3com 3800 Manual Do Utilizador

C

HAPTER

 9: S

TATUS

 M

ONITORING

 

AND

 S

TATISTICS

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 requires one probe per LAN segment, and stand-alone RMON 
probes have traditionally been expensive. Therefore, 3Com’s approach 
has been to build an inexpensive RMON probe into the agent of each 
Switch. This allows RMON to be widely deployed around the network 
without costing more than traditional network management.

For example, statistics can be related to individual ports and the Switch 
can take autonomous actions such as disabling a port (temporarily or 
permanently) if errors on that port exceed a predefined threshold. Also, 
since a probe must be able to see all traffic, a stand-alone probe must 
be attached to a nonsecure port. Implementing RMON in the Switch 
means that all ports can have security features enabled.

Table 9-5 details the RMON support provided by the Switch 3800.

Table 9-5   RMON Support Supplied By the Switch 3800

The Switch supports the EtherStats group.

A new or initialized Switch has two History sessions on each 
port:

■

30-second intervals

■

2-hour intervals

The Switch can store a maximum of 50 History sessions.

The Switch supports up to 50 alarms. You can enter or delete 
these alarms using an RMON management application.

A new or initialized Switch has events defined for use with 
the default alarm system.

SW3800.BK  Page 14  Tuesday, May 5, 1998  5:20 PM