Dell X1000 Networking X-Series Switches User Guide - Page 307

Overview, Global Settings

Page 307 highlights

FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\User Guide\Dell_Astute_Network_Admin_DHCP_Snooping&Relay.fm Overview NOTE: DHCP Relay is only operational in Layer 2+ mode. The device can act as a DHCP Relay agent that listens for DHCP messages, and relays them between DHCP servers and clients, which reside in different VLANs or IP subnets. This functionality is intended to be used when the client ingress VLAN is different than the VLAN on which DHCP servers are connected. The switch can relay DHCP messages received from its IPv4 interfaces to one or more configured DHCP servers. It uses the switch's IPv4 address of the interface where the message is received. The switch uses the address from the response to determine how to forward the response back to the DHCP client. DHCP Relay must be enabled globally and per VLAN. Limitations The following limitations exist for DHCP Relay: • It is not supported on IPv6. • It is not relayed to servers on the client's VLAN. • Packets that have option-82 information, added by other devices, are discarded. • It does not support Option 82 on non-VLAN interfaces. • It can be enabled only on a VLAN/Port/LAG that has an IP address defined on it. Global Settings To set the DHCP Relay global settings: 1 Click Network Administration > DHCP Snooping and Relay > DHCP Relay > Global Settings. The currently-define DHCP servers are displayed. 2 Click Edit, Settings Icon ( ). 3 Select whether Source IP Address is enabled or disabled. 4 Click OK. 5 To add a DHCP server, click Edit, Add. DELL CONFIDENTIAL - PRELIMINARY 8/9/16 - FOR PROOF ONLY Network Administration: DHCP Snooping and DHCP Relay 307

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Network Administration: DHCP Snooping and DHCP Relay
307
FILE LOCATION:
C:\Users\gina\Desktop\Checkout_new\Dell Astute\User
Guide\Dell_Astute_Network_Admin_DHCP_Snooping&Relay.fm
DELL CONFIDENTIAL – PRELIMINARY 8/9/16 - FOR PROOF ONLY
Overview
NOTE:
DHCP Relay is only operational in Layer 2+ mode.
The device can act as a DHCP Relay agent that listens for DHCP messages,
and relays them between DHCP servers and clients, which reside in different
VLANs or IP subnets.
This functionality is intended to be used when the client ingress VLAN is
different than the VLAN on which DHCP servers are connected.
The switch can relay DHCP messages received from its IPv4 interfaces to one
or more configured DHCP servers. It uses the switch’s IPv4 address of the
interface where the message is received. The switch uses the address from the
response to determine how to forward the response back to the DHCP client.
DHCP Relay must be enabled globally and per VLAN.
Limitations
The following limitations exist for DHCP Relay:
It is not supported on IPv6.
It is not relayed to servers on the client’s VLAN.
Packets that have option-82 information, added by other devices, are
discarded.
It does not support Option 82 on non-VLAN interfaces.
It can be enabled only on a VLAN/Port/LAG that has an IP address defined
on it.
Global Settings
To set the DHCP Relay global settings:
1
Click
Network Administration > DHCP Snooping and Relay > DHCP
Relay >
Global Settings
.
The currently-define DHCP servers are displayed.
2
Click
Edit,
Settings Icon
(
).
3
Select whether Source IP Address is enabled or disabled.
4
Click
OK
.
5
To add a DHCP server, click
Edit, Add
.