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Configuring SNMP, BootP, and DHCP Services
2-2
308644-15.1 Rev 00
SNMP Overview
SNMP is a simple request/response protocol that communicates management
information between two types of SNMP software entities: SNMP applications
(also called SNMP managers) and SNMP agents.
SNMP applications contain manager software that runs on a network management
station (also known as an SNMP client), such as a PC or a workstation. The
manager software implements the protocols used to exchange data with SNMP
agents. SNMP applications issue queries to gather information about the status,
configuration, and performance of external network devices, called network
elements in SNMP terminology. Network elements contain an agent and perform
the network management function that the network management stations request.
The Nortel Networks Site Manager software is an example of a network
management station, and the Nortel Networks Backbone Node (BN
*
) router is an
example of a network element.
The SNMP agent is a software entity that responds to information and action
request messages (SNMP get and set requests) sent by a network management
station (your Site Manager workstation). The messages exchanged between
manager and router SNMP agents enable you to access and manage objects in an
active or inactive (stored) management information base (MIB) on a router.
The agents also send unsolicited reports (called traps) back to the network
management station when certain network activity occurs. An example of a trap is
an overload condition as defined by the packet load’s crossing some threshold.
You use the management station to configure, monitor, and receive trap messages
from other network devices configured as SNMP agents. The management station
can get and set objects in the agents and can receive traps from the agents. The
management station, therefore, has the capability to “manage” a number of
agents.
SNMP Messages
SNMP managers and network elements communicate with each other by sending
SNMP messages (Figure 2-1
).
- Configuring SNMP, BootP 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308644-15.1 Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- Hard-Copy Technical Manuals 18
- How to Get Help 19
- Chapter 1 21
- Starting Configuration Tools 22
- Starting SNMP Services 25
- Starting BootP Services 26
- Starting BootP/DHCP Relay 27
- Starting a DHCP Server 29
- Chapter 2 33
- SNMP Overview 34
- Figure 2-1. Role of SNMP 35
- SNMP Communities 36
- SNMP Implementation Notes 37
- Table 2-1. Severity Levels 38
- Thresholds 39
- Threshold Example 40
- BootP Relay Agent Overview 42
- DHCP Overview 46
- Dynamic IP Address Allocation 47
- DHCP Components 48
- DHCP Server Implementation 55
- Chapter 3 61
- Customizing SNMP 61
- Disabling and Reenabling SNMP 63
- Specifying a Lock Address 66
- Adding SNMP Communities 69
- Deleting an SNMP Community 72
- Adding a Manager 73
- Deleting a Manager 77
- View Index View Name 81
- Disabling a Trap Entity 87
- Configuring Trap Exceptions 88
- Deleting Trap Exceptions 90
- Configuring Thresholds 91
- Adding a Threshold 93
- Specifying Threshold Units 96
- Chapter 4 101
- Customizing BootP 101
- Using the BCC 102
- Enabling ARP Cache Support 103
- Using Site Manager 104
- ) and enter: 113
- Deleting BootP Globally 129
- Chapter 5 131
- Customizing BootP/DHCP Relay 131
- Defining DHCP Servers 133
- Chapter 6 137
- Customizing the DHCP Server 137
- Specifying the Debug Level 147
- Deleting DHCP Globally 151
- Appendix A 153
- Caution: 154
- SNMP Global Parameters 155
- SNMP Community Parameters 157
- SNMP Manager Parameters 158
- BootP and DHCP Parameters 168
- BootP Address Parameters 171
- DHCP Server Global Parameters 176
- Appendix B 181
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