DNOS-DHCPCLIENT-PRIVATE-MIB

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Organization: Dell, Inc.

Last Updated: 2011-01-26

Category: Protocol: DHCP, Vendor: Dell/DNOS

Description: Manages DHCP client configuration and lease status on management and routing interfaces of Dell DNOS devices.

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What Is DNOS-DHCPCLIENT-PRIVATE-MIB?

DNOS-DHCPCLIENT-PRIVATE-MIB is a Broadcom-authored private MIB for Dell DNOS switches that manages DHCP client behavior on the device's management and routing interfaces, including client enable/disable state and current lease information. It exposes configuration objects for enabling DHCP on an interface as well as status objects reflecting the obtained IP address, lease state, and renewal timing. From a monitoring perspective it lets administrators confirm that a switch's management interface has successfully obtained and renewed its DHCP lease, which is critical for maintaining reachability of the device for further SNMP or SSH management — a lapsed lease would explain a device going unreachable. It is a vendor-specific private MIB tied to the Broadcom-based DNOS agent, so it does not follow a standard IETF DHCP client MIB structure. It is typically deployed on Dell EMC DNOS switches where the management or routing interface is configured for DHCP-assigned addressing rather than static IP. Network engineers evaluating or troubleshooting this functionality can download the DNOS-DHCPCLIENT-PRIVATE-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DNOS-DHCPCLIENT-PRIVATE-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Dell EMC DNOS-based network switches

Monitoring Examples

An admin would check the DHCP client status/lease objects for the management interface to confirm the current lease is active and to see the time remaining before renewal is required. If the lease expiry approaches without a successful renewal event, the switch's management IP could change or drop, explaining a sudden loss of SNMP polling. Comparing the client-reported IP address against DNS/inventory records helps catch address drift after a DHCP server reassignment.

What Can Be Monitored

DHCP client enable state per interface
current leased IP address
lease renewal/expiry time
DHCP client operational status

Imported Objects

From DELL-REF-MIB

dnOS	OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From RFC1213-MIB

DisplayString

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks
Unsigned32

How to Use in IPNetwork Monitor

Example using agentdhcp4ClientRetryCount OID:

Select a Dell EMC network switch as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type agentdhcp4ClientRetryCount into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of times the DHCP Client sends a DHCP REQUEST message before the server responds . On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
fastPathDHCPClientPrivate	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100			The Broadcom Private MIB for DNOS DHCP Client
agentdhcp4ClientLeaseParameters	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1
agentdhcp4ClientLeaseParametersTable	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1		not-accessible	Displays DHCP Client Lease Information.
agentdhcp4ClientLeaseParametersEntry	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1		not-accessible	Information about a table entry.
NUM agentdhcp4ClientInterfaceIndex	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.1	InterfaceIndex	not-accessible	The Interface index on which the IP address was leased by the DHCP Server.
IP agentdhcp4ClientIpAddress	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.2	IpAddress	read-only	The IP Address leased by the DHCP Server .
IP agentdhcp4ClientSubnetMask	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.3	IpAddress	read-only	The Subnet mask of the IP Address leased by the DHCP Server .
IP agentdhcp4ClientDhcpServerAddress	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.4	IpAddress	read-only	The IP Address of the DHCP Server that leased the IP Address .
INT agentdhcp4ClientState	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.5	INTEGER	read-only	The State of the DHCP Client on this interface .
STR agentdhcp4ClientTransactionID	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.6	DisplayString	read-only	The transaction ID of the DHCP Client .
TIK agentdhcp4ClientLeaseTime	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.7	TimeTicks	read-only	The time remaining since the IP address is leased by the DHCP Server.It is displayed in days, hours, minutes and seconds.
TIK agentdhcp4ClientRenewTime	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.8	TimeTicks	read-only	The time remaining to send the next DHCP Renew Request by DHCP Client to renew the leased IP address. It is displayed in days, hours, minutes and seconds.
TIK agentdhcp4ClientRebindTime	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.9	TimeTicks	read-only	The time remaining to start the DHCP Rebind process. It is displayed in days, hours, minutes and seconds.
C32 agentdhcp4ClientRetryCountEx	1.3.6.1.4.1.674.10895.5000.2.6132.1.1.100.1.1.1.10	Counter32	read-only	The number of times the DHCP Client sends a DHCP REQUEST message before the server responds .

RFC description

Manages DHCP client lease information and configuration for Dell Networking OS devices.

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Download DNOS-DHCPCLIENT-PRIVATE-MIB