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TRENDnet User's Guide
⚫
The source MAC address and source IP address in the packet do not match any of
the current bindings.
⚫
The packet is a RELEASE or DECLINE packet, and the source MAC address and
source port do not match any of the current bindings.
⚫
The rate at which DHCP packets arrive is too high.
DHCP Snooping Database
The Switch stores the binding table in volatile memory. If the Switch restarts, it loads
static bindings from permanent memory but loses the dynamic bindings, in which case
the devices in the network have to send DHCP requests again.
Configuring DHCP Snooping
Follow these steps to configure DHCP snooping on the Switch.
1.
Enable DHCP snooping on the Switch.
2.
Enable DHCP snooping on each VLAN.
3.
Configure trusted and untrusted ports.
4.
Configure static bindings.
Note:
The Switch will drop all DHCP requests if you enable DHCP snooping and there are
no trusted ports.
If the port link down, the entries learned by this port in the DHCP snooping
binding table will be deleted.
You must enable the global DHCP snooping and DHCP Snooping for vlan first.
The main purposes of the DHCP Snooping are:
1.
Create and maintain binding table for ARP Inspection function.
2.
Filter the DHCP server's packets that the DHCP server connects to an untrusted
port.
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The DHCP server connected to an un-trusted port will be filtered.
Default Settings
The DHCP snooping on the Switch is disabled.
The DHCP snooping is enabled in VLAN(s): None.
Maximum
Port
Trusted Host Count
Port
-----
---------- ---------------
-----
1
no
32
2
3
no
32
4
5
no
32
6
7
no
32
8
9
no
32
10
11
no
32
12
13
no
32
14
15
no
32
16
Notices
⚫
There are a global state and per VLAN states.
When the global state is disabled, the DHCP Snooping on the Switch is disabled
even per VLAN states are enabled.
When the global state is enabled, user must enable per VLAN states to enable the
DHCP Snooping on the specific VLAN.
Managed Industrial L2 Switch
Maximum
Trusted Host Count
---------- ---------------
no
32
no
32
no
32
no
32
no
32
no
32
no
32
no
32
101
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