Step 3: Display the Output for SNMP Trace Operations

Purpose

The SNMP log file shows more granular information about the packets sent and received through SNMP. In this step, the contents of the SNMP log file snmpd are displayed to verify that both the GetRequest and the GetResponse packets appear in the output.

Action

To display the output for trace operations, enter the following JUNOS command-line interface operational mode command:

user@host> show log snmpd 

Sample Output

user@R1> show log snmpd 

[...Output truncated...}

Jan 21 16:32:32 snmpd[28b6fdb3] >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Jan 21 16:32:32 snmpd[28b6fdb3] >>> Get-Request

Jan 21 16:32:32 snmpd[28b6fdb3] >>>  Source:      172.17.28.131

Jan 21 16:32:32 snmpd[28b6fdb3] >>>  Destination: 10.168.70.143

Jan 21 16:32:32 snmpd[28b6fdb3] >>>  Version: SNMPv1

Jan 21 16:32:32 snmpd[28b6fdb3] >>>  Request_id:  0x28b6fdb3

Jan 21 16:32:32 snmpd[28b6fdb3] >>>  Community:   public

Jan 21 16:32:32 snmpd[28b6fdb3] >>>  Error:     status=0 / vb_index=0

Jan 21 16:32:33 snmpd[28b6fdb3] >>>   OID  : sysDescr.0

Jan 21 16:32:33 snmpd[28b6fdb3] >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Jan 21 16:32:33 snmpd[28b6fdb3]  <<< Get-Response

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<  Source:      10.168.70.143

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<  Destination: 172.17.28.131

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<  Version: SNMPv1

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<  Request_id:  0x28b6fdb3

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<  Community:   public

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<  Error:     status=0 / vb_index=0

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<   OID  : sysDescr.0

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<   type : OctetString

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<   value: "m7i internet router, kernel 6.0R

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<          1.5"

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<   HEX  : 6d 37 69 20  69 6e 74 65

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<          72 6e 65 74  20 72 6f 75

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<          74 65 72 2c  20 6b 65 72

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<          6e 65 6c 20  36 2e 30 52

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<          31 2e 35

Jan 21 16:32:33 snmpd[28b6fdb3]  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

[...Output truncated...]

What It Means

The sample output shows the contents of the snmpd log file, with all of the packets sent and received through SNMP. The Get-Request packet is sent from a network management station and the Get-Response packet is sent from tp1. The value in the Get-response packet is the same as that returned to the network management station in Step 2, m7i internet router, kernel 6.0R1.5.