Figure 93: Creating a TTG+PDG forwarding profile
About DHCP Relay
The controller can function as a DHCP relay agent that improves network performance by
converting DHCP broadcast traffic to unicast to prevent flooding the Layer 2 network (when
Layer 3 Tunnel Mode is enabled, DHCP relay only applies to Tunnel Mode WLANs.)
Typically, when mobile stations acquire IP addresses through DHCP, the DHCP request and
acknowledgment traffic is broadcast to all devices in the same Layer 2 environment. With Tunnel
Mode WLANs, this traffic flood is wasteful in terms of bandwidth and computing power.
When DHCP Relay is enabled in a forwarding service profile, the data plane relay agent converts
DHCP Discover/Request traffic to unicast UDP packets and sends them to the DHCP servers,
then delivers DHCP Offer/Ack messages from the DHCP server back to the client. The data
plane adds option-82 and sends a message to the configured DHCP server. If option-82 is
received from the AP, the data plane does not overwrite the configuration and sends a message
to the server.
SmartCell Gateway 200/Virtual SmartZone High-Scale for Release 3.4.1 Administrator Guide
197
Configuring Services and Profiles
Working with Profiles
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