Cabletron Systems 2000 User Manual

Also see for 2000: User guide Getting started guide

Contents

Managing Ethernet MicroLAN Switches5-18Alarm LimitsPacketsUse the text box in this field to determine the total number of packets (includingall errors except collisions) that must be processed by the repeater, board, or portwithin the user-specified time before an alarm is triggered. Allowable values are 1to ≈ 4 billion (232-1).Broadcast PacketsUse the text box in this field to determine the number of broadcast packets thatmust be processed by the repeater, board, or port within the user-specified timebefore an alarm limit is reached. Allowable values are 1 to ≈ 4 billion (232-1).% Errors of TypeUse the text box in this field to determine what percentage of packets received bythe repeater, board, or port within the specified time interval can be errors of theselected type or types before an alarm is triggered. Allowable values are one to100; percentages will be calculated based on the number of error packets of alltypes selected (all those with an check in their check box). Again, a repeater-levelalarm will count all selected error types received by the repeater channel; aport-level alarm will count only selected error types received by the individualport. (Remember, on an Ethernet MicroLAN Switch, a board is equivalent to arepeater channel.)You can select any combination of the following error types:CRC Errors If this check box is selected, all packets with CyclicalRedundancy Check (CRC) errors will be included incalculating the overall percentage of errors.Framing Errors If this check box is selected, all misaligned packets willbe included in calculating the overall percentage oferrors. A misaligned packet is one with a non-integralnumber of bytes; these are also sometimes referred to asalignment errors.Runts If this check box is selected, the number of runt packetswill be included in calculating the overall percentage oferrors. A runt packet is one that is less than the minimumEthernet frame size of 64 bytes.OOW Collisions If this check box is selected, all collisions out of thestandard collision window (51.2 μs) will be included incalculating the overall percentage of errors.Out-of-window collisions are typically caused by faultynetwork design.Giants If this check box is selected, the number of giant packetswill be included in calculating the overall percentage oferrors. A giant packet exceeds the maximum Ethernetframe size of 1518 bytes (excluding the preamble).