Cabletron Systems SEHI-22/24 User Manual

Also see for SPECTRUM: User guide User guide User guide User guide User guide

Contents

3-1Chapter 3Link/Seg TrapsWhat are Link and Segmentation traps; enabling and disabling these traps at the device, module, andport levelsAmong the traps which Cabletron devices are designed to generate are trapswhich indicate when a repeater port gains or loses a link signal, when the repeatersegments (disconnects) a port due to collision activity, and when a segmentedport becomes active again. In some networks, these Link and Segmentation trapsmay be more information than a network manager wants to see. So SPMAprovides you with a means to selectively enable and disable Link andSegmentation traps: you can turn traps on and off for all ports on the SEHI, allports on a selected module or modules, or for individual ports.What is a Segmentation Trap?Cabletron’s Ethernet repeaters count collisions at each port. If a port experiences32 consecutive collisions, the repeater segments the port to isolate the source ofthe collisions from the rest of the network. When the repeater segments a port, itgenerates a portSegmenting trap. As soon as a segmented port receives a goodpacket, the repeater reconnects the port to the network and generates aportUnsegmenting trap.NOTESPMA does not accept the trap messages; that task is left to your network managementsystem. (See the appropriate network management system documentation for detailsabout viewing trap messages.) When this utility is used in stand-alone mode, traps willeither be ignored when they return to the workstation from which you are running SPMAfor the SEHI, or they will turn up at another management workstation which has beenconfigured to accept traps. Note also that, regardless of the configuration performed usingthis utility, NO traps will be sent by the device unless its trap table has been properlyconfigured; see the SEHI hardware manual and/or the Trap Table chapter in the SPMATools Guide for more information.