R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

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Application of trusted and untrusted ports
Configuring a trusted port connected to a DHCP server
Figure 32 Configuring trusted and untrusted ports
Configuring trusted ports in a cascaded network
In a cascaded network as shown in Figure 33, each DHCP snooping device's ports connected to other
DHCP snooping devices should be configured as trusted ports.
To save system resources, you can disable the trusted ports that are not directly connected to DHCP
clients from recording client IP-to-MAC bindings (DHCP snooping entries) upon receiving DHCP requests.
Figure 33 Configuring trusted ports in a cascaded network