ATDHCP-MIB

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Category: IP and Core Protocols, Vendor: Allied Telesis

Description: Manages DHCP server and relay configuration including address pool assignments and client lease tracking on Allied Telesis devices.

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What Is ATDHCP-MIB?

ATDHCP-MIB is an Allied Telesyn proprietary MIB (built on ATSWTCH2-MIB) reporting DHCP client-lease state on the switch's own management interface. Its objects cover the current DHCP client address (assigned by the server on DHCPOFFER once the client accepts the best offer via DHCPREQUEST/DHCPACK), subnet mask, current relay-agent address, next DHCP server address, lease timer, reacquisition timer, and expiration timer. As a status MIB it lets an administrator confirm the switch's own DHCP-obtained management address and remaining lease time on an Allied Telesyn switch. It is deployed on Allied Telesyn switching equipment. Engineers can download the ATDHCP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ATDHCP-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 Telesyn switching equipment

Monitoring Examples

An administrator checks atswitchDHCPExpirationTimer to confirm how much longer the switch's DHCP-leased management address remains valid on an Allied Telesyn switch.

What Can Be Monitored

DHCP client lease state on the switch's management interface

Imported Objects

From ATSWTCH2-MIB

alliedTelesyn	OBJECT-IDENTITY
atiProduct	OBJECT-IDENTITY
atswitchMib	OBJECT-IDENTITY
mibObject	OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC-1215

TRAP-TYPE

From RFC1155-SMI

Counter
IpAddress
TimeTicks
enterprises

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
atswitchDHCPGroup	1.3.6.1.4.1.207.8.10.11
atswitchDHCPSysGroup	1.3.6.1.4.1.207.8.10.11.1
IP atswitchDHCPCurrentDHCPClientAddress	1.3.6.1.4.1.207.8.10.11.1.1	IpAddress	read-only	Current IP address of the client. To start with,it might be null . This is filled by the server when sending a DHCPOFFER and the client uses the most comfortable offer from offers sent by different DHCP servers. A DHCPREQUEST packet is sent with the Client address agreed upon to the selected server ( Broadcast). Server Acks back this packet which is where Client/Server moves to the Bound state. Once reached into Bound state, the client address is made the official address on the client.
IP atswitchDHCPSubnetMask	1.3.6.1.4.1.207.8.10.11.1.2	IpAddress	read-only	When the client/server reaches the BOUND state, this is one of the parameters set by the server.
IP atswitchDHCPCurrentRelayAgentAddress	1.3.6.1.4.1.207.8.10.11.1.3	IpAddress	read-only	The IP address of the DHCP relay Agent on the same subnet. Normally there will be no DHCP server on each of the subnet and this Relay Agent will act in sending server accross the subnets. There might not be any relay agent. This depends on the network Toplogy like where is the DHCP server and DHCP client.
IP atswitchDHCPNextDHCPServerAddress	1.3.6.1.4.1.207.8.10.11.1.4	IpAddress	read-only	The IP address of the next DHCP server to be used during bootstrap. This address is sent by the DHCP server in the messages DHCPOFFER, DHCPACK,DHCPNACK.
atswitchDHCPTimerGroup	1.3.6.1.4.1.207.8.10.11.2
TIK atswitchDHCPLeaseTimer	1.3.6.1.4.1.207.8.10.11.2.1	TimeTicks	read-only	When the client/server reaches the BOUND state, this is one of the parameters set by the server. The lease time period in seconds for the DHCP client for using IP address on lease from the server. At the end of 50% of this timer a renewal request is sent by the client . This is the next Object atswitchDHCPRenewalTimer.
TIK atswitchDHCPReacquisitionTimer	1.3.6.1.4.1.207.8.10.11.2.2	TimeTicks	read-only	When the client/server reaches the BOUND state, this is one of the parameters set by the server. Mentioned in RFC2131 4.4.5 as T1, this renewal time period in secs for the DHCP client is for using IP address on lease from the server Once the Reacquisition Timer period in secs afetr the lease period is reached, the client sends a DHCPREQUEST to the DHCP server reque- -sting for renewal of the lease. Default would be 50% of the Lease timer which is represeneted by the above object. The client moves from BOUND to RENEW state once the DHCPREQUEST is sent after time T1 secs is passed from the start of to release time. T1 is always less than T2 ( see below for 'T2') which is lesss than the lease Timer period.
TIK atswitchDHCPExpirationTimer	1.3.6.1.4.1.207.8.10.11.2.3	TimeTicks	read-only	When the client/server reaches the BOUND state, this is one of the parameters set by the server. Mentioned in RFC2131 4.4.5 as T2,this Expiration time period in secs is the time period in secs during which DHCP has gone through the BOUND->RENEWAL state. After T1 secs and when the state machine reaches T2 secs, ( T1 < T2 < lease period), DHCP client sends another DHCPREQUEST to the server asking the server to renew the lease for the IP parameters. By default it would be 87.5% of the Lease timer .If there is DHCPACK then the DHCP client moves from REBIND to BOUND. Else it moves to INIT state where it starts all over again sending a request for DHCPDISCOVER.

RFC description

Allied Telesis vendor-private MIB for DHCP server management and configuration on AT networking devices.

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Download ATDHCP-MIB

What Is ATDHCP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description