R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

198
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable offline detection.
dhcp relay client-detect enable Disabled by default.
NOTE:
Removing an ARP entry manually does not remove the corresponding client’s IP-to-MAC bindin
g
. When
the client goes offline, use the undo dhcp relay security command to remove the IP-to-MAC binding
manually.
Configuring the DHCP relay agent to release an IP address
You can configure the relay agent to release a client’s IP address. The relay agent sends a
DHCP-RELEASE message that contains the specified IP address. Upon receiving the DHCP-RELEASE
message, the DHCP server releases the IP address; meanwhile, the client entry is removed from the DHCP
relay agent.
To configure the DHCP relay agent to send DHCP-RELEASE messages:
Ste
p
Command
1. Enter system view.
system-view
2. Configure the DHCP relay agent to release an IP
address.
dhcp relay release ip client-ip
NOTE:
• The IP address to be released must be available in a dynamic client entry.
• Dynamic client entries can be
g
enerated only after you enable address check on the DHCP relay a
g
ent.
Configuring the DHCP relay agent to support Option 82
1. Configuration prerequisites
Before performing this configuration, complete the following tasks:
• Enabling DHCP
• Enabling the DHCP relay agent on the specified interface
• Correlating a DHCP server group with relay agent interfaces
2. Configuration procedure
To configure the DHCP relay agent to support Option 82:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A