Dhcp/Bootp Relay - Avaya G250 Administration

Media gateways

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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

The same DHCP/BOOTP relay agent serves both the BOOTP and DHCP

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.

Configuring DHCP and BOOTP relay

Issue 3 February 2007