Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Instrukcja Użytkownika Strona 49
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SNMP, BootP, DHCP, and RARP Concepts
303542-A Rev 00
2-19
The client examines the configuration parameters in the DHCPACK packet
and records the duration of the lease period. If the client detects a problem
with the configuration parameters, it sends a DHCPDECLINE packet to the
server and issues a new DHCPDISCOVER packet. Otherwise, the client
accepts the configuration parameters.
• If the target server cannot supply the requested configuration parameters, it
sends a DHCPNAK packet to the client through the BootP relay agent.
When the client receives the DHCPNAK packet, it broadcasts a new
DHCPDISCOVER packet and the process begins again.
A client may choose to relinquish its IP address before the lease period expires by
sending a DHCPRELEASE packet to the server. This packet contains the
relinquished IP address in the client IP address field and the client’s MAC address
in the client hardware address field.
Acquiring the Same IP Address Again
A client may want to reuse an IP address that a server allocated earlier by DHCP.
In this case, the interchange between client and server omits some of the steps
described in the previous section, and proceeds as follows:
1. The client starts the interchange by broadcasting a DHCPREQUEST packet
that contains its previous IP address in the client IP address field.
2. The BootP relay agent forwards the packet to DHCP servers on other
networks.
3. DHCP servers examine the client’s configuration parameters in the options
field of the DHCPREQUEST packet.
4. The server that originally supplied the configuration parameters recognizes
them and responds with a DHCPACK packet.
5. When a client receives a DHCPACK packet, it accepts or declines the
parameters, as it would when receiving a new IP address.
If a client’s request is invalid (for example, when the client has moved to a new
network), servers respond with a DHCPNAK packet. If a client receives only
DHCPNAK packets, it must request a new IP address by broadcasting a
DHCPDISCOVER packet.
- 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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