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IPv4 Management and Interfaces
292 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
17
DHCP Snooping Binding Database
See How the DHCP Snooping Binding Database is Built for a description of how
dynamic entries are added to the DHCP Snooping Binding database.
Note the following points about maintenance of the DHCP Snooping Binding
database:
• The device does not update the DHCP Snooping Binding database when a
station moves to another interface.
• If a port is down, the entries for that port are not deleted.
• When DHCP Snooping is disabled for a VLAN, the binding entries that were
collected for that VLAN are removed.
• If the database is full, DHCP Snooping continue to forward packets but new
entries are not created. Note that if the IP source guard and/or ARP
inspection features are active, the clients that are not written in the DHCP
Snooping Binding database are not be able to connect to the network.
To add entries to the DHCP Snooping Binding database:
STEP 1 Click IP Configuration > IPv4 Management and Interfaces > DHCP Snooping/
Relay > DHCP Snooping Binding Database.
To see a subset of entries in the DHCP Snooping Binding database, enter the
relevant search criteria and click Go.
The fields in the DHCP Snooping Binding Database are displayed. These are
described in the Add page, except for the IP Source Guard field:
• Status—
- Active—IP Source Guard is active on the device.
- Inactive—IP Source Guard is not active on the device.
• Reason—
- No Problem
- No Resource
- No Snoop VLAN
- Trust Por t
STEP 2 To add an entry, click Add.