Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Manual do Utilizador Página 81

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Configuring BOOTP Services
114070 Rev. A 3-3
The client transmits a BOOTREQUEST packet to the IP limited broadcast address
(255.255.255.255). The router receives the BOOTREQUEST packet at an
interface that you configured to receive BOOTREQUEST packets (an input
interface). If the BOOTREQUEST packet has an address other than
255.255.255.255, the router drops the packet.
F
igure 3-3 shows the fields in the BOOTREQUEST and BOOTREPLY packets.
Figure 3-3. BOOTREQUEST and BOOTREPLY Fields
The packet relay process uses these fields as follows:
1. When a router interface receives a BOOTREQUEST packet, the router
examines the seconds and hops fields in the packet and compares these values
to BOOTP parameters you configured on that interface.
The seconds field contains the minimum number of seconds that the router
waits before forwarding a BOOTREQUEST packet. If the value in the
seconds field of the packet is less than the value of the Timeout Secs.
parameter you configured on the interface, the router drops the packet.
Transaction ID (4)
Seconds (2)
Flags (2)
Client IP address (4)
Your IP address (4)
Server IP address (4)
Gateway IP address (16)
Client hardware address (16)
Server name (64)
File name (128)
Options (312)
Operation (1)
*
Hardware type (1)
Hardware address
length (1) Hops (1)
*
The number in parentheses indicates the number of octets in each field.
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