TN-DHCP-MIB

All MIBs › TN-DHCP-MIB

Organization: Transition Networks, Inc.

Last Updated: 2012-10-08

Category: DHCP, Transition Networks Media Converters

Description: Manages Transition Networks DHCP client and relay agent configuration parameters.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

What Is TN-DHCP-MIB?

TN-DHCP-MIB is a Transition Networks private MIB for managing DHCP-related features on their managed Ethernet switches, with a particular focus on DHCP snooping for security and traffic control. It exposes configuration objects for enabling DHCP snooping globally and per-interface, along with statistics counters tracking DHCP message types such as discover and offer packets received and transmitted, and a mechanism to clear those statistics. This makes it useful for monitoring the software-level security posture and DHCP traffic health of a switch: rising discover/offer counts help confirm DHCP snooping is actively observing DHCP exchanges, and per-interface mode settings confirm which ports are trusted versus untrusted. It has no explicit dependency noted on other MIBs, though DHCP snooping features of this kind commonly complement standard interface and VLAN MIBs for full context. It is deployed on Transition Networks managed switches in networks where rogue DHCP server mitigation and DHCP traffic visibility are required, making TN-DHCP-MIB SNMP monitoring a standard part of DHCP-snooping security operations there.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-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

Transition Networks managed Ethernet switch

Monitoring Examples

An administrator can check tnDhcpSnoopingTable/tnDhcpSnoopingMode to confirm DHCP snooping is globally enabled, then inspect tnDhcpSnoopingIfTable/tnDhcpSnoopingIfMode to verify individual ports are configured as trusted or untrusted. Polling tnDhcpSnoopingStatisticsTable for tnDhcpSnoopingStatisticsRxDiscover and tnDhcpSnoopingStatisticsTxDiscover reveals DHCP discover traffic volume, and an unexpected spike could indicate a rogue DHCP client flood or a misbehaving device on an untrusted port.

What Can Be Monitored

DHCP snooping enable status (global/per-port)
trusted vs untrusted port mode
DHCP discover message count
DHCP offer message count
snooping statistics reset state

Imported Objects

From ENTITY-MIB

entPhysicalIndex

OBJECT-TYPE

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From SNMPv2-CONF

NOTIFICATION-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION
TimeStamp
TruthValue

From TRANSITION-SMI

tnProducts

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using tnDhcpSnoopingStatisticsRxDiscover OID:

