AT-DHCP-MIB

All MIBs › AT-DHCP-MIB

Organization: Allied Telesis, Inc

Last Updated: 2009-04-01

Category: IP and Core Protocols, Vendor: Allied Telesis

Description: Manages DHCP server address pools, lease bindings, and statistics on Allied Telesis routers and layer-3 switches.

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What Is AT-DHCP-MIB?

AT-DHCP-MIB manages DHCP server address pools, lease bindings, and pool statistics on Allied Telesis routers and layer-3 switches acting as DHCP servers. It exposes configuration for address ranges and gateways, plus counters for pool exhaustion and exceeded-range events. Its monitoring value is centered on software service health: tracking how many clients have exceeded a range, how many addresses remain, and whether a pool has become exhausted, which reveals a DHCP service on the verge of failing to lease addresses to new clients. It is a self-contained Allied Telesis enterprise MIB, conceptually parallel to but not directly dependent on any formal IETF DHCP MIB. It is deployed on Allied Telesis routers/switches serving as the DHCP server for branch or campus LAN segments. Engineers can download the AT-DHCP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in AT-DHCP-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

Allied Telesis routers
Allied Telesis layer-3 switches

Monitoring Examples

The module defines dhcpRangeTable/dhcpRangeEntry with dhcpRangeBaseAddress, dhcpRangeNumberOfAddresses, and dhcpRangeGateway, alongside dhcpRangeExceededRange, dhcpRangeExceededClients, and dhcpRangeExceededRemaining. An administrator would poll dhcpRangeExceededClients and dhcpRangeExceededRemaining to detect an address pool approaching exhaustion before new clients start failing to obtain a lease, and watch dhcpTraps for exhaustion notifications tied to a specific dhcpRangeName.

What Can Be Monitored

DHCP address range configuration
pool exhaustion status
exceeded-range/client counts
remaining available addresses
gateway assignment per range

