D-Link DES-3550 Product Manual - Page 150
DHCP/BOOTP Relay, DHCP / BOOTP Relay Global Settings
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xStack® DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual Gratuitous ARP Learning This is used to enable/disable updating ARP cache based on the received gratuitous ARP packet. If a switch receives a gratuitous ARP packet and the sender's IP address in its ARP table, it should update the ARP entry. This is Enabled by default. Gratuitous ARP Trap & Log The switch can trap and log IP conflict events to inform the administrator. By default, trap is Disabled and event log is Enabled. Gratuitous ARP Periodical Send Interval This is used to configure the interval for the periodical sending of gratuitous ARP request packets. By default, the interval is 0. After making the desired changes, click Apply to implement the new Gratuitous ARP Table entry. DHCP/BOOTP Relay The relay hops count limit allows the maximum number of hops (routers) that the DHCP/BOOTP messages can be relayed through to be set. If a packet's hop count is more than the hop count limit, the packet is dropped. The range is between 1 and 16 hops, with a default value of 4. The relay time threshold sets the minimum time (in seconds) that the Switch will wait before forwarding a BOOTREQUEST packet. If the value in the second field of the packet is less than the relay time threshold, the packet will be dropped. The range is between 0 and 65535 seconds, with a default value of 0 seconds. DHCP / BOOTP Relay Global Settings To enable and configure DHCP/BOOTP Relay Global Settings on the Switch, click Configuration > Layer 3 IP Networking > DHCP/BOOTP Relay > DHCP/BOOTP Relay Global Settings: Figure 6- 120. DHCP/ BOOTP Relay Global Settings window The following fields can be set: Parameter Description Relay State Relay Hops Count Limit (1-16) Relay Time Threshold (0-65535) DHCP Agent Information Option 82 State This field can be toggled between Enabled and Disabled using the pull-down menu. It is used to enable or disable the DHCP/BOOTP Relay service on the Switch. The default is Disabled This field allows an entry between 1 and 16 to define the maximum number of router hops DHCP/BOOTP messages can be forwarded across. The default hop count is 4. Allows an entry between 0 and 65535 seconds, and defines the maximum time limit for routing a DHCP/BOOTP packet. If a value of 0 is entered, the Switch will not process the value in the seconds field of the BOOTP or DHCP packet. If a non-zero value is entered, the Switch will use that value, along with the hop count to determine whether to forward a given BOOTP or DHCP packet. This field can be toggled between Enabled and Disabled using the pull-down menu. It is used to enable or disable the DHCP Agent Information Option 82 on the Switch. The default is Disabled. 135