Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál Strana 67

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Configuring BOOTP Services
2-5
If the flag field contains the value 1, the client does not know its own IP
address. The router broadcasts the BOOTREPLY packets to the IP limited
broadcast address (255.255.255.255).
If the flag 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.
Implementation Notes
Bear the following issues in mind when you configure BOOTP services for the
router.
Setting the Router Mode
You must configure the router in forwarding mode for the BOOTP relay agent to
operate. For instructions on configuring the router in forwarding mode, refer to
Configuring IP Services.
Specifying a Forwarding Route for BOOTREQUEST Packets
You must define forwarding routes for BOOTREQUEST packets, using one or
both of the following methods:
Defining a relationship between an input interface and an output interface on
the router (refer to “Specifying Interfaces That Receive and Relay BOOTP
Packets,” later in this chapter)
Defining a relationship between an input interface and a BOOTP server (refer
to “Specifying Servers for BOOTP Services,” later in this chapter)
Filtering BOOTP and DHCP Packets
The Dynamic Host Configuration Protocol (DHCP) also uses the BOOTP relay
agent to forward packets. Refer to Chapter 3 for further information on DHCP. To
reduce network traffic, you may want to control whether an interface transmits
BOOTP packets, DHCP packets, or both BOOTP and DHCP packets. For
example, you may want to set a filter to prevent BOOTP traffic from traversing a
network segment that contains DHCP servers but not BOOTP servers.
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