My check_snmp command doesn´t work for switch monitoring

[Jessuzz94]

Who are you? a genius? it works!!, it shows me now

Uptime | SNMP OK - Timeticks: (1029845) 2:51:38.45
Port 1 Status | SNMP OK - up(1)

just one problem, the port 1 of my switch is off and it shows OK, it port is not in use, it should be CRITICAL dont you?

[jdalrymple]

I appreciate the compliment, thanks.

The switchport labeled port 1 on your Cisco box is probably not index 1. Note this output:

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[jdalrymple@localhost libexec]$ snmpwalk -v 1 -c public <cisco> IF-MIB::ifDescr
IF-MIB::ifDescr.1 = STRING: Vlan1
IF-MIB::ifDescr.200 = STRING: Vlan200
IF-MIB::ifDescr.301 = STRING: Vlan301
IF-MIB::ifDescr.5001 = STRING: Port-channel1
IF-MIB::ifDescr.5002 = STRING: Port-channel2
IF-MIB::ifDescr.5003 = STRING: Port-channel3
IF