source MAC addresses to control the traffic volume.

PAUSE Frame IEEE 802.3x

Frame

Check Sequence

Pad

      Data
Length/

Type

Pad

      Data
Length/

Type

Pad

      Data
Length...