Dhcp/Bootp Relay; Dhcp/Bootp Relay Commands - Avaya G250 Administration

Configuring the router

DHCP/BOOTP relay

The Avaya G250/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
Note:
protocols.
When there is more than one IP interface on a VLAN, the G250/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 G250/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 G250/G350 with the relay address on that subnet so the DHCP/BOOTP server can accept
the request.
DHCP/BOOTP Relay in G250/G350 is configurable per VLAN and allows for two DHCP/
BOOTP servers to be specified. In this case, the G250/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 G250/G350.

DHCP/BOOTP relay commands

Use the following commands to configure DHCP relay and BOOTP relay:
Use the ip bootp-dhcp network command to select the network from which the
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BOOTP/DHCP server should allocate an address. This command is required only when
there are multiple IP interfaces over the VLAN. Use the no form of this command to
restore the default value. You must be in interface context to use this command.
Use the ip bootp-dhcp relay command to enable relaying of BOOTP and DHCP
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requests to the BOOTP/DHCP server. Use the no form of this command to disable
relaying of BOOTP and DHCP requests. You must be in general context to use this
command.
Use the ip bootp-dhcp server command to add a BOOTP/DHCP server to handle
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BOOTP/DHCP requests received by this interface. A maximum of two servers can be
added to a single interface. Use the no form of this command to remove a server. You
must be in interface context to use this command.
332 Administration for the Avaya G250 and Avaya G350 Media Gateways