Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Manuel d'utilisateur Page 51
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SNMP, RMON, BootP, DHCP, and RARP Concepts
117362-A Rev. A 2-15
Capture Group
The capture group enables the capture of packets that satisfy the filter group
control parameters for a particular channel. Control parameters in the
bufferControlTable specify how to transfer data from the channelTable to the
captureBufferTable. For example, you can specify the maximum number of octets
from each packet that the group can store in the captureBufferTable. To use the
capture group, you must set up the filter group.
Alarm Group
The alarm group allows you to set an alarm threshold and a sampling interval to
enable the RMON agent to generate alarms on any network segment it monitors.
Alarm thresholds can be based on absolute or delta values, so that you can be
notified of rapid spikes or drops in a monitored value.
Each alarm is linked to an event in the event group. An event defines an action that
triggers when the alarm threshold is exceeded.
The alarm group periodically takes statistical samples from variables in the
Ethernet DCM and compares them to previously configured thresholds. The
Alarm Table stores configuration entries that define a variable, a polling period,
and threshold parameters. If the RMON agent determines that a sample crosses
the threshold values, it generates an event. The RMON agent monitors any
variables that resolve to an ASN.1 primitive type of integer (integer, counter,
gauge, or TimeTick) in this way.
You can specify rising or falling thresholds, indicating network faults such as slow
throughput or other network-related performance problems. You specify rising
thresholds when you want notice that an alarm has risen above the threshold you
specified. You specify falling thresholds when you want notice that the network is
behaving normally again. For example, you might specify a falling threshold of 30
collisions per second to indicate a return to acceptable behavior.
When you configure an alarm condition, you must define the following values:
• The monitoring interval over which data is sampled
• The variable to be sampled
• Rising and falling thresholds to detect when network trouble starts and ends
• The event that takes place when a rising threshold is crossed
• The event that takes place when a falling threshold is crossed
- Configuring SNMP 1
- RMON, BootP, DHCP 1
- Contents 5
- 117362-A Rev. A 10
- About This Guide 17
- Before You Begin 18
- Conventions 18
- Acronyms 19
- Bay Networks Customer Service 20
- How to Get Help 21
- Chapter 1 23
- Starting SNMP, RMON, BootP 23
- DHCP, and RARP Services 23
- Starting Configuration Tools 24
- Using Site Manager 25
- Using the BCC 25
- Starting SNMP Services 27
- Starting RMON 28
- Enabling the Ethernet DCM 29
- Customizing the Ethernet DCM 30
- Starting BootP Services 31
- Starting DHCP Services 32
- Enabling DHCP on an Interface 33
- Starting RARP Services 34
- Chapter 2 37
- SNMP, RMON, BootP 37
- DHCP, and RARP Concepts 37
- SNMP Messages 38
- SNMP Communities 39
- SNMP Implementation Notes 40
- 2-6 117362-A Rev. A 42
- Table 2-1. Severity Levels 42
- Thresholds 43
- Threshold Example 43
- 2-8 117362-A Rev. A 44
- RMON Overview 45
- How RMON Works 46
- RMON Architecture 47
- RMON MIB Groups 48
- 117362-A Rev. A 2-13 49
- 2-14 117362-A Rev. A 50
- 117362-A Rev. A 2-15 51
- 2-16 117362-A Rev. A 52
- RMON Interoperability Issues 53
- 2-18 117362-A Rev. A 54
- RMON Applications 55
- RMON Memory Use 56
- 117362-A Rev. A 2-21 57
- 2-22 117362-A Rev. A 58
- 117362-A Rev. A 2-23 59
- 2-24 117362-A Rev. A 60
- 117362-A Rev. A 2-25 61
- BootP Relay Agent Overview 62
- 117362-A Rev. A 2-27 63
- 2-28 117362-A Rev. A 64
- 117362-A Rev. A 2-29 65
- DHCP Overview 66
- 117362-A Rev. A 2-31 67
- 2-32 117362-A Rev. A 68
- 117362-A Rev. A 2-33 69
- 2-34 117362-A Rev. A 70
- 117362-A Rev. A 2-35 71
- RARP Overview 72
- 117362-A Rev. A 2-37 73
- Chapter 3 75
- 3-2 117362-A Rev. A 76
- Disabling and Reenabling SNMP 77
- Specifying a Lock Address 80
- Adding SNMP Communities 83
- Deleting an SNMP Community 86
- Adding a Manager 87
- Deleting a Manager 91
- Specifying a Trap Entity 93
- Disabling a Trap Entity 96
- Configuring Trap Exceptions 97
- Deleting Trap Exceptions 99
- Configuring Thresholds 100
- Customizing SNMP 101
- Adding a Threshold 102
- 3-30 117362-A Rev. A 104
- Specifying Threshold Units 105
- 3-32 117362-A Rev. A 106
- 3-34 117362-A Rev. A 108
- Chapter 4 111
- Customizing a DCM for RMON 111
- 4-2 117362-A Rev. A 112
- 1:dcm_image 113
- Specifying the Boot Option 114
- Saving the Boot Image File 115
- 4-6 117362-A Rev. A 116
- 4-8 117362-A Rev. A 118
- Rebooting the Ethernet DCM 120
- 4-12 117362-A Rev. A 122
- 4-14 117362-A Rev. A 124
- Using Optivity LAN with RMON 125
- 4-16 117362-A Rev. A 126
- Chapter 5 127
- Customizing BootP 127
- 5-2 117362-A Rev. A 128
- 5-4 117362-A Rev. A 130
- BootP Server and the Routers 131
- 5-6 117362-A Rev. A 132
- BOOTREQUEST Packets 133
- 5-8 117362-A Rev. A 134
- 5-10 117362-A Rev. A 136
- 5-12 117362-A Rev. A 138
- 5-14 117362-A Rev. A 140
- 5-16 117362-A Rev. A 142
- Deleting BootP Globally 144
- Chapter 6 145
- Customizing DHCP 145
- 6-2 117362-A Rev. A 146
- Deleting DHCP Globally 148
- Chapter 7 149
- Customizing RARP 149
- 7-2 117362-A Rev. A 150
- 7-4 117362-A Rev. A 152
- Disabling RARP Globally 153
- Deleting RARP Globally 153
- Appendix A 155
- Parameter Descriptions 155
- A-2 117362-A Rev. A 156
- SNMP Global Parameters 157
- 158
- SNMP Community Parameters 159
- SNMP Manager Parameters 160
- 117362-A Rev. A A-7 161
- 164
- 167
- 167
- A-14 117362-A Rev. A 168
- DCM Global Parameters 169
- A-16 117362-A Rev. A 170
- 171
- 171
- BootP and DHCP Parameters 174
- 175
- BootP Address Parameters 176
- A-24 117362-A Rev. A 178
- 117362-A Rev. A A-25 179
- RARP Interface Parameters 181
- RARP Address Parameters 181
- A-28 117362-A Rev. A 182
- Appendix B 183
- Default Parameter Settings 183
- (continued) 184
- RARP Parameters 187
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