Select a Transition Networks managed Ethernet switch (DHCP snooping enable/message-counter status) 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 tnDhcpSnoopingStatisticsRxDiscover 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 discover packets received on the port. 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 an INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if the count changes from its expected baseline, since that would indicate the underlying set of items changed unexpectedly. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
tnDhcpMIB	1.3.6.1.4.1.868.2.5.33			The mib module for DHCP settings.
tnDhcpMIBObjects	1.3.6.1.4.1.868.2.5.33.1
tnDhcpSnoopingMgmt	1.3.6.1.4.1.868.2.5.33.1.1
tnDhcpSnoopingTable	1.3.6.1.4.1.868.2.5.33.1.1.1		not-accessible	This table is for user to configure the global settings of DHCP Snooping.
tnDhcpSnoopingEntry	1.3.6.1.4.1.868.2.5.33.1.1.1.1		not-accessible	Each entry represents a global configuration of DHCP Snooping.
T/F tnDhcpSnoopingMode	1.3.6.1.4.1.868.2.5.33.1.1.1.1.1	TruthValue	read-write	Indicates the DHCP snooping mode operation. Possible modes are: True: Enable DHCP snooping mode operation. When DHCP snooping mode operation is enabled, the DHCP request messages will be forwarded to trusted ports and only allow reply packets from trusted ports. False: Disable DHCP snooping mode operation.
tnDhcpSnoopingIfTable	1.3.6.1.4.1.868.2.5.33.1.1.2		not-accessible	This table lets user to configure the DHCP Snooping for each port.
tnDhcpSnoopingIfEntry	1.3.6.1.4.1.868.2.5.33.1.1.2.1		not-accessible	Each entry represents a DHCP Snooping setting on a port.
INT tnDhcpSnoopingIfMode	1.3.6.1.4.1.868.2.5.33.1.1.2.1.1	INTEGER	read-write	Configure the DHCP Snooping port mode.
tnDhcpSnoopingStatisticsTable	1.3.6.1.4.1.868.2.5.33.1.1.3		not-accessible	This table provides statistics for DHCP Snooping on ports
tnDhcpSnoopingStatisticsEntry	1.3.6.1.4.1.868.2.5.33.1.1.3.1		not-accessible	Each entry represents a DHCP Snooping statistics on a port.
T/F tnDhcpSnoopingStatisticsClear	1.3.6.1.4.1.868.2.5.33.1.1.3.1.1	TruthValue	read-write	Clear the counters for the selected port.
INT tnDhcpSnoopingStatisticsRxDiscoverEx	1.3.6.1.4.1.868.2.5.33.1.1.3.1.2	INTEGER	read-only	The number of discover packets received on the port.
INT tnDhcpSnoopingStatisticsTxDiscover	1.3.6.1.4.1.868.2.5.33.1.1.3.1.3	INTEGER	read-only	The number of discover packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxOffer	1.3.6.1.4.1.868.2.5.33.1.1.3.1.4	INTEGER	read-only	The number of offer packets received on the port.
INT tnDhcpSnoopingStatisticsTxOffer	1.3.6.1.4.1.868.2.5.33.1.1.3.1.5	INTEGER	read-only	The number of offer packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxRequest	1.3.6.1.4.1.868.2.5.33.1.1.3.1.6	INTEGER	read-only	The number of request packets received on the port.
INT tnDhcpSnoopingStatisticsTxRequest	1.3.6.1.4.1.868.2.5.33.1.1.3.1.7	INTEGER	read-only	The number of request packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxDecline	1.3.6.1.4.1.868.2.5.33.1.1.3.1.8	INTEGER	read-only	The number of decline packets received on the port.
INT tnDhcpSnoopingStatisticsTxDecline	1.3.6.1.4.1.868.2.5.33.1.1.3.1.9	INTEGER	read-only	The number of decline packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxACK	1.3.6.1.4.1.868.2.5.33.1.1.3.1.10	INTEGER	read-only	The number of ACK packets received on the port.
INT tnDhcpSnoopingStatisticsTxACK	1.3.6.1.4.1.868.2.5.33.1.1.3.1.11	INTEGER	read-only	The number of ACK packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxNAK	1.3.6.1.4.1.868.2.5.33.1.1.3.1.12	INTEGER	read-only	The number of NAK packets received on the port.
INT tnDhcpSnoopingStatisticsTxNAK	1.3.6.1.4.1.868.2.5.33.1.1.3.1.13	INTEGER	read-only	The number of NAK packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxRelease	1.3.6.1.4.1.868.2.5.33.1.1.3.1.14	INTEGER	read-only	The number of release packets received.
INT tnDhcpSnoopingStatisticsTxRelease	1.3.6.1.4.1.868.2.5.33.1.1.3.1.15	INTEGER	read-only	The number of release packets transmitted.
INT tnDhcpSnoopingStatisticsRxInform	1.3.6.1.4.1.868.2.5.33.1.1.3.1.16	INTEGER	read-only	The number of inform packets received on the port.
INT tnDhcpSnoopingStatisticsTxInform	1.3.6.1.4.1.868.2.5.33.1.1.3.1.17	INTEGER	read-only	The number of inform packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxLeaseQuery	1.3.6.1.4.1.868.2.5.33.1.1.3.1.18	INTEGER	read-only	The number of lease query packets received on the port.
INT tnDhcpSnoopingStatisticsTxLeaseQuery	1.3.6.1.4.1.868.2.5.33.1.1.3.1.19	INTEGER	read-only	The number of lease query packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxLeaseUnassigned	1.3.6.1.4.1.868.2.5.33.1.1.3.1.20	INTEGER	read-only	The number of lease unassigned packets received on the port.
INT tnDhcpSnoopingStatisticsTxLeaseUnassigned	1.3.6.1.4.1.868.2.5.33.1.1.3.1.21	INTEGER	read-only	The number of lease unassigned packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxLeaseUnknown	1.3.6.1.4.1.868.2.5.33.1.1.3.1.22	INTEGER	read-only	The number of lease unknown packets received on the port.
INT tnDhcpSnoopingStatisticsTxLeaseUnknown	1.3.6.1.4.1.868.2.5.33.1.1.3.1.23	INTEGER	read-only	The number of lease unknown packets transmitted on the port.
INT tnDhcpSnoopingStatisticsRxLeaseActive	1.3.6.1.4.1.868.2.5.33.1.1.3.1.24	INTEGER	read-only	The number of lease active packets received on the port.
