Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manuel d'utilisateur Page 44
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Configuring SNMP, BootP, DHCP, and RARP Services
2-14
303542-A Rev 00
• If the flags field contains the value 0, the client knows its own IP address,
which appears in the client IP address field of the BOOTREPLY packet.
The router sends the BOOTREPLY packet to that IP address and the
link-layer address that appears in the client hardware address field.
DHCP Overview
DHCP is an extension of BootP and is also built on the client-server model. DHCP
provides a method for dynamically assigning IP addresses and configuration
parameters to other IP hosts or clients in an IP network. DHCP is specifically
designed for servers in large network environments and complex TCP/IP software
configurations.
DHCP allows a host to automatically allocate reusable IP addresses and additional
configuration parameters for client operation, and allows the client-server host to
configure parameters not directly related to the IP protocol. This feature allows
the host to exchange packets with any other host on the network.
DHCP enables clients to obtain an IP address for a fixed length of time (a lease
period) from remote servers (DHCP servers). Groups of hosts that do not need
permanent IP addresses can lease an address from a limited pool of addresses. The
lease period can range from 1 minute to 99 years. When the lease period expires,
the server can assign the IP address to another client on the network. DHCP also
enables clients to acquire the IP configuration parameters they need to
communicate on a network.
The DHCP packet format is based on a BootP packet. As a result, DHCP uses the
BootP relay agent to forward DHCP packets. This scheme provides
interoperability between the existing BootP clients and DHCP servers. The BootP
relay agent uses the same criteria and methods for forwarding both DHCP and
BootP packets. For information about the packet relay process, see “BootP Relay
Agent Overview,” on page 2-10.
- 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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