Enterasys Networks 6H352-25 manual Flow Control, Garp Switch Operation, 12 802.1 Port Priority

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Flow Control

1.10 FLOW CONTROL

Flow control is a method of managing the flow of frames between two devices. It ensures that a transmitting device does not saturate a receiving device with data. This is accomplished by the transmitting device pausing its transmission while the receiving device processes the frames already received.

The 6H352-25 supports the following two types of flow control:

Frame based 802.3x

Back pressure

Frame based 802.3x flow control is supported on all Ethernet ports operating in the full-duplex mode. Flow control can be enabled or disabled on a port-by-port basis.

Back pressure flow control is supported on all Ethernet ports operating in the half-duplex mode of operation. Flow control can be enabled or disabled on a port-by-port basis.

1.11 GARP SWITCH OPERATION

Some or all ports on the switch may be activated to operate under the Generic Attribute Registration Protocol (GARP) applications, GARP VLAN Registration Protocol (GVRP) and/or GARP Multicast Registration Protocol (GMRP).

GARP is a protocol, or set of rules, that outlines a mechanism for propagating the port state and/or user information throughout a bridged LAN to keep track of users and VLANs on the network fabric. MAC bridges and end users alike can take part in the registration and de-registration of GARP attributes such as VLAN and multicast group membership. For more details on how GVRP and GMRP handle frames under GARP, and how to configure the switch ports to take advantage of this operation, refer to the Enterasys Networks MATRIX E7 Series and SmartSwitch 6000 Series Modules Local Management User’s Guide.

1.12 802.1 PORT PRIORITY

The 802.1 port priority is used to assign a default priority to the frames received without priority information in their tag header, map prioritized frames to the appropriate transmit queues, and prioritize frames according to protocol type. The 802.1 port priority is part of the IEEE 802.1D standard.

1-6Introduction

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Contents 6H352-25 Fast Ethernet Installation Guide Page Page Industry Canada Notice FCC NoticeVcci Notice Enterasys NETWORKS, INC Program License Agreement Page Declaration of Conformity Page Contents Network Requirements Figures Tables Using this Guide About This GuideStructure of this Guide Related DocumentsDocument Conventions Guide uses the following conventionsGetting Help Introduction 6H352-25 Module Optional HSIMs and VHSIMs ConnectivityRuntime IP Address Discovery SmartTrunk HALF-DUPLEX/FULL-DUPLEX AUTO-NEGOTIATIONRemote Monitoring Rmon PORT/VLAN Redirect Functions Broadcast SuppressionTraffic Rate Limiting Flow Control Garp Switch Operation12 802.1 Port Priority Distributed Chassis Management Switching OptionsManagement Lanview Diagnostic LEDs Standards CompatibilityNetwork Requirements SmartTrunk Feature10BASE-T Network 100BASE-TX Network Installation Installing Optional HSIM, VHSIM, or Flash Memory Upgrade Unpacking the 6H352-25Installing the Module Into the Matrix E7 Chassis Installing the 6H352-25 into the Matrix E7 Chassis Installing the Module Into the SmartSwitch Chassis Installing the 6H352-25 into the SmartSwitch 6000 Chassis Connecting to the Network RX LED TX LED Crossover Cable RJ45 Pinouts Completing the Installation Troubleshooting Using LanviewGroup Select No link Is enabled and there is a Troubleshooting Checklist OFFRefer to Matrix E7 Series Using the Reset Button Reset Button8Troubleshooting Specifications PortsCOM Port Pinout Assignments EnvironmentalRegulatory Compliance Page Mode Switch Bank Settings and Options Required ToolsSetting the Mode Switches Figure B-1 Mode Switch LocationSetting the Mode Switches Flash Memory Upgrade Locating the Flash MemoryInstalling the Flash Memory Installing Optional Hsim or Vhsim Interface Modules Figure B-4 Hsim and Vhsim Connector LocationsIndex NumericsIndex-2