Creating a dhcp server group, Creating a dhcp server group -19 – H3C Technologies H3C WX6000 Series Access Controllers User Manual

Page 214

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26-19

Item

Description

Dynamic
Bindings
Refresh

Track Timer
Interval

Enable or disable periodic refresh of dynamic client entries, and set the refresh interval.

Via the DHCP relay agent, a DHCP client sends a DHCP-RELEASE unicast message to the
DHCP server to relinquish its IP address. In this case the DHCP relay agent simply conveys
the message to the DHCP server, thus it does not remove the IP address from dynamic
client entries. To solve this problem, the periodic refresh of dynamic client entries feature is
introduced.

With this feature, the DHCP relay agent uses the IP address of a client and the MAC
address of the DHCP relay agent interface to periodically send a DHCP-REQUEST
message to the DHCP server.

If the server returns a DHCP-ACK message or does not return any message within a
specified interval, which means that the IP address is assignable now, the DHCP relay
agent will age out the client entry.

If the server returns a DHCP-NAK message, which means the IP address is still in use,
the relay agent will not age it out.

Note that if the Auto radio button is clicked on, the refresh interval is calculated by the relay
agent according to the number of client entries.

Return to

DHCP Relay Agent Configuration Task List

.

Creating a DHCP Server Group

Select Network > DHCP from the navigation tree to enter the default DHCP Relay page shown in

Figure 26-16

. In the Server Group field, click Add to enter the page shown in

Figure 26-17

.

Figure 26-17 Create a server group

Table 26-5

describes the DHCP server group configuration items.

Table 26-5 DHCP server group configuration items

Item

Description

Server Group ID

Type the ID of a DHCP server group.

You can create up to 20 DHCP server groups.

IP Address

Type the IP address of a server in the DHCP server group.

The server IP address cannot be on the same subnet as the IP address of the DHCP
relay agent; otherwise, the client cannot obtain an IP address.

Return to

DHCP Relay Agent Configuration Task List

.

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