R0106-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V7)

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Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure the aging time for
MAC address check entries.
dhcp relay check mac-address
aging-time time
The default aging time is 30
seconds.
This command takes effect only
after you execute the dhcp relay
check mac-address command.
3. Enter the interface view.
interface interface-type
interface-number
N/A
4. Enable MAC address check.
dhcp relay check mac-address
By default, MAC address check
is disabled.
Configuring the DHCP relay agent to release an IP
address
Configure the relay agent to release the IP address for a relay entry. The relay agent sends a
DHCP-RELEASE message to the server and meanwhile deletes the relay entry. Upon receiving the
DHCP-RELEASE message, the DHCP server releases the IP address.
To configure the DHCP relay agent to release an IP address:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure the DHCP relay
agent to release an IP address.
dhcp relay release ip client-ip
[ vpn-instance vpn-instance-name ]
This command can release only the
IP addresses in the recorded relay
entries.
Configuring Option 82
Follow these guidelines when you configure Option 82:
• To support Option 82, you must perform related configuration on both the DHCP server and relay
agent. For DHCP server Option 82 configuration, see "Enabling handling of Option 82."
• The
device name (sysname) must not include spaces if it is configured as the padding content for
sub-option 1. Otherwise, the DHCP relay agent will fail to add or replace Option 82.
To configure 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
3. Enable the relay agent to handle
Option 82.
dhcp relay information enable
By default, handling of
Option 82 is disabled.