Planet XGS3-24042 User Manual download pdf (Page 232)

100

101

29-69

host <address> [<mask> |

<prefix-length> ]

no host

Specify/delete

the IP address to be

assigned to the specified client when

binding address manually.

client-identifier <unique-identifier>

no client-identifier

Specify/delete the unique ID of the user

when binding address manually.

client-name <name>

no client-name

Configure/delete

a client name when

binding address manually.

3. Enable logging for address conflicts

Command

Explanation

Global Mode

ip dhcp conflict logging

no ip dhcp conflict logging

Enable/disable logging for DHCP address to

detect address conflicts.

Admin Mode

clear ip dhcp conflict <address | all >

Delete a single address conflict record or all

conflict records.

29.3 DHCP Relay Configuration

When the DHCP client and server are in different segments, DHCP relay is required to transfer DHCP packets.

Adding a DHCP relay makes it unnecessary to configure a DHCP server for each segment, one DHCP server

can provide the network configuration parameter for clients from multiple segments, which is not only

cost-effective but also management-effective.

DHCP ServerDHCP Cl i ent

DHCPDi s c over ( Br oadc as t )

DHCPOFFER(Uni cast)

DHCPREQUEST(Br oadcast )

DHCPACK( Uni cast )

DHCPDi s c over

DHCP Rel ay

DHCPOFFER

DHCPREQUEST

DHCPACK

Figure 29-2 DHCP relay

As shown in the above figure, the DHCP client and the DHCP server are in different networks, the DHCP

client performs the four DHCP steps as usual yet DHCP relay is added to the process.

1. The client broadcasts a DHCPDISCOVER packet, and DHCP relay inserts its own IP address to the

relay agent field in the DHCPDISCOVER packet on receiving the packet, and forwards the packet to

the specified DHCP server (for DHCP frame format, please refer to RFC2131).

2. On the receiving the DHCPDISCOVER packets forwarded by DHCP relay, the DHCP server sends

the DHCPOFFER packet via DHCP relay to the DHCP client.

3. DHCP client chooses a DHCP server and broadcasts a DHCPREQUEST packet, DHCP relay

forwards the packet to the DHCP server after processing.

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