Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario Pagina 52
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Configuring SNMP, BootP, DHCP, and RARP Services
2-22
117362-C Rev 00
The packet relay process uses these fields as follows:
1.
The BootP relay agent receives the packet and, if it accepts the packet,
transmits it to DHCP servers on other networks.
2.
DHCP servers on the local segment see the broadcast packet and respond with
a DHCPOFFER packet that includes an available IP address and other
configuration information. Before offering the IP address, the DHCP servers
may generate an ARP or ICMP echo request on the network to determine
whether the IP address is already in use by another device.
3.
When a DHCP server offers an IP address, that address is temporarily
unavailable to other clients. If the client does not accept or reject the address
within a certain period of time, the server reclaims it. The address is then
available for other clients.
4.
The BootP relay agent receives the DHCPOFFER packet and examines the
packet. If the BootP relay agent accepts the packet, it forwards it to the client.
5.
If a client does not receive a DHCPOFFER packet within a specified amount
of time after broadcasting a DHCPDISCOVER packet, it sends the packet
again. The client may rebroadcast the packet a number of times. However,
clients operating on systems running Windows 95 broadcast 4
DHCPDISCOVER packets, each two seconds apart.
6.
The client may receive DHCPOFFER packets from several potential servers.
If you configure the client to wait for multiple responses, it compares
configuration parameters in the DHCPOFFER packets to decide which server
to target.
Server name 64 Optional DHCP server host name, represented as
a null terminated string.
File name 128 A boot file name. Represented as a null terminated
string in a DHCPDISCOVER message, and a fully
qualified directory path name in a DHCPOFFER
message.
Options 312 Variable length optional parameters field.
Field Octets Description
- Configuring SNMP 1
- BootP, DHCP, and RARP 1
- Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117362-C 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 22
- Using Site Manager 23
- Starting BootP Services 24
- Starting BootP/DHCP Relay 26
- Starting a DHCP Server 27
- Starting RARP Services 29
- Chapter 2 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
- Dynamic IP Address Allocation 45
- DHCP Components 46
- DHCP Server Implementation 48
- IP network 49
- RARP Overview 59
- 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
- Specifying a Trap Entity 79
- Disabling a Trap Entity 82
- Configuring Trap Exceptions 83
- Deleting Trap Exceptions 85
- Configuring Thresholds 86
- Adding a Threshold 88
- Specifying Threshold Units 91
- Chapter 4 97
- (continued) 100
- Customizing BootP 101
- (continued) 106
- Deleting BootP Globally 114
- Customizing BootP/DHCP Relay 115
- Chapter 5 115
- BootP Relay Agent 116
- Defining DHCP Servers 117
- Chapter 6 121
- Customizing the DHCP Server 121
- Specifying the Debug Level 128
- Deleting DHCP Globally 130
- Chapter 7 131
- Customizing RARP 131
- Customizing RARP Parameters 132
- Disabling RARP Globally 135
- Deleting RARP Globally 135
- Appendix A 137
- SNMP, BootP, DHCP, and RARP 137
- Parameter Descriptions 137
- Caution: 138
- SNMP Global Parameters 139
- SNMP Community Parameters 141
- SNMP Manager Parameters 142
- BootP and DHCP Parameters 152
- BootP Address Parameters 154
- DHCP Global Parameters 160
- RARP Interface Parameters 164
- RARP Address Parameters 164
- Appendix B 167
- Default Parameter Settings 167
- RARP Parameters 171
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