Configure Mismatch "Consumed" Power Inline Value with SNMPWalk and Switch CLI
Available Languages
Download Options
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Introduction
This document clarifies the confusion around polling of "pethMainPseConsumptionPower" OID to get the usage power on an interface of a Cisco Switch from Network Management System (NMS).
Problem
Simple Network Management Protocol (SNMP) Object Identifier (OID) - 1.3.6.1.2.1.105.1.3.1.1.4 (pethMainPseConsumptionPower), when polled to get "usage power" in Watts returns value that does not match with the Command Line Interpreter (CLI) generally used on the Cisco switch.
Example:
NMS> snmpwalk -c public -v2c 10.106.36.239 1.3.6.1.2.1.105.1.3.1.1.4
SNMPv2-SMI::mib-2.105.1.3.1.1.2.1 = Gauge32: 370
SNMPv2-SMI::mib-2.105.1.3.1.1.3.1 = INTEGER: 1
SNMPv2-SMI::mib-2.105.1.3.1.1.4.1 = Gauge32: 121
SNMPv2-SMI::mib-2.105.1.3.1.1.5.1 = INTEGER: 0
Switch# Show power inline
Available:370.0(w) Used:279.9(w) Remaining:90.1(w)
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Fa0/1 auto off 0.0 n/a n/a 15.4
Fa0/2 auto off 0.0 n/a n/a 15.4
Fa0/3 auto off 0.0 n/a n/a 15.4
Fa0/4 auto off 0.0 n/a n/a 15.4
Fa0/5 auto on 3.3 IP Phone 7821 1 15.4
Fa0/6 auto off 0.0 n/a n/a 15.4
Fa0/7 auto off 0.0 n/a n/a 15.4
Fa0/8 auto off 0.0 n/a n/a 15.4
Fa0/9 auto on 3.3 IP Phone 7821 1 15.4
Fa0/10 auto off 0.0 n/a n/a 15.4
Fa0/11 auto off 0.0 n/a n/a 15.4
Fa0/12 auto off 0.0 n/a n/a 15.4
Fa0/13 auto on 3.3 IP Phone 7821 1 15.4
Fa0/14 auto on 13.7 IP Phone DX650 4 15.4
Fa0/15 auto on 3.3 IP Phone 7821 1 15.4
The above behavior is seen on below hardware software versions:
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C2960+48PST-S 15.0(2)SE6 C2960-LANLITEK9-M
--
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 WS-C2960+24PC-S 15.0(2)SE6 C2960-LANLITEK9-M
--
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C2960S-48LPS-L 15.0(2)EX5 C2960S-UNIVERSALK9-M
2 52 WS-C2960S-48LPS-L 15.0(2)EX5 C2960S-UNIVERSALK9-M
Solution
"pethMainPseConsumptionPower" returns power consumed by Power over Ethernet (PoE) for an interface. For switches like 2960 which has power sensing and policing capability, this object identifier will give actual power consumed by PoE devices. We can see this using the CLI "show power inline police" which gives "actual power" consumed, along with the port individual consumption (under "Oper Power" and also "Totals" at the end).
NMS> snmpwalk -v 2c -c public 10.106.36.239 1.3.6.1.2.1.105.1.3.1.1
SNMPv2-SMI::mib-2.105.1.3.1.1.2.1 = Gauge32: 462
SNMPv2-SMI::mib-2.105.1.3.1.1.3.1 = INTEGER: 1
SNMPv2-SMI::mib-2.105.1.3.1.1.4.1 = Gauge32: 23
SNMPv2-SMI::mib-2.105.1.3.1.1.5.1 = INTEGER: 0
Switch#show power inline police
Available:462.0(w) Used:43.6(w) Remaining:418.4(w)
Interface Admin Oper Admin Oper Cutoff Oper
State State Police Police Power Power
--------- ------ ---------- ---------- ---------- ------ -----
Gi0/1 auto on none n/a n/a 5.7
Gi0/2 auto on none n/a n/a 3.9
Gi0/3 auto on none n/a n/a 5.2
Gi0/4 auto on none n/a n/a 8.7
Gi0/5 auto off none n/a n/a n/a
Gi0/6 auto off none n/a n/a n/a
Gi0/7 auto off none n/a n/a n/a
Gi0/8 auto off none n/a n/a n/a
Gi0/9 auto off none n/a n/a n/a
Gi0/10 auto off none n/a n/a n/a
Gi0/11 auto off none n/a n/a n/a
Gi0/12 auto off none n/a n/a n/a
Gi0/13 auto off none n/a n/a n/a
Gi0/14 auto off none n/a n/a n/a
Gi0/15 auto off none n/a n/a n/a
Gi0/16 auto off none n/a n/a n/a
Gi0/17 auto off none n/a n/a n/a
Gi0/18 auto off none n/a n/a n/a
Gi0/19 auto off none n/a n/a n/a
Interface Admin Oper Admin Oper Cutoff Oper
State State Police Police Power Power
--------- ------ ---------- ---------- ---------- ------ -----
Gi0/20 auto off none n/a n/a n/a
Gi0/21 auto off none n/a n/a n/a
Gi0/22 auto off none n/a n/a n/a
Gi0/23 auto off none n/a n/a n/a
Gi0/24 auto off none n/a n/a n/a
Gi0/25 auto off none n/a n/a n/a
Gi0/26 auto off none n/a n/a n/a
Gi0/27 auto off none n/a n/a n/a
Gi0/28 auto off none n/a n/a n/a
Gi0/29 auto off none n/a n/a n/a
Gi0/30 auto off none n/a n/a n/a
Gi0/31 auto off none n/a n/a n/a
Gi0/32 auto off none n/a n/a n/a
Gi0/33 auto off none n/a n/a n/a
Gi0/34 auto off none n/a n/a n/a
Gi0/35 auto off none n/a n/a n/a
Gi0/36 auto off none n/a n/a n/a
Gi0/37 auto off none n/a n/a n/a
Gi0/38 auto off none n/a n/a n/a
Gi0/39 auto off none n/a n/a n/a
Gi0/40 auto off none n/a n/a n/a
Gi0/41 auto off none n/a n/a n/a
Interface Admin Oper Admin Oper Cutoff Oper
State State Police Police Power Power
--------- ------ ---------- ---------- ---------- ------ -----
Gi0/42 auto off none n/a n/a n/a
Gi0/43 auto off none n/a n/a n/a
Gi0/44 auto off none n/a n/a n/a
Gi0/45 auto off none n/a n/a n/a
Gi0/46 auto off none n/a n/a n/a
Gi0/47 auto off none n/a n/a n/a
Gi0/48 auto off none n/a n/a n/a
--------- ------ ---------- ---------- ---------- ------ -----
Totals: 23.4
The USED power column represent the amount of PoE allocated to ports..
The AVAILABLE power column represents the total amount of PoE in the system.
The REMAINING power column means (Available - Used)
Hence the correct command to be used to compare the output of SNMPWALK of "pethMainPseConsumptionPower" is “show power inline police”.
Recommended Reading
Contributed by Cisco Engineers
- Akansha TrivediCisco TAC Engineer
FeedbackContact Cisco
- Open a Support Case
- (Requires a Cisco Service Contract)