Siemens S323, S223 Dhcp Relay Agent, Deleting Dhcp Lease Database, Dhcp Server Relay Agent Subnet

UMN:CLI	User Manual
	SURPASS hiD 6615 S223/S323 R1.5

8.8.3.3Deleting DHCP Lease Database

To delete a DHCP lease database, use the following command.

Command	Mode	Description
clear ip dhcp leasedb A.B.C.D/M		Deletes a DHCP lease database a specified subnet.
	Enable
clear ip dhcp leasedb pool		Deletes a DHCP lease database of a specified DHCP
POOL	Global	pool.
clear ip dhcp leasedb all		Deletes the entire DHCP lease database.

8.8.4DHCP Relay Agent

A DHCP relay agent is any host that forwards DHCP packets between clients and servers. The DHCP relay agents are used to forward DHCP requests and replies between clients and servers when they are not on the same physical subnet. The DHCP relay agent for- warding is distinct from the normal forwarding of an IP router, where IP datagrams are switched between networks somewhat transparently.

By contrast, DHCP relay agents receive DHCP messages and then generate a new DHCP message to send out on another interface. The DHCP relay agent sets the gate- way address and, if configured, adds the DHCP option 82 information in the packet and forwards it to the DHCP server. The reply from the server is forwarded back to the client after removing the DHCP option 82 information.

DHCP Server

Relay Agent 1

Relay Agent 2

Subnet 1	Subnet 2
*PC= DHCP Client

Fig. 8.32 Example of DHCP Relay Agent

To activate/deactivate the DHCP function in the system, use the following command.

Command	Mode	Description
service dhcp	Global	Activates the DHCP function in the system.
no service dhcp		Deactivates the DHCP function in the system.

250 A50010-Y3-C150-2-7619