CTRON-CDP-MIB

All MIBs › CTRON-CDP-MIB

Organization: Cabletron Systems, Inc.

Last Updated: 1999-08-28

Category: Vendor: Cabletron/Enterasys

Description: Manages Cabletron Discovery Protocol neighbor discovery, device topology, and CDP-equivalent device information.

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 CTRON-CDP-MIB?

CTRON-CDP-MIB is a Cabletron (Enterasys) MIB implementing a Cisco Discovery Protocol-like neighbor discovery mechanism, maintaining per-port information about directly connected neighboring devices to help management applications build a Layer 2 topology map. It exposes neighbor tables recording each discovered device's MAC address, IP address, connected port, device type, and chassis-level identifiers, plus timestamps for when neighbor entries changed or were deleted. It supports operational status monitoring by tracking topology-change events (neighbor added/removed) that can indicate cabling issues, device reboots, or unauthorized device attachment, and exposes the discovery process's own status/statistics. It is functionally analogous to the industry-standard LLDP-MIB and complements standard Layer 2 topology-mapping approaches. It is deployed on Cabletron/Enterasys switches in campus/enterprise networks for automated topology discovery and network mapping tools. Network engineers evaluating or troubleshooting this functionality can download the CTRON-CDP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CTRON-CDP-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

Cabletron/Enterasys switch

Monitoring Examples

An NMS would poll ctCDPNeighborTable (via ctCDPNeighborEntry rows) to enumerate neighbors seen on each local port, using ctCDPNeighborMAC, ctCDPNeighborIP, and ctCDPNeighborPort to build a topology map. Monitoring ctCDPNeighborLastChange and ctCDPNeighborLastDelete lets an administrator detect when a previously-seen neighbor disappears, indicating a failed link, unplugged cable, or a rogue device. ctCDPStatus and ctCDPStats provide the operational state and counters of the discovery process itself, useful for confirming the discovery feature is actively running.

What Can Be Monitored

neighbor device inventory (MAC/IP/port)
neighbor last-change/last-delete timestamps
chassis MAC/IP of neighbors
CDP discovery process status
discovery statistics

Imported Objects

From CTRON-MIB-NAMES

ctCDP

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From RMON2-MIB

TimeFilter

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
MacAddress
TEXTUAL-CONVENTION
TimeStamp

How to Use in IPNetwork Monitor

Example using ctCDPInPackets OID:

