HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 54

Configuring DHCP client, Configuration restrictions, Enabling the DHCP client on an interface

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Configuring DHCP client With DHCP client enabled, an interface uses DHCP to obtain configuration parameters such as an IP address from the DHCP server. Configuration restrictions • The DHCP client configuration is supported only on VLAN interfaces. • When multiple VLAN interfaces with the same MAC address use DHCP for IP address acquisition via a relay agent, the DHCP server cannot be a Windows Server 2000 or Windows Server 2003. Enabling the DHCP client on an interface Follow these guidelines when you enable the DHCP client on an interface: • An interface can be configured to acquire an IP address in multiple ways. The latest configuration overwrites the previous one. • Secondary IP addresses cannot be configured on an interface that is enabled with the DHCP client. • If the IP address that interface A obtains from the DHCP server is on the same network segment as the IP address of interface B, interface A neither uses the IP address nor requests any IP address from the DHCP server unless you do the following: Delete the IP address of interface B and bring up interface A again by first executing the shutdown command and then the undo shutdown command, or, re-enable the DHCP client on interface A by executing the undo ip address dhcp-alloc command and then the ip address dhcp-alloc command. To enable the DHCP client on an interface: Step Command 1. Enter system view. system-view 2. Enter interface view. interface interface-type interface-number 3. Enable the DHCP client on the ip address dhcp-alloc [ client-identifier mac interface. interface-type interface-number ] Remarks N/A N/A Disabled by default Setting the DSCP value for DHCP packets An IPv4 packet header contains an 8-bit Type of Service (ToS) field. As defined in RFC 2474, the first six bits set the Differentiated Services Code Point (DSCP) value, and the last two bits are reserved. Network devices use the DSCP value as a reference to determine the packet priority for transmission. To set the DSCP value for DHCP packets: Step 1. Enter system view. Command system-view Remarks N/A 46

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46
Configuring DHCP client
With DHCP client enabled, an interface uses DHCP to obtain configuration parameters such as an IP
address from the DHCP server.
Configuration restrictions
•
The DHCP client configuration is supported only on VLAN interfaces.
•
When multiple VLAN interfaces with the same MAC address use DHCP for IP address acquisition
via a relay agent, the DHCP server cannot be a Windows Server 2000 or Windows Server 2003.
Enabling the DHCP client on an interface
Follow these guidelines when you enable the DHCP client on an interface:
•
An interface can be configured to acquire an IP address in multiple ways. The latest configuration
overwrites the previous one.
•
Secondary IP addresses cannot be configured on an interface that is enabled with the DHCP client.
•
If the IP address that interface A obtains from the DHCP server is on the same network segment as
the IP address of interface B, interface A neither uses the IP address nor requests any IP address from
the DHCP server unless you do the following: Delete the IP address of interface B and bring up
interface A again by first executing the
shutdown
command and then the
undo shutdown
command, or, re-enable the DHCP client on interface A by executing the
undo ip address
dhcp-alloc
command and then the
ip address dhcp-alloc
command.
To enable the DHCP client on an interface:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type interface-number
N/A
3.
Enable the DHCP client on the
interface.
ip address dhcp-alloc
[
client-identifier
mac
interface-type
interface-number
]
Disabled by default
Setting the DSCP value for DHCP packets
An IPv4 packet header contains an 8-bit Type of Service (ToS) field. As defined in RFC 2474, the first six
bits set the Differentiated Services Code Point (DSCP) value, and the last two bits are reserved. Network
devices use the DSCP value as a reference to determine the packet priority for transmission.
To set the DSCP value for DHCP packets:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A