Imported Objects

From AT-SMI-MIB

DisplayStringUnsized
modules	OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DisplayString
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
dhcp	1.3.6.1.4.1.207.8.4.4.4.70			This MIB file contains definitions of managed objects for the DHCP module.
dhcpTraps	1.3.6.1.4.1.207.8.4.4.4.70.0
NTF dhcpRangeExhaustedTrap	1.3.6.1.4.1.207.8.4.4.4.70.0.1			This trap is generated when a DHCP client makes a request for an IP address and the request cannot be satisfied because all addresses in the range are already allocated to other devices.
NTF dhcpRangeExceededThresholdTrap	1.3.6.1.4.1.207.8.4.4.4.70.0.2			This trap is generated when a DHCP client makes a request for an IP address and a pre-defined usage threshold has been exceeded. The IP addresses will continue to be allocated until the range is exhausted.
NTF dhcpRangeExceededThresholdClearTrap	1.3.6.1.4.1.207.8.4.4.4.70.0.3			This trap is generated when the number of allocated clients in a designated range falls below a pre-defined usage threshold.
dhcpRangeTable	1.3.6.1.4.1.207.8.4.4.4.70.1		not-accessible	The table of DHCP ranges.
dhcpRangeEntry	1.3.6.1.4.1.207.8.4.4.4.70.1.1		not-accessible	A single entry of the DHCP range table. This contains information about a single DHCP range configured on this device.
INT dhcpRangeIndex	1.3.6.1.4.1.207.8.4.4.4.70.1.1.1	INTEGER	read-only	The index of this DHCP range. DHCP ranges are stored in a list which is ordered by range name. The index gives the place in the list. Note that if ranges are added or deleted, the index for a given range will change. Since this table is read-only, this will not have an undue effect, but if in future this table is made read-write, a mechanism will have to be created to lock the indices of the range table while SET operations are proceeding.
STR dhcpRangeName	1.3.6.1.4.1.207.8.4.4.4.70.1.1.2	DisplayStringUnsized	read-only	The name given to identify this DHCP range. This is the ultimate method for uniquely identifying this range. Names are compared without regard to case, for example >range1RANGE1<.
IP dhcpRangeBaseAddress	1.3.6.1.4.1.207.8.4.4.4.70.1.1.3	IpAddress	read-only	The base address of this range. This address defines the lower bound of the range of IP addresses which can be allocated to devices requesting an IP address via DHCP.
INT dhcpRangeNumberOfAddresses	1.3.6.1.4.1.207.8.4.4.4.70.1.1.4	INTEGER	read-only	The number of IP address in this range. This number defines the upper bound of the range of IP addresses which can be allocated to devices requesting an IP address via DHCP.
IP dhcpRangeGateway	1.3.6.1.4.1.207.8.4.4.4.70.1.1.5	IpAddress	read-only	The IP address of the BOOTP relay agent which will be relaying DHCP requests for this range. If this address is 0.0.0.0, then there will be no BOOTP relay agent and the range will be allocated to devices directly connected to this device.
dhcpTrapVariable	1.3.6.1.4.1.207.8.4.4.4.70.2
IP dhcpRangeExhaustedGateway	1.3.6.1.4.1.207.8.4.4.4.70.2.1	IpAddress	read-only	Whenever a DHCP client attempts to lease an IP address and the DHCP server cannot provide an address, this variable is set to the gateway address of the DHCP request. The gateway address is the IP address of the gateway acting as a BOOTP relay agent for the request. If there is no gateway, the address will be 0.0.0.0. If the gateway address is non-zero, the DHCP range from which the allocation should have been made will able to be identified by lookup in the DHCP range table.
IP dhcpRangeExhaustedInterface	1.3.6.1.4.1.207.8.4.4.4.70.2.2	IpAddress	read-only	Whenever a DHCP client attempts to lease an IP address and the DHCP server cannot provide an address, this variable is set to the IP address of the interface which received the DHCP request. If the gateway address associated with the failed DHCP request is 0.0.0.0, the interface address will be able to be used to lookup the range that was exhausted and from which the allocation should have been made.
STR dhcpRangeExceededRange	1.3.6.1.4.1.207.8.4.4.4.70.2.3	DisplayStringUnsized	read-only	Whenever a DHCP client attempts to lease an IP address and the DHCP server has exceeded a pre-defined threshold this variable is set to the name of the range which received the DHCP request.
INT dhcpRangeExceededClients	1.3.6.1.4.1.207.8.4.4.4.70.2.4	INTEGER	read-only	The number of IP addresses statically defined for a range upon creation. Based on the starting IP address for a range, this number determines the upper bound of IP addresses which can be allocated to devices requesting an IP address via DHCP.
INT dhcpRangeExceededRemaining	1.3.6.1.4.1.207.8.4.4.4.70.2.5	INTEGER	read-only	The number of IP addresses still available to be allocated in this range.
INT dhcpRangeExceededPercentage	1.3.6.1.4.1.207.8.4.4.4.70.2.6	INTEGER	read-only	The percentage of IP addresses in a range that are currently in use.
dhcpClientTable	1.3.6.1.4.1.207.8.4.4.4.70.3		not-accessible	The table of defined DHCP range client addresses.
dhcpClientEntry	1.3.6.1.4.1.207.8.4.4.4.70.3.1		not-accessible	A single entry of the DHCP range client table. This contains information about a single DHCP range client address.
IP dhcpClientIpAddress	1.3.6.1.4.1.207.8.4.4.4.70.3.1.1	IpAddress	read-only	An IP address from the range of available addresses.
OCT dhcpClientID	1.3.6.1.4.1.207.8.4.4.4.70.3.1.2	OCTET STRING	read-only	The hardware address of the client, if any, that has been assigned the IP address.
INT dhcpClientState	1.3.6.1.4.1.207.8.4.4.4.70.3.1.3	INTEGER	read-only	The state of the IP address; one of unused, inuse or reclaim.
INT dhcpClientType	1.3.6.1.4.1.207.8.4.4.4.70.3.1.4	INTEGER	read-only	The type of allocation mechanism applied to the IP address; one of static, auto or dyn.
OCT dhcpClientExpiry	1.3.6.1.4.1.207.8.4.4.4.70.3.1.5	OCTET STRING	read-only	The expiry date for dynamically allocated IP address.

RFC description

Monitors DHCP ranges and generates alerts when DHCP address pools are exhausted.

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Download AT-DHCP-MIB

What Is AT-DHCP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description