Cabletron Systems Spectrum EMM-E6 User Manual

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

Contents

Cabletron Systems Spectrum EMM-E6 User Manual Manual pdf 38 page image

Using the EMM-E6 Hub View2-22Monitoring Hub PerformanceGeneral/Error StatisticsThe General/Errors statistics windows display the following fields:Received BytesThe total number of bytes of data received by this network (channel), module, orport since the statistics window was opened or the Reset button was pressed.Total PacketsThe total number of packets of all types received by this network (channel),module, or port since the statistics window was opened or the Reset button waspressed.Avg Packet SizeThe average number of bytes per packet received by this network (channel),module, or port since the statistics window was opened or the Reset button waspressed. The average packet size is calculated after each polling interval bydividing the cumulative number of bytes received by the cumulative number ofpackets received.Broadcast PacketsThe total number of broadcast packets received by this network (channel),module, or port since the statistics window was opened or the Reset button waspressed. Broadcast packets have a single address recognized by each station onthe net: this address is designated in IP form as 255.255.255.255, or in MAChexadecimal form as FF-FF-FF-FF-FF-FF. The ARP and RARP requests sent bybridges and routers are broadcast packets.Multicast PacketsThe total number of multicast packets received by this network (channel),module, or port since the statistics window was opened or the Reset button waspressed. Multicast packets are simultaneously addressed to more than oneaddress, but fewer than all addresses.CollisionsThe total number of collisions recorded by this network (channel), module, orport since statistics window was opened or the Reset button was pressed. TheEMM-E6 counts both receive collisions — those detected while a port is receivingdata — and transmit collisions — those detected while a port is transmitting data(i.e., the port has transmitted one of the colliding packets); however, these countsare combined and a single total value is displayed. Collisions of this type (calledNOTEUnless you close, then re-open, a window or use the Reset button, statistical counterswill continue to increment until a value of 232-1 (approximately 4 billion) is reached, atwhich point they will roll over and restart at 0.