HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Comm - Page 32

dhcp relay client-detect enable

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View undo dhcp relay check mac-address Interface view Default level 2: System level Parameters None Description Use dhcp relay check mac-address to enable MAC address check on the DHCP relay agent. Use undo dhcp relay check mac-address to disable MAC address check on the DHCP relay agent. By default, this function is disabled. With this function enabled, the DHCP relay agent compares the chaddr field of a received DHCP request with the source MAC address field of the frame. If they are the same, the DHCP relay agent decides this request as valid and forwards it to the DHCP server. If not, the DHCP request is discarded. DHCP relay agents change the source MAC addresses when forwarding DHCP packets. Therefore, you can enable MAC address check only on a DHCP relay agent directly connected to the DHCP clients. Otherwise, valid DHCP packets may be discarded and clients cannot obtain IP addresses. Examples # Enable MAC address check on the DHCP relay agent. system-view [Sysname] interface vlan-interface 1 [Sysname-Vlan-interface1] dhcp relay check mac-address dhcp relay client-detect enable Syntax dhcp relay client-detect enable View undo dhcp relay client-detect enable Interface view Default level 2: System level Parameters None Description Use dhcp relay client-detect enable to enable offline detection on the DHCP relay agent. Use undo dhcp relay client-detect enable to disable offline detection on the DHCP relay agent. By default, this function is disabled. 25

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25
undo dhcp relay check mac-address
View
Interface view
Default level
2: System level
Parameters
None
Description
Use
dhcp relay check mac-address
to enable MAC address check on the DHCP relay agent.
Use
undo dhcp relay check mac-address
to disable MAC address check on the DHCP relay agent.
By default, this function is disabled.
With this function enabled, the DHCP relay agent compares the chaddr field of a received DHCP request
with the source MAC address field of the frame. If they are the same, the DHCP relay agent decides this
request as valid and forwards it to the DHCP server. If not, the DHCP request is discarded.
DHCP relay agents change the source MAC addresses when forwarding DHCP packets. Therefore, you
can enable MAC address check only on a DHCP relay agent directly connected to the DHCP clients.
Otherwise, valid DHCP packets may be discarded and clients cannot obtain IP addresses.
Examples
# Enable MAC address check on the DHCP relay agent.
<Sysname> system-view
[Sysname] interface vlan-interface 1
[Sysname-Vlan-interface1] dhcp relay check mac-address
dhcp relay client-detect enable
Syntax
dhcp relay client-detect enable
undo dhcp relay client-detect enable
View
Interface view
Default level
2: System level
Parameters
None
Description
Use
dhcp relay client-detect enable
to enable offline detection on the DHCP relay agent.
Use
undo dhcp relay client-detect enable
to disable offline detection on the DHCP relay agent.
By default, this function is disabled.