INT tnDhcpSnoopingStatisticsTxLeaseActive	1.3.6.1.4.1.868.2.5.33.1.1.3.1.25	INTEGER	read-only	The number of lease active packets transmitted on the port.
tnDhcpRelayMgmt	1.3.6.1.4.1.868.2.5.33.1.2
tnDhcpRelayTable	1.3.6.1.4.1.868.2.5.33.1.2.1		not-accessible	This table is for user to configure the DHCP Relay.
tnDhcpRelayEntry	1.3.6.1.4.1.868.2.5.33.1.2.1.1		not-accessible	Each entry represents a global configuration of DHCP Relay.
T/F tnDhcpRelayMode	1.3.6.1.4.1.868.2.5.33.1.2.1.1.1	TruthValue	read-write	Indicates the DHCP relay mode operation. Possible modes are: True: Enable DHCP relay mode operation. When DHCP relay mode operation is enabled, the agent forwards and transfers DHCP messages between the clients and the server when they are not in the same subnet domain. And the DHCP broadcast message won't be flooded for security considerations. False: Disable DHCP relay mode operation.
IPt tnDhcpRelayServerAddrType	1.3.6.1.4.1.868.2.5.33.1.2.1.1.2	InetAddressType	read-write	The type of the DHCP Relay server address.
IP tnDhcpRelayServerAddr	1.3.6.1.4.1.868.2.5.33.1.2.1.1.3	InetAddress	read-write	Indicates the DHCP relay server IP address. A DHCP relay agent is used to forward and to transfer DHCP messages between the clients and the server when they are not in the same subnet domain.
T/F tnDhcpRelayInfoMode	1.3.6.1.4.1.868.2.5.33.1.2.1.1.4	TruthValue	read-write	Indicates the DHCP relay information mode option operation. Possible modes are: True: Enable DHCP relay information mode operation. When DHCP relay information mode operation is enabled, the agent inserts specific information into a DHCP message when forwarding to DHCP server and removes it from a DHCP message when transferring to DHCP client. It only works when DHCP relay operation mode is enabled. False: Disable DHCP relay information mode operation.
INT tnDhcpRelayInfoPolicy	1.3.6.1.4.1.868.2.5.33.1.2.1.1.5	INTEGER	read-write	Indicates the DHCP relay information option policy. When DHCP relay information mode operation is enabled, if agent receives a DHCP message that already contains relay agent information, it will enforce the policy. The 'Replace' option is invalid when relay information mode is disabled. Possible policies are: replace, keep and drop.
tnDhcpRelayStatisticsTable	1.3.6.1.4.1.868.2.5.33.1.2.2		not-accessible	This table provides statistics for DHCP Relay.
tnDhcpRelayStatisticsEntry	1.3.6.1.4.1.868.2.5.33.1.2.2.1		not-accessible	Each entry represents a DHCP Relay statistics.
T/F tnDhcpRelayStatisticsClear	1.3.6.1.4.1.868.2.5.33.1.2.2.1.1	TruthValue	read-write	Clear the counters of the entry.
INT tnDhcpRelayStatisticsServerTransmitToServer	1.3.6.1.4.1.868.2.5.33.1.2.2.1.2	INTEGER	read-only	The number of packets that are relayed from client to server.
INT tnDhcpRelayStatisticsServerTransmitError	1.3.6.1.4.1.868.2.5.33.1.2.2.1.3	INTEGER	read-only	The number of packets that resulted in errors while being sent to clients.
INT tnDhcpRelayStatisticsServerReceiveFromServer	1.3.6.1.4.1.868.2.5.33.1.2.2.1.4	INTEGER	read-only	The number of packets received from server.
INT tnDhcpRelayStatisticsServerReceiveMissingAgentOption	1.3.6.1.4.1.868.2.5.33.1.2.2.1.5	INTEGER	read-only	The number of packets received without agent information options.
INT tnDhcpRelayStatisticsServerReceiveMissingCircuitID	1.3.6.1.4.1.868.2.5.33.1.2.2.1.6	INTEGER	read-only	The number of packets received with the Circuit ID option missing.
INT tnDhcpRelayStatisticsServerReceiveMissingRemoteID	1.3.6.1.4.1.868.2.5.33.1.2.2.1.7	INTEGER	read-only	The number of packets received with the Remote ID option missing.
INT tnDhcpRelayStatisticsServerReceiveBadCircuitID	1.3.6.1.4.1.868.2.5.33.1.2.2.1.8	INTEGER	read-only	The number of packets whose Circuit ID option did not match known circuit ID.
INT tnDhcpRelayStatisticsServerReceiveBadRemoteID	1.3.6.1.4.1.868.2.5.33.1.2.2.1.9	INTEGER	read-only	The number of packets whose Remote ID option did not match known Remote ID.
INT tnDhcpRelayStatisticsClientTransmitToClient	1.3.6.1.4.1.868.2.5.33.1.2.2.1.10	INTEGER	read-only	The number of relayed packets from server to client.
INT tnDhcpRelayStatisticsClientTransmitError	1.3.6.1.4.1.868.2.5.33.1.2.2.1.11	INTEGER	read-only	The number of packets that resulted in error while being sent to servers.
INT tnDhcpRelayStatisticsClientReceiveFromClient	1.3.6.1.4.1.868.2.5.33.1.2.2.1.12	INTEGER	read-only	The number of received packets from server.
INT tnDhcpRelayStatisticsClientReceiveAgentOption	1.3.6.1.4.1.868.2.5.33.1.2.2.1.13	INTEGER	read-only	The number of received packets with relay agent information option.
INT tnDhcpRelayStatisticsClientReplaceAgentOption	1.3.6.1.4.1.868.2.5.33.1.2.2.1.14	INTEGER	read-only	The number of packets which were replaced with relay agent information option.
INT tnDhcpRelayStatisticsClientKeepAgentOption	1.3.6.1.4.1.868.2.5.33.1.2.2.1.15	INTEGER	read-only	The number of packets whose relay agent information was retained.
INT tnDhcpRelayStatisticsClientDropAgentOption	1.3.6.1.4.1.868.2.5.33.1.2.2.1.16	INTEGER	read-only	The number of packets that were dropped which were received with relay agent information.
tnDhcpMIBNotifications	1.3.6.1.4.1.868.2.5.33.2

RFC description

Provides configuration and management of DHCP snooping settings on Transition Networks devices.

Start monitoring Transition Networks managed Ethernet switch (DHCP snooping enable/message-counter status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download TN-DHCP-MIB