Dhcp/Bootp Relay; Dhcp/Bootp Relay Commands - Avaya G350 Administration

Configuring the router
Configuring DHCP and BOOTP relay
BOOTP allows the workstation to boot without requiring a hard disk or diskette drive. It is used when the
user or station location changes frequently. The protocol is defined by RFC 951.

DHCP/BOOTP relay

The Avaya G350 Media Gateway supports the DHCP/BOOTP relay agent function. This is an application
that accepts DHCP/BOOTP requests that are broadcast on one VLAN. The application sends them to a
DHCP/BOOTP server. That server connects to another VLAN or a server that might be located across
one or more routers that might otherwise not get the broadcast request. The relay agent handles the
DHCP/BOOTP replies as well. The relay agent transmits the replies to the client directly or as broadcast,
according to a flag in the reply message.
NOTE:
The same DHCP/BOOTP relay agent serves both the BOOTP and DHCP protocols.
When there is more than one IP interface on a VLAN, the G350 chooses the lowest IP address on this
VLAN when relaying DHCP/BOOTP requests. The DHCP/BOOTP server then uses this address to
decide the network from which to allocate the address. When there are multiple networks configured, the
G350 performs a round-robin selection process.
When the DHCP/BOOTP server is configured to allocate addresses only from a single subnetwork
among the different subnetworks defined on the VLAN, you might need to configure the G350 with the
relay address on that subnet so the DHCP/BOOTP server can accept the request.
DHCP/BOOTP Relay in G350 is configurable per VLAN and allows for two DHCP/BOOTP servers to
be specified. In this case, the G350 duplicates each request, and sends it to both servers. This duplication
provides redundancy and prevents the failure of a single server from blocking hosts from loading. You
can enable or disable DHCP/BOOTP Relay in G350.

DHCP/BOOTP relay commands

Use the following commands to configure DHCP relay and BOOTP relay:
•
Use the
server should allocate an address. This command is required only when there are multiple IP
interfaces over the VLAN. Use the
must be in interface context to use this command.
•
Use the
BOOTP/DHCP server. Use the
DHCP requests. You must be in general context to use this command.
•
Use the
BOOTP/DHCP requests received by this interface. A maximum of two servers can be added to a
single interface. Use the
context to use this command.
144
command to select the network from which the BOOTP/DHCP
ip bootp-dhcp network
command to enable relaying of BOOTP and DHCP requests to the
ip bootp-dhcp relay
form of this command to disable relaying of BOOTP and
no
command to add a BOOTP/DHCP server to handle
ip bootp-dhcp server
no form of this command to remove a server. You must be in interface
form of this command to restore the default value. You
no
Administration of the Avaya G350 Media Gateway
June 2004