ProCurve 8200zl Uživatelská příručka stáhnout pdf (Strana 284)

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IP Routing Features

Configuring DHCP Relay

Broadcast Forwarding

The packets are forwarded using broadcast forwarding if the IP address of the

DHCP server is a subnet address or IP broadcast address (255.255.255.255).

The DHCP relay agent sets the DHCP server IP address to broadcast IP address

and will be forwarded to all VLANs with configured IP interfaces (except the

source VLAN).

Prerequisites for DHCP Relay Operation

For the DHCP Relay agent to work on the switch, you must complete the

following steps:

1. Enable DHCP Relay on the routing switch (the default setting).

2. Ensure that a DHCP server is servicing the routing switch.

3. Enable IP Routing on the routing switch.

4. Ensure that there is a route from the DHCP server to the routing switch

and back.

5. Add the IP address of the DHCP server to the list of VLANs connected to

the routing switch by configuring an IP helper address.

Enabling DHCP Relay

The DHCP Relay function is enabled by default on a ProCurve routing switch.

However, if DHCP has been disabled, you can re-enable it by entering the

following command at the global configuration level:

ProCurve(config)# dhcp-relay

To disable the DHCP Relay function, enter the no form of the command:

ProCurve(config)# no dhcp-relay

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