Dell S4820T, Configuration Manual

Page: 344 / 1178

remove the statically configured IP route using the
no ip route
command, the management route
is reinstalled. Manually delete management routes added by the DHCP client.
• To reinstall management routes added by the DHCP client that is removed or replaced by the same
statically configured management routes, release the DHCP IP address and renew it on the
management interface.
• Management routes added by the DHCP client have higher precedence over the same statically
configured management route. Static routes are not removed from the running configuration if a
dynamically acquired management route added by the DHCP client overwrites a static management
route.
• Management routes added by the DHCP client are not added to the running configuration.
NOTE: Management routes added by the DHCP client include the specific routes to reach a DHCP
server in a different subnet and the management route.
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:
• unit number
• priority
• 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"
Configure Secure DHCP
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.
• Option 82
• DHCP Snooping
• Dynamic ARP Inspection
• Source Address Validation
Option 82
RFC 3046 (the relay agent information option, or Option 82) is used for class-based IP address
assignment.
The code for the relay agent information option is 82, and is comprised of two sub-options, circuit ID and
remote ID.
Circuit ID This is the interface on which the client-originated message is received.
344
Dynamic Host Configuration Protocol (DHCP)