EPC SNMP

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General Information

  • SNMP can be used on the EPC
    • to retrieve status information and, if applicable, sensor data via UDP (port 161)
    • to switch the power ports.

For a complete list of SNMP queries and control actions available on your device, open the EPC Web Interface in your browser, go to the Configuration - SNMP menu, and click the Download SNMP MIB link.

The following applies to all devices in the Expert Power Control NET series:

  • Supported versions: SNMPv1 and SNMPv2c
  • Supported SNMP commands:
    • SNMPGET : Retrieve status and sensor information
    • SNMPGETNEXT : Retrieve next status information
    • SNMPSET : Request EPC state change

SNMP Communities

SNMP authenticates network requests using so-called communities. The SNMP request must include the public community for queries (read access) and the private community for status changes (write access). SNMP communities are, so to speak, read and write passwords. In SNMP versions v1 and v2c, the communities are transmitted unencrypted over the network and can therefore be easily intercepted within this collision domain using IP sniffers. We therefore strongly recommend using a DMZ or Access Control via IP ACL for access protection when using SNMP!

MIBs

The values that can be read or modified by the EPC—known as “managed objects”—are described in Management Information Bases (MIBs). Three different MIBs can be queried from the EPC:

  • system
  • interface
  • powerports

system and interface are standardized MIBs (MIB-II), while powerports is defined in a MIB (GUDEADS-EPC-MIB::gadsEPC) specifically designed for the EPC. These three substructures are organized into so-called OIDs (Object Identifiers). An OID represents the location of a value within the MIB structure. Each OID can alternatively be referred to by its symbolic name (subtree name).

The following example tables apply to the Expert Power Control NET 8x Rev. 2 and Expert Power Control NET 8x 8010

system

subtree name OID
system 1.3.6.1.2.1.1
sysDescr 1.3.6.1.2.1.1.1
sysObjectID 1.3.6.1.2.1.1.2
sysUpTime 1.3.6.1.2.1.1.3
sysContact 1.3.6.1.2.1.1.4
sysName 1.3.6.1.2.1.1.5
sysLocation 1.3.6.1.2.1.1.6
sysServices 1.3.6.1.2.1.1.7

interface

subtree name OID
ifIndex 1.3.6.1.2.1.2.2.1.1
ifDescr 1.3.6.1.2.1.2.2.1.2
ifType 1.3.6.1.2.1.2.2.1.3
ifMtu 1.3.6.1.2.1.2.2.1.4
ifSpeed 1.3.6.1.2.1.2.2.1.4
ifPhysAddress 1.3.6.1.2.1.2.2.1.6
ifAdminStatus 1.3.6.1.2.1.2.2.1.7
ifOperStatus 1.3.6.1.2.1.2.2.1.8
ifLastChange 1.3.6.1.2.1.2.2.1.9
ifInOctets 1.3.6.1.2.1.2.2.1.10
ifInUcastPkt 1.3.6.1.2.1.2.2.1.11
ifInNUcastPkts 1.3.6.1.2.1.2.2.1.12
ifInDiscards 1.3.6.1.2.1.2.2.1.13
ifInErrors 1.3.6.1.2.1.2.2.1.14
ifInUnknownProtos 1.3.6.1.2.1.2.2.1.15
ifOutOctets 1.3.6.1.2.1.2.2.1.16
ifOutUcastPkts 1.3.6.1.2.1.2.2.1.17
ifOutNUcastPkts 1.3.6.1.2.1.2.2.1.18
ifOutDiscards 1.3.6.1.2.1.2.2.1.19
ifOutErrors 1.3.6.1.2.1.2.2.1.20
ifOutQLen 1.3.6.1.2.1.2.2.1.21
ifSpecific 1.3.6.1.2.1.2.2.1.22


powerports

subtree name OID description r / w
GUDEADS-EPC-MIB 1.3.6.1.4.1.28507 Gude Analog- und Digitsysteme GmbH MIB (Private Enterprise) r
GUDEADS-EPC-MIB::gadsEPC8 1.3.6.1.4.1.28507.1 Expert Power Control MIB r
epc8powerports 1.3.6.1.4.1.28507.1.1.2 Expert Power Control's Powerports r
epc8portNumber 1.3.6.1.4.1.28507.1.1.2.1 total number of powerports r
epc8portTable 1.3.6.1.4.1.28507.1.1.2.2 Expert Power Control's Powerports SMI-Table r
epc8powerPortName 1.3.6.1.4.1.28507.1.1.2.2.1.2 A textual string containing name of a PowerPort. r
epc8powerPortState 1.3.6.1.4.1.28507.1.1.2.2.1.3 current state a PowerPort (0=off, 1=on) rw
epc8powerPortSwitchCount 1.3.6.1.4.1.28507.1.1.2.2.1.4 total number of switch actions ocurred on a powerPort. r

NET-SNMP

NET-SNMP provides a widely used collection of SNMP command-line tools (snmpget, snmpset, snmpwalk, etc.) NET-SNMP is available for Linux and Windows, among other platforms. After installing NET-SNMP, you should place the device-specific MIB for the EPC in NET-SNMP's share directory, for example at 

c:\usr\share\snmp\mibs

or 

/usr/share/snmp/mibs

This allows you to use the ‘subtree names’ instead of the OIDs later on:

  • subtree names
snmpwalk -v2c -mALL -c public 192.168.1.232 epc8powerports
  • OID
snmpwalk -v2c -mALL -c public 192.168.1.232 1.3.6.1.4.1.28507


