How to enable SNMP debug

Products

• XOS

Issue/Introduction

How to enable SNMP debug

SNMP timeouts occur and polls fail sometimes

Resolution

Below are the steps to enable/disable snmpd debug and collect data during a scheduled window: 

 

Enable snmpd debug, 

1. /etc/init.d/snmpd stop 

2. /usr/sbin/snmpd -LS 5 d -Lf /var/log/snmpd.log -p /var/run/snmpd.PID -a -d -V 

3. tail -f /var/log/snmpd.log ! Check if net-snmp initialized without any errors 
 

You should see some activity in the /var/log/snmpd.log when the SNMP polling occurs. 

 

4. Start tcpdump to .pcap file on CPM mgmt interface and sniff filtering only the polling device and/or SNMP traffic only (UDP/161)

5. Observe snmpd CPU utilization with top

6. Please upload the /var/log/snmpd.log from step2, pcap from step 4 and zipped /var/log/messages* to Bluecoat case to analyze the captured data from this session. 

 

To Disable snmpd debug when done 

1. /etc/init.d/snmpd stop 

2. service snmpd start 

3. ps aux |grep snmpd