HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Comm - Page 41

dhcp relay server-group

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Parameters None Description Use dhcp relay server-detect to enable unauthorized DHCP server detection. Use undo dhcp relay server-detect to disable unauthorized DHCP server detection. By default, unauthorized DHCP server detection is disabled. With this function enabled, upon receiving a DHCP request, the DHCP relay agent will record from the request the IP addresses of all DHCP servers that ever offered IP addresses to the DHCP client and the receiving interface. Each server detected is recorded only once. The administrator can use this information from logs to check for unauthorized DHCP servers. After the information of recorded DHCP servers is cleared, the relay agent will re-record server information following this mechanism. Examples # Enable unauthorized DHCP server detection. system-view [Sysname] dhcp relay server-detect dhcp relay server-group Syntax dhcp relay server-group group-id ip ip-address View undo dhcp relay server-group group-id [ ip ip-address ] System view Default level 2: System level Parameters group-id: Specifies a DHCP server group by its number, in the range of 0 to 19. ip ip-address: Specifies a DHCP server IP address. Description Use dhcp relay server-group to specify a DHCP server for a DHCP server group. Use undo dhcp relay server-group to remove a DHCP server from a DHCP server group, if no ip ip-address is specified, all servers in the DHCP server group and the server group itself will be removed. By default, no DHCP server is specified for a DHCP server group. • The IP address of a DHCP server and the IP address of the DHCP relay agent's interface that connects the DHCP client cannot be in the same network segment. Otherwise, the client may fail to obtain an IP address. • If a server group has been correlated to multiple interfaces, you need to cancel these correlations before removing the server group. Related commands: display dhcp relay server-group. 34

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34
Parameters
None
Description
Use
dhcp relay server-detect
to enable unauthorized DHCP server detection.
Use
undo dhcp relay server-detect
to disable unauthorized DHCP server detection.
By default, unauthorized DHCP server detection is disabled.
With this function enabled, upon receiving a DHCP request, the DHCP relay agent will record from the
request the IP addresses of all DHCP servers that ever offered IP addresses to the DHCP client and the
receiving interface. Each server detected is recorded only once. The administrator can use this
information from logs to check for unauthorized DHCP servers.
After the information of recorded DHCP servers is cleared, the relay agent will re-record server
information following this mechanism.
Examples
# Enable unauthorized DHCP server detection.
<Sysname> system-view
[Sysname] dhcp relay server-detect
dhcp relay server-group
Syntax
dhcp relay server-group
group-id
ip
ip-address
undo dhcp relay server-group
group-id
[
ip
ip-address
]
View
System view
Default level
2: System level
Parameters
group-id
: Specifies a DHCP server group by its number, in the range of 0 to 19.
ip
ip-address
: Specifies a DHCP server IP address.
Description
Use
dhcp relay server-group
to specify a DHCP server for a DHCP server group.
Use
undo dhcp relay server-group
to remove a DHCP server from a DHCP server group, if no
ip
ip-address
is specified, all servers in the DHCP server group and the server group itself will be removed.
By default, no DHCP server is specified for a DHCP server group.
•
The IP address of a DHCP server and the IP address of the DHCP relay agent’s interface that
connects the DHCP client cannot be in the same network segment. Otherwise, the client may fail to
obtain an IP address.
•
If a server group has been correlated to multiple interfaces, you need to cancel these correlations
before removing the server group.
Related commands:
display dhcp relay server-group
.