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ProSafe M5300 Switch
DHCP Snooping Interface Configuration
To display the DHCP Snooping Interface Configuration page, click Security Control> DHCP
Snooping
Interface Configuration.
To configure interfaces for DHCP snooping:
1. Select the check box associated with each interface to configure. To apply the same
settings to all interfaces, select the check box in the header row.
2. If Trust Mode is enabled, DHCP snooping application considers as port trusted. DHCP
servers must be reached through trusted ports.The factory default is disabled. If the trust
mode is disabled (untrusted), DHCP snooping enforces the following security rules:
• DHCP packets from a DHCP server (DHCPOFFER, DHCPACK, DHCPNAK,
DHCPRELEASEQUERY) are dropped if they are received on an untrusted port.
• DHCPRELEASE and DHCPDECLINE messages are dropped if the MAC addresses
in the snooping database, but the binding's interface is other than the interface where
the message was received.
• On untrusted interfaces, the switch drops DHCP packets with a source MAC address
that does not match the client hardware address if MAC Address Validation is globally
enabled.
3. If Logging Invalid Packets is enabled, DHCP snooping application logs invalid packets on
this interface. The factory default is disabled.
4. Use Rate Limit (pps) to specify rate limit value for DHCP Snooping purpose. If the incoming
rate of DHCP packets exceeds the value of this object for consecutively burst interval
seconds, the port will be shutdown. If this value is None there is no limit. The factory default
is 15pps (packets per second). The range of Rate Limit is (0 to 300).
5. Use Burst Interval (secs) to specify the burst interval value for rate limiting purpose on this
interface. If the rate limit is None burst interval has no meaning shows it as N/A. The factory
default is 1 second. The range of Burst Interval is 1 to 15).
6. Click APPLY to apply the new configuration and cause the changes to take effect. These
changes will not be retained across a power cycle unless a save configuration is performed.
7. Click CANCEL to abandon the changes.