Field Notice: FN - 64180 - Nexus 55xx, 56xx, and 600x Series Switch Platforms SNMPd process restart when process reaches Memory Threshold - Software Upgrade Recommended

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Publish Date	Comments
1.0	19-Aug-16	Initial Release
10.0	19-Oct-17	Migration to new field notice system

Products Affected

Affected OS Type	Affected Release	Affected Release Number	Comments
NON-IOS	7	7.1(0)N1(1a),7.1(0)N1(1b),7.1(1)N1(1),7.1(2)N1(1),7.1(3)N1(1),7.1(3)N1(2),7.2(0)N1(1),7.2(1)N1(1)

Defect Information

Defect ID	Headline
CSCuv32204	SNMPd Memory Leak in libport_mgr_common

Problem Description

The Cisco Nexus 55xx, 56xx, and 600x Series Switches that run certain NX-OS System Software versions can encounter a reset in the Simple Network Management Protocol daemon (SNMPd) process when the process reaches the memory threshold.

Background

The memory that is held by the SNMPd process under the libport_mgr_common module increases over time if the SNMP applications continuously send SNMPget requests on the entSensorThresholdSeverity [1.3.6.1.4.1.9.9.91.1.2.1.1.2] object. If the memory utilization of the libport_mgr_common module reaches 250 MB, the SNMPd process restarts.

You can enter this command in order to monitor the current memory utilization of the libport_mgr_common module:

esc-6004-A# show system internal snmp mem-stats detail | grep libport
 102 [r-xp]/isan/plugin/0/isan/lib/libport_m 509002 509003  253991998  253992437
esc-6004-A#

This issue is applicable to the Nexus switch platforms that are listed in the Products Affected section of this document that run these versions of the NX-OS System Software:

• 7.1(0)N1(1a)
• 7.1(1)N1(1b)
• 7.1(1)N1(1)
• 7.1(2)N1(1)
• 7.1(3)N1(1)
• 7.1(3)N1(2)
• 7.2(0)N1(1)
• 7.2(1)N1(1)

Note: The Cisco Nexus 55xx, 56xx, and 600x Series Switch platforms that run NX-OS System Software Versions 7.0(x) and earlier are not affected.

Problem Symptom

If the libport_mgr_common module memory utilization reaches 250 MB, the switch encounters a reset in the SNMPd process:

2016 Jun 10 02:20:16 N6001 %ETHPORT-5-SPEED: Interface Ethernet2/8,
 operational speed changed to 1 Gbps
2016 Jun 10 02:20:16 N6001 %ETHPORT-5-IF_DUPLEX: Interface Ethernet2/8,
 operational duplex mode changed to Full
2016 Jun 10 02:20:16 N6001 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet2/8,
 operational Receive Flow Control state changed to off
2016 Jun 10 02:20:16 N6001 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet2/8,
 operational Transmit Flow Control state changed to off
2016 Jun 10 02:20:16 N6001 %ETHPORT-5-IF_UP: Interface Ethernet2/8
 is up in mode trunk
2016 Jun 10 03:35:21 N6001 %SYSMGR-2-SERVICE_CRASHED: Service "snmpd" (PID 28063)
 hasn't caught signal 11 (core will be saved).
2016 Jun 10 11:41:28 N6001 %SYSMGR-2-SERVICE_CRASHED: Service "snmpd" (PID 12855)
 hasn't caught signal 11 (core will be saved).

Workaround/Solution

In order to resolve this issue, use SNMPwalk instead of SNMPget when you poll for the entSensorThresholdSeverity [1.3.6.1.4.1.9.9.91.1.2.1.1.2] object. Alternatively, you can upgrade the NX-OS System Software to one of these versions:

• 7.0(x) and earlier
• 7.1(4)N1(1) and later
• 7.3(0)N1(1) and later

How To Identify Affected Products

Use the following command to verify the Switch software level:

switch# show version | egrep system
#system: version 7.1(1)N1(1) [build 7.1(1)N1(1)]
switch#

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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