3Com 3C17300A Implementation Guide - Page 60

60 CHAPTER 7: STATUS MONITORING AND STATISTICS Table 4 RMON support supplied by the Switch RMON group Statistics History Alarms Events Support supplied by the Switch A new or initialized Switch has one Statistics session per port. A new or initialized Switch has two History sessions per port. These sessions provide the data for the Web interface history displays: ■ 30 second intervals, 120 historical samples stored ■ 2 hour intervals, 96 historical samples stored A new or initialized Switch has the following alarm(s) defined for each port: ■ Broadcast bandwidth used ■ Percentage of errors over one minute You can modify these alarms using an RMON management application, but you cannot create or delete them. You can define up to 200 alarms for the Switch. For more information about the alarms setup on the Switch, see "Alarm Events" on page 60 and "The Default Alarm Settings" on page 61. A new or initialized Switch has Events defined for use with the default alarm system. See "The Default Alarm Settings" on page 61 for more information. When using the RMON features of the Switch, note the following: ■ After the default sessions are created, they have no special status. You can delete or change them as required. ■ The greater the number of RMON sessions, the greater the burden on the management resources of the Switch. If you have many RMON sessions, the forwarding performance of the Switch is not affected but you may experience slow response times from the web interface. Alarm Events You can define up to 200 alarms for the Switch. The events that you can define for each alarm and their resulting actions are listed in Table 5. Table 5 Alarm Events Event No action Notify only Action Send Trap.