Table 181: GARP Port Configuration Fields (continued)
Field
Description
Leave Timer (Centisecs)
The amount of time to wait after receiving an unregister request for a VLAN or
multicast group before deleting the associated entry. This timer allows time for
another station to assert registration for the same attribute in order to maintain
uninterrupted service.
Leave All Timer (Centisecs)
The amount of time to wait before sending a LeaveAll PDU after the GARP
application has been enabled on the interface or the last LeaveAll PDU was sent.
A LeaveAll PDU indicates that all registrations will shortly be deregistered.
Participants will need to rejoin in order to maintain registration.
Click
Refresh
to refresh the page with the most current data from the switch.
Configuring DHCP Snooping
snooping is a security feature that monitors DHCP messages between a DHCP client and DHCP
servers to filter harmful DHCP messages and to build a bindings database of {MAC address, IP address,
VLAN ID, port} tuples that are considered authorized. You can enable DHCP snooping globally and on
specific VLANs, and configure ports within the VLAN to be trusted or untrusted. If a DHCP message
arrives on an untrusted port, DHCP snooping filters messages that are not from authorized DHCP
clients. DHCP server messages are forwarded only through trusted ports.
Global DHCP Snooping Configuration
Use the Global DCHP Snooping Configuration page to view and configure the global settings for
Snooping.
To access this page, click
Switching
>
DCHP Snooping
>
Base
>
Global
in the navigation menu.
Table 182: Global DHCP Snooping Configuration Fields
Field
Description
DHCP Snooping Mode
The administrative mode of DHCP snooping on the device.
MAC Address Validation
Enables or disables the verification of the sender MAC address for DHCP
snooping. When enabled, the device checks packets that are received on
untrusted interfaces to verify that the MAC address and the DHCP client
hardware address match. If the addresses do not match, the device drops the
packet.
Click
Refresh
to refresh the page with the most current data from the switch.
DHCP Snooping VLAN Configuration
Use the DHCP Snooping VLAN Configuration page to view and configure the
snooping settings
on VLANs that exist on the device. DHCP snooping can be configured on switching VLANs and routing
VLANs. For Layer 2 (non-routing) VLANs, DHCP snooping forwards valid DHCP client messages
received on the VLANs. The message is forwarded on all trusted interfaces in the VLAN. When a DHCP
packet is received on a routing VLAN, the DHCP snooping application applies its filtering rules and
Configuring Switching Information
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