Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE 26.1.x

Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE 26.1.x

DHCP Option82

Outlines the functions and security benefits of DHCP Option 82, describes its suboptions and relay agent information, and details controller configuration options for including network-specific identifiers and enabling address allocation based on topology or client characteristics. Outlines global DHCP Option 82 configuration using server override settings and different SVIs, including relay agent information setup, link selection suboption enablement, and use of specified source interfaces for DHCP message relaying. Outlines procedures for configuring DHCP Option 82 on VLAN interfaces and SVIs using commands such as option-insert, server-ID-override, and subscriber-ID, including steps for VLAN and SVI setup, suboption configuration, IP assignment, UDP relay settings, and disabling MOP features for DHCP relay control. Explains how to configure and verify DHCP Option 82 support for access points operating in FlexConnect local switching mode.