Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Instrukcja Użytkownika Strona 37
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SNMP, BootP, DHCP, and RARP Concepts
303542-A Rev 00
2-7
Thresholds
SNMP uses a management information base (MIB) to manage the router. The
MIB includes an extensive collection of statistics (MIB variables) that track the
router’s performance and provide early warnings of abnormal operating
conditions.
With the Site Manager threshold feature, you can configure the agent to
automatically notify you when specific statistics (or instances of the variable)
reach certain levels.
You can set a threshold for any integer, counter, gauge, or time-tick variable in the
MIB. Using the threshold parameters, you:
• Select the polling interval, which specifies how often the agent checks the
statistic to see if its value has reached the threshold.
• Set three threshold values (high, medium, and low).
• Specify the threshold action as Lessthan or Greaterthan.
For information about setting thresholds, see “Configuring Thresholds” on
page 3-26
.
When the statistic reaches the threshold, the agent generates an event. You specify
the severity level at which you want the manager to log the event. Table 2-1
shows
the available severity levels and their suggested meanings. Depending on how you
configure the SNMP trap parameters (see “Configuring Traps on the Router” on
page 3-19), the agent may also send the threshold exception as an SNMP trap.
The Site Manager threshold feature is functionally similar to the RMON Alarm
and Event facility, except for some minor differences. The Site Manager threshold
feature provides three-tiered thresholds and defines a user-definable hysteresis
mechanism. The RMON Alarm and Event facility provides a two-tiered
proprietary threshold system. For information on RMON, RMON 2, and RMON
alarms and events, see Configuring RMON and RMON 2 for BayRS Routers.
- Configuring SNMP 1
- BootP, DHCP, and RARP 1
- Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 303542-A Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- How to Get Help 18
- Chapter 1 19
- Starting SNMP, BootP 19
- DHCP, and RARP Services 19
- Starting Configuration Tools 20
- Using the BCC 21
- Starting SNMP Services 23
- Customizing SNMP Services 24
- Starting BootP Services 25
- Starting DHCP Services 26
- Enabling DHCP on an Interface 27
- Starting RARP Services 28
- Chapter 2 31
- SNMP, BootP 31
- DHCP, and RARP Concepts 31
- SNMP Messages 32
- SNMP Communities 33
- SNMP Implementation Notes 34
- Table 2-1. Severity Levels 35
- Thresholds 37
- Threshold Example 38
- BootP Relay Agent Overview 40
- DHCP Overview 44
- RARP Overview 50
- Chapter 3 51
- Customizing SNMP 51
- Disabling and Reenabling SNMP 53
- Using Site Manager 54
- Specifying a Lock Address 56
- Adding SNMP Communities 59
- Deleting an SNMP Community 62
- Adding a Manager 63
- Deleting a Manager 67
- Specifying a Trap Entity 69
- Disabling a Trap Entity 72
- Configuring Trap Exceptions 73
- Deleting Trap Exceptions 75
- Configuring Thresholds 76
- Adding a Threshold 78
- Specifying Threshold Units 81
- Chapter 4 87
- BootP Server and the Routers 91
- BOOTREQUEST Packets 93
- Customizing BootP 101
- (continued) 102
- (continued) 102
- Deleting BootP Globally 104
- Customizing DHCP 105
- Chapter 5 105
- Deleting DHCP Globally 108
- Chapter 6 109
- Customizing RARP 109
- Customizing RARP Parameters 110
- Disabling RARP Globally 113
- Deleting RARP Globally 113
- Appendix A 115
- SNMP, BootP, DHCP, and RARP 115
- Parameter Descriptions 115
- Caution: 116
- SNMP Global Parameters 117
- SNMP Community Parameters 119
- SNMP Manager Parameters 120
- BootP and DHCP Parameters 130
- BootP Address Parameters 132
- RARP Interface Parameters 137
- RARP Address Parameters 137
- Appendix B 139
- Default Parameter Settings 139
- RARP Parameters 142
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