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RMON and the Stack
7-5
■
It reduces the load on the network and the management
workstation
Traditional network management involves a management
workstation polling network devices at regular intervals to gather
statistics and identify problems or trends. As network sizes and
traffic levels grow, this approach places a strain on the management
workstation and also generates large amounts of traffic.
An RMON probe, however, autonomously looks at the network on
behalf of the management workstation without affecting the
characteristics and performance of the network. The probe reports
by exception, which means that it only informs the management
workstation when the network has entered an abnormal state.
RMON and the
Stack
RMON requires one probe per LAN segment, and stand-alone RMON
probes have traditionally been expensive. Therefore, an inexpensive
RMON probe has been built into each stack. This allows RMON to be
widely deployed around the network without costing more than
traditional network management.
A problem with stand-alone RMON probes is that they are passive; able
to monitor and report, but nothing more. Placing probe functionality
inside the network device allows integration of RMON with normal
device management to allow proactive management.
For example, statistics can be related to individual ports and the stack
can take autonomous actions such as disabling a port (temporarily or
permanently) if errors on that port exceed a pre-defined threshold.
Also, since a probe needs to be able to see all traffic, a stand-alone
probe has to be attached to a non-secure port. Implementing RMON in
the stack means all ports can have security features enabled.
F24user.bk Page 5 Wednesday, July 15, 1998 4:27 PM
Summary of Contents for 8271 Nways Ethernet LAN Switch
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Page 14: ...4 SAFETY NOTICES F24user bk Page 4 Wednesday July 15 1998 4 27 PM...
Page 15: ...Safety Notices 5 F24user bk Page 5 Wednesday July 15 1998 4 27 PM...
Page 16: ...6 SAFETY NOTICES F24user bk Page 6 Wednesday July 15 1998 4 27 PM...
Page 20: ...10 ABOUT THIS GUIDE F24user bk Page 10 Wednesday July 15 1998 4 27 PM...
Page 22: ...F24user bk Page 2 Wednesday July 15 1998 4 27 PM...
Page 38: ...1 16 CHAPTER 1 INTRODUCING THE SWITCH F24user bk Page 16 Wednesday July 15 1998 4 27 PM...
Page 58: ...3 10 CHAPTER 3 SETTING UP FOR MANAGEMENT F24user bk Page 10 Wednesday July 15 1998 4 27 PM...
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Page 139: ...IV PROBLEM SOLVING Chapter 8 Problem Solving F24user bk Page 9 Wednesday July 15 1998 4 27 PM...
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Page 150: ...8 10 CHAPTER 8 PROBLEM SOLVING F24user bk Page 10 Wednesday July 15 1998 4 27 PM...
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Page 157: ...Important Safety Information A 5 F24user bk Page 5 Wednesday July 15 1998 4 27 PM...
Page 173: ...Important Safety Information A 21 F24user bk Page 21 Wednesday July 15 1998 4 27 PM...
Page 174: ...A 22 APPENDIX A SAFETY INFORMATION F24user bk Page 22 Wednesday July 15 1998 4 27 PM...
Page 184: ...D 4 APPENDIX D PIN OUTS F24user bk Page 4 Wednesday July 15 1998 4 27 PM...
Page 188: ...F 2 APPENDIX F TECHNICAL SUPPORT AND SERVICE F24user bk Page 2 Wednesday July 15 1998 4 27 PM...
Page 210: ...6 INDEX F24user bk Page 6 Wednesday July 15 1998 4 27 PM...