ZyXEL Communications ES-100, User Manual

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Chapter 19 IP Source Guard
MES-2110 User’s Guide
145
19.3 DHCP Binding Table
Bindings are used by DHCP snooping and ARP inspection to distinguish between
authorized and unauthorized frames in the network. The MES-2110 learns the
bindings by snooping DHCP frames (dynamic bindings) and from information
provided manually by administrators (static bindings).
Use this screen to manage static bindings for DHCP snooping and ARP inspection.
Static bindings are uniquely identified by the MAC address and VLAN ID. Each MAC
address and VLAN ID can only be in one static binding. If you try to create a static
binding with the same MAC address and VLAN ID as an existing static binding, the
Apply Click Apply to save your changes to the MES-2110’s run-time
memory. The MES-2110 loses these changes if it is turned off or
loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are
done configuring.
DHCP Snooping Status
Action
This shows whether DHCP snooping is enabled or disabled.
DHCP snooping VLAN
Mode This shows whether the MES-2110 forwards DHCP frames of any
VLANs or specific VLANs to DHCP servers.
DHCP Snooping
Option This specifies whether or not the MES-2110 enabled or disabled
adding DHCP relay agent option 82 information to DHCP requests
that the MES-2110 relays to a DHCP server for each VLAN.
Option82 Information This indicates the remote ID of the DHCP relay agent.
DHCP VLAN (Fixed)
This shows the specific VLAN ID.
Trust/Untrust This shows whether the port is trusted or un-trusted.
Table 53 Configuration > IP Source Guard > DHCP > DHCP Snooping Configuration
(continued)
LABEL DESCRIPTION