Configure The System For User Port Stacking (Option 230); Configure Secure Dhcp - Dell Z9000 Configuration Manual

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If you enable DHCP snooping globally on a switch and you enable a DHCP client on an interface, the

trust port, source MAC address, and snooping table validations are not performed on the interface by

DHCP snooping for packets destined to the DHCP client daemon.

The following criteria determine packets destined for the DHCP client:

– DHCP is enabled on the interface.

– The user data protocol (UDP) destination port in the packet is 68.

– The chaddr (change address) in the DHCP header of the packet is the same as the interface's

MAC address.

An entry in the DHCP snooping table is not added for a DHCP client interface.

A switch can operate as a DHCP client and a DHCP server. DHCP client interfaces cannot acquire a

dynamic IP address from the DHCP server running on the switch. Acquire a dynamic IP address from

another DHCP server.

Virtual Router Redundancy Protocol (VRRP)

Do not enable the DHCP client on an interface and set the priority to 255 or assign the same DHCP

interface IP address to a VRRP virtual group. Doing so guarantees that this router becomes the VRRP

group owner.

To use the router as the VRRP owner, if you enable a DHCP client on an interface that is added to a VRRP

group, assign a priority less than 255 but higher than any other priority assigned in the group.

Configure the System for User Port Stacking (Option 230)

Set the stacking-option variable to provide stack-port detail on the DHCP server when you set the DHCP

offer. A stack can be formed when the units are connected.

Option 230 is the option for user port stacking. Use it to create up to eight stack groups. Define the

configuration parameters on the DHCP server for each chassis based on the chassis MAC address.

Configure the following parameters:

stack group ID

The received stacking configuration is always applied on the master stack unit.

option #230 "unit-number:3#priority:2#stack-group:14"

DHCP as defined by RFC 2131 provides no authentication or security mechanisms. Secure DHCP is a suite

of features that protects networks that use dynamic address allocation from spoofing and attacks.

DHCP Snooping

Dynamic ARP Inspection

Source Address Validation

Dynamic Host Configuration Protocol (DHCP)