EPC Settings

http://www.gudeads.com/wiki/images/epc_v2.2_config_snmp.jpg


Examples

walk system oids

snmpwalk -v2c -mALL -c public 192.168.1.232 system

SNMPv2-MIB::sysDescr.0 = STRING: ExpertPowerControl NET 8x
SNMPv2-MIB::sysObjectID.0 = OID: GUDEADS-EPC-MIB::gadsEPC
DISMAN-EXPRESSION-MIB::sysUpTimeInstance = Timeticks: (293200) 0:48:52.00
SNMPv2-MIB::sysContact.0 = STRING: http://www.gudeads.com/
SNMPv2-MIB::sysName.0 = STRING: ExpPowerControl
SNMPv2-MIB::sysLocation.0 = STRING: 
SNMPv2-MIB::sysServices.0 = INTEGER: 0

walk interface oids

snmpwalk -v2c -mALL -c public 192.168.1.232 interfaces

RFC1213-MIB::interfaces.0.0 = INTEGER: 1
RFC1213-MIB::ifIndex.1 = INTEGER: 1
RFC1213-MIB::ifDescr.1 = STRING: "eth_cf52235"
RFC1213-MIB::ifType.1 = INTEGER: ethernet-csmacd(6)
RFC1213-MIB::ifMtu.1 = INTEGER: 1500
RFC1213-MIB::ifSpeed.1 = Gauge32: 10000
RFC1213-MIB::ifPhysAddress.1 = Hex-STRING: 00 19 32 00 00 07 
RFC1213-MIB::ifAdminStatus.1 = INTEGER: up(1)
RFC1213-MIB::ifOperStatus.1 = INTEGER: up(1)
RFC1213-MIB::ifLastChange.1 = Wrong Type (should be Timeticks): INTEGER: 0
RFC1213-MIB::ifInOctets.1 = Counter32: 450378
RFC1213-MIB::ifInUcastPkts.1 = Counter32: 661
RFC1213-MIB::ifInNUcastPkts.1 = Counter32: 3254
RFC1213-MIB::ifInDiscards.1 = Counter32: 0
RFC1213-MIB::ifInErrors.1 = Counter32: 0
RFC1213-MIB::ifInUnknownProtos.1 = Counter32: 0
RFC1213-MIB::ifOutOctets.1 = Counter32: 255309
RFC1213-MIB::ifOutUcastPkts.1 = Counter32: 591
RFC1213-MIB::ifOutNUcastPkts.1 = Counter32: 6
RFC1213-MIB::ifOutDiscards.1 = Counter32: 0
RFC1213-MIB::ifOutErrors.1 = Counter32: 594
RFC1213-MIB::ifOutQLen.1 = Gauge32: 0
RFC1213-MIB::ifSpecific.1 = OID: SNMPv2-SMI::zeroDotZero.0

walk powerports

snmpwalk -v2c -mALL -c public 192.168.1.232 epc8powerports

GUDEADS-EPC-MIB::epc8portNumber = INTEGER: 8
GUDEADS-EPC-MIB::epc8powerPortName.1 = STRING: "SwitchPort 1"
GUDEADS-EPC-MIB::epc8powerPortName.2 = STRING: "SwitchPort 2"
GUDEADS-EPC-MIB::epc8powerPortName.3 = STRING: "SwitchPort 3"
GUDEADS-EPC-MIB::epc8powerPortName.4 = STRING: "SwitchPort 4"
GUDEADS-EPC-MIB::epc8powerPortName.5 = STRING: "SwitchPort 5"
GUDEADS-EPC-MIB::epc8powerPortName.6 = STRING: "SwitchPort 6"
GUDEADS-EPC-MIB::epc8powerPortName.7 = STRING: "SwitchPort 7"
GUDEADS-EPC-MIB::epc8powerPortName.8 = STRING: "SwitchPort 8"
GUDEADS-EPC-MIB::epc8powerPortState.1 = INTEGER: on(1)
GUDEADS-EPC-MIB::epc8powerPortState.2 = INTEGER: on(1)
GUDEADS-EPC-MIB::epc8powerPortState.3 = INTEGER: off(0)
GUDEADS-EPC-MIB::epc8powerPortState.4 = INTEGER: off(0)
GUDEADS-EPC-MIB::epc8powerPortState.5 = INTEGER: off(0)
GUDEADS-EPC-MIB::epc8powerPortState.6 = INTEGER: off(0)
GUDEADS-EPC-MIB::epc8powerPortState.7 = INTEGER: off(0)
GUDEADS-EPC-MIB::epc8powerPortState.8 = INTEGER: off(0)
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.1 = Counter32: 5
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.2 = Counter32: 1
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.3 = Counter32: 0
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.4 = Counter32: 0
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.5 = Counter32: 0
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.6 = Counter32: 0
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.7 = Counter32: 0
GUDEADS-EPC-MIB::epc8powerPortSwitchCount.8 = Counter32: 0


Checking the Powerport 1 status

snmpget -v2c -mALL -c private 192.168.1.232 epc8powerPortState.1

GUDEADS-EPC-MIB::epc8powerPortState.1 = INTEGER: on(1)


Turn on Powerport 1

snmpset -v2c -mALL -c private 192.168.1.232 epc8powerPortState.1  integer 1


downloads

All MIB tables can be downloaded directly from the device. Go to 

http://[enter the device's IP address]/config_snmp.html

and click the “Download SNMP MIB” link. The device-specific table will then be displayed.

Example MIBs:

Glossary

Abgerufen von „https://wiki.gude-systems.com/index.php?title=EPC_SNMP&oldid=1445“