H3C S9500 Series Operation Manual page 186

Operation Manual – Network Protocol
H3C S9500 Series Routing Switches
Remove
configured for DHCP address pools of
multiple VLAN interfaces
If you execute the dhcp server option command multiple times, the newly configured
option overwrites the existing one.
4.3.10 Configuring Outbound Gateway Address for DHCP Clients
An outbound gateway enables DHCP clients to access external network devices.
Packets destined for external networks are forwarded by outbound gateways. At
present, you can configure up to eight IP addresses for outbound gateways.
Perform the following configuration in DHCP address pool view.
Table 4-28 Configure outbound gateway address for DHCP clients
Configure
gateway addresses for DHCP clients
Remove one or all outbound gateway
addresses configured for DHCP clients
By default, no outbound gateway address is configured for DHCP clients.
If you execute the gateway-list command multiple times, the newly configured IP
addresses overwrite the existing ones.
4.3.11 Configuring Parameters for DHCP Server to Send Ping Packets
To avoid address conflict caused by reassigning an in-use IP address, before assigning
an IP address to a DHCP client, the DHCP server detects the network using the ping
instructions to ensure the IP address is not occupied. The DHCP server determines
whether an IP address is reachable by sending specified number of ping packets. It
waits for response packet for a specified period after sending each of these packets. If
the DHCP server receives no response after sending all these packets, it considers the
IP address is not used by other devices in this network and assigns the IP address to
this DHCP client. Otherwise, it does not assign the IP address.
Perform the following configuration in system view.
Operation
a custom DHCP
Operation
one or more outbound
option undo dhcp
{ interface vlan-interface vlan-id [ to
vlan-interface vlan-id ] | all }
gateway-list ip-address [ ip-address ]
undo gateway-list { ip-address | all }
4-18
Chapter 4 DHCP Configuration
Command
server option
Command
code