Avaya Configuring BOOTP Services Instrukcja Użytkownika Strona 53
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SNMP, BootP, BootP/DHCP Relay, and DHCP Server Concepts
308644-15.1 Rev 00
2-21
Requesting and Receiving IP Information
Figure 2-7
shows the next stage of the process for acquiring a new IP address from
a router configured as a BootP relay agent:
Figure 2-7. Requesting and Receiving IP Information (BootP Relay Agent)
1.
When the client has chosen a target server, it broadcasts a DHCPREQUEST
packet. The DHCPREQUEST packet contains the address of the target server
in the server IP address field and the lease offer that it prefers.
2.
The router configured as a BootP relay agent receives the packet and forwards
it to all servers.
3.
Those servers examine the packet, and if their IP addresses differ from the
value in the server IP address field, they reclaim the IP addresses that they
supplied in the DHCPOFFER packets. These addresses are now available for
other clients.
Accepting or Declining IP Information
In a network configuration in which a router is configured as a BootP/DHCP relay
agent, the target server recognizes its IP address in the server IP address field, and
responds to the DHCPREQUEST packet as follows:
• If the target server can supply the requested configuration parameters, it sends
a DHCPACK packet to the client through the BootP relay agent. The
DHCPACK packet contains the committed IP address.
3. Target server transmits
DHCPACK or DHCPNAK
packet to BootP relay
agent.
1. Client broadcasts
a DHCPREQUEST
packet.
4. BootP relay agent
transmits DHCPACK
or DHCPNAK
packet to client.
2. BootP relay agent
transmits DHCPREQUEST
packet to all servers
that supplied a
DHCPOFFER packet.
Router (BootP
relay agent)
SNM0006A
DHCP
server
DHCP
client
- 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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