ZyXEL Communications IES-1248-51 Betriebsanweisung PDF herunterladen (Seite 220)

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Chapter 28 DHCP Relay

IES-1248-51V User’s Guide

220

The following table describes the labels in this screen.

Table 61 DHCP Relay

LABEL DESCRIPTION

VLAN ID Enter the ID of the VLAN served by the specified DHCP relay(s). Enter

0 to set up the default DHCP relay(s).

Enable DHCP

Relay:

Select this to have the IES-1248-51V relay DHCP requests in the

selected VLAN to a DHCP server and the server’s responses back to

the clients.

Enable Option82

Sub-option1

(Circuit ID)

Select this to have the IES-1248-51V add the originating port

numbers to DHCP requests in the selected VLAN regardless of

whether the DHCP relay is on or off. In the field next to the check box,

you can also specify up to 23 ASCII characters of additional

information for the IES-1248-51V to add to the DHCP requests that it

relays to a DHCP server. Examples of information you could add would

be the chassis number of the IES-1248-51V or the ISP’s name.

Enable Option82

Sub-option2

(Remote ID)

Enable DHCP relay info to have the IES-1248-51V add the sub-option

2 (Remote ID) to DHCP requests in the selected VLAN regardless of

whether the DHCP relay is on or off. In the field next to the check box,

you can also specify up to 23 ASCII characters of additional

information for the IES-1248-51V to add to the DHCP requests that it

relays to a DHCP server.

Primary Server IP Enter the IP address of one DHCP server to which the switch should

relay DHCP requests for the selected VLAN.

Secondary Server

Enter the IP address of a second DHCP server to which the switch

should relay DHCP requests for the selected VLAN. Enter 0.0.0.0 if

there is only one DHCP relay for the selected VLAN.

Relay Mode Specify how the IES-1248-51V relays DHCP requests for the selected

VLAN.

Auto - The IES-1248-51V routes DHCP requests to the active server

for the VLAN.

Both - The IES-1248-51V routes DHCP requests to the primary and

secondary server for the VLAN, regardless of which one is active.

Option Mode Specify the DHCP option 82 format, either private or TR-101 format.

See Section 28.2 on page 217 for more information.

Active Server This field has no effect if the Relay Mode is Both. If the Relay Mode

is Auto, select which DHCP server (the primary one or the secondary

one) to which the IES-1248-51V should relay DHCP requests for the

selected VLAN.

Apply Click Apply to save your changes to the IES-1248-51V’s volatile

memory. The IES-1248-51V loses these changes if it is turned off or

loses power, so use the Config Save link on the navigation panel to

save your changes to the non-volatile memory when you are done

configuring.

Cancel Click Cancel to begin configuring this screen afresh.

Server List This section lists the current DHCP relay settings for each VLAN. An

asterisk in parentheses (*) indicates which DHCP server is active for

each VLAN.

VID This field displays the ID of the VLAN served by the specified DHCP

relay(s).

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