Select a Cabletron/Enterasys switch (neighbor discovery) 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 ctCDPInPackets into the Find box to locate it in the OID tree, then select it and click OK. It reports the count of CDP packets received by the device over all the ports. 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
ctCDPNeighbor	1.3.6.1.4.1.52.4.1.2.19.1
TIM ctCDPNeighborLastChange	1.3.6.1.4.1.52.4.1.2.19.1.1	TimeStamp	read-only	The value of sysUpTime at the time the cdpNeighborTable was subject to these events: row insertion, row deletion
TIM ctCDPNeighborLastDelete	1.3.6.1.4.1.52.4.1.2.19.1.2	TimeStamp	read-only	The value of sysUpTime the last time an entry in the ctCDPNeighborTable was deleted. This should be polled at an interval no greater than one second. When it changes, the whole table should be reread by management with a timeMark of 0 to rebuild connectivity map.
ctCDPNeighborTable	1.3.6.1.4.1.52.4.1.2.19.1.3		not-accessible	The CommonNeighborTable holds all known neighbors speaking cdp protocols.
ctCDPNeighborEntry	1.3.6.1.4.1.52.4.1.2.19.1.3.1		not-accessible	An entry containing objects pertaining to neighbor devices speaking CDP protocols.
TIM ctCDPNeighborTimeMark	1.3.6.1.4.1.52.4.1.2.19.1.3.1.1	TimeFilter	read-only	A TimeFilter for this entry as defined in RFC 2021.
MAC ctCDPNeighborMAC	1.3.6.1.4.1.52.4.1.2.19.1.3.1.2	MacAddress	read-only	The interface mac address of neighboring entity.
IP ctCDPNeighborIP	1.3.6.1.4.1.52.4.1.2.19.1.3.1.3	IpAddress	read-only	The IP address of SNMP agent on neighboring entity from which corresponding data for this port may be obtained. In the case of unnumbered IP Interfaces, this may not be the same as the port.
NUM ctCDPNeighborPort	1.3.6.1.4.1.52.4.1.2.19.1.3.1.4	InterfaceIndex	read-only	The ifIndex of the remote port. Note, there may not be an IP Interface associated with this port.
INT ctCDPNeighborType	1.3.6.1.4.1.52.4.1.2.19.1.3.1.5	INTEGER	read-only	The type of entity. This value is used to determine the general type of the object or service connected to a given port. In general, it is better to use system group sysServices to obtain an object's functionality.
MAC ctCDPNeighborChassisMAC	1.3.6.1.4.1.52.4.1.2.19.1.3.1.6	MacAddress	read-only	The MAC Address of the chassis in architectures where many manageable elements exist within a given chassis. If no containing chassis exists, exists, this value must be set to 000000:000000
IP ctCDPNeighborChassisIP	1.3.6.1.4.1.52.4.1.2.19.1.3.1.7	IpAddress	read-only	The IP address of the chassis itself. If no containing chassis exists, this value must be set to 0.0.0.0
STR ctCDPNeighborDescription	1.3.6.1.4.1.52.4.1.2.19.1.3.1.8	DisplayString	read-only	A textual description of the neighbor. It should contain operator diagnostic information similar to sysDescr: system type, firmware version...
STR ctCDPNeighborPortName	1.3.6.1.4.1.52.4.1.2.19.1.3.1.9	DisplayString	read-only	The value of object ifName of the neighbor's port.
CTC ctCDPNeighborCapability	1.3.6.1.4.1.52.4.1.2.19.1.3.1.10	CTCDPCapability	read-only	The current capabilities of the neighbor port.
ctCDPStatus	1.3.6.1.4.1.52.4.1.2.19.2
INT ctCDPGlobalStatus	1.3.6.1.4.1.52.4.1.2.19.2.1	INTEGER	read-write	The state of CDP for this entire managed entity. autoEnable(3) should the default mode for new implementations. In autoEnable mode, the device listens for CDP messages and upon receipt, begins sending CDP messages of the same version and type as received.
OCT ctCDPAuthenticationCode	1.3.6.1.4.1.52.4.1.2.19.2.2	OCTET STRING	read-write	The authentication code may be set to create individual CDP domains. CDP packets that arrive on a port must contain this string. This authentication code is global for the entire managed entity. The default for this string is 16 nulls.
ctCDPPortTable	1.3.6.1.4.1.52.4.1.2.19.2.3		not-accessible	This table shows enable/disable CDP status for each port.
ctCDPPortTableEntry	1.3.6.1.4.1.52.4.1.2.19.2.3.1		not-accessible	Each entry is indicative of a particuliar port in the system.
NUM ctCDPPort	1.3.6.1.4.1.52.4.1.2.19.2.3.1.1	InterfaceIndex	read-only	The ifIndex for a physical port. ifConnectorPresent is true(1) defines a physical port on which cdp pdus will be emitted.
INT ctCDPPortStatus	1.3.6.1.4.1.52.4.1.2.19.2.3.1.2	INTEGER	read-write	The current state administrative of cdp on a physical port. The ability to enable and disable the sending of CDP pdu's on a per port basis is controlled here.
INT ctCDPTransmitFrequency	1.3.6.1.4.1.52.4.1.2.19.2.4	INTEGER	read-write	The rate in seconds at which CDP pdu's are sent on all enabled ports.
INT ctCDPHoldTime	1.3.6.1.4.1.52.4.1.2.19.2.5	INTEGER	read-write	The maximum amount of time in seconds to wait before aging out an entry in the ctCDPNeighborTable. The agent may choose to change this value based on the hold time it receives from other devices so as to have a stable neighbor table which ages out entries in accordance with the transmit frequency.
OCT ctCDPVersion	1.3.6.1.4.1.52.4.1.2.19.2.6	OCTET STRING	read-only	The CDP version supported by this device as a bit string. For example, given support for two versions of cdp: 3 and 4 the bit representation in big endian form would be: 00001100.
ctronCdpMIB	1.3.6.1.4.1.52.4.1.2.19.3			This module defines a schema that maintains per port neighbor information for the express purpose of helping a managment application map Layaer 2 topology.
ctCDPConformance	1.3.6.1.4.1.52.4.1.2.19.3.11
ctCDPCompliances	1.3.6.1.4.1.52.4.1.2.19.3.11.1
ctCDPComplianceV10	1.3.6.1.4.1.52.4.1.2.19.3.11.1.1			The compliance statement for the ctronCdpMIB.
ctCDPGroups	1.3.6.1.4.1.52.4.1.2.19.3.11.2
ctCdpGroupV10	1.3.6.1.4.1.52.4.1.2.19.3.11.2.1			The set of managed objects that make up version 2 of the CTRON-CDP-MIB.
ctCDPStats	1.3.6.1.4.1.52.4.1.2.19.4
C32 ctCDPInPacketsEx	1.3.6.1.4.1.52.4.1.2.19.4.1	Counter32	read-only	Count of CDP packets received by the device over all the ports.
C32 ctCDPOutPackets	1.3.6.1.4.1.52.4.1.2.19.4.2	Counter32	read-only	Count of CDP packets successfully transmitted by the device over all the ports.
C32 ctCDPInvalidVersionPackets	1.3.6.1.4.1.52.4.1.2.19.4.3	Counter32	read-only	Count of CDP packets received with version not supported by the device.
C32 ctCDPParseErrorPackets	1.3.6.1.4.1.52.4.1.2.19.4.4	Counter32	read-only	Count of CDP packets received and could not be parsed successfully by the device.
C32 ctCDPTransmitErrors	1.3.6.1.4.1.52.4.1.2.19.4.5	Counter32	read-only	Count of errors occured by the device while trying to transmit CDP packets.
C32 ctCDPMemoryErrors	1.3.6.1.4.1.52.4.1.2.19.4.6	Counter32	read-only	Count of memory errors occured in the device while either trying to process the CDP packet or adding the neighbor entry or while trying to send a CDP packet.

RFC description

Cabletron Systems MIB for managing Cisco Discovery Protocol (CDP) or Cabletron Discovery Protocol information, enabling network device neighbor discovery and topology mapping.

Start monitoring Cabletron/Enterasys switch (neighbor discovery) 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 CTRON-CDP-MIB