Rmon Statistics - Linksys DSHSNMP User Manual

RMON Statistics

RMON, (short for Remote MONitoring), allows you to view
detailed statistical information about your managed hubs' per-
formance. There are nine levels, or layers, that an RMON
application can collect information about. The current
firmware version on the Linksys StackPro II SNMP module
supports layer 1, the statistical layer. Later firmware versions
will support other RMON layers.
You can view the statistics for any hub in the managed stack.
First, select RMON Statistics from the menu in the left hand
frame of the browser. You will see the statistics for the active
hub. To view the statistics for another hub, first choose another
hub by clicking on its location in the stack in the top browser
frame. Next, click on RMON Statistics in the menu in the left-
hand frame of the browser window to refresh the data.
The RMON layer 1 statistics use numerical counters to meas-
ure the number of frames, packets, and octets travelling on the
network. The terms frame and packet can, in this case, be used
interchangeably to describe a block of information that is sent
over a network. The network drivers on your computer takes
the piece of information to be sent over the network and
breaks it up into packets.
A good packet is between 64 and 1,518 octets long. An octet,
which is often refered to as a byte, is a group of eight bits of
data. If a packet is too short, too long, or fragmented, then it is
corrupted and is refered to as a bad packet or and error packet.
Every packet or frame contains a Frame Check Sequence, or
FCS. This is a basic algorithmic sequence that is used to detect
errors within the frame or packet. If the FCS is bad or miss-
ing, then the packet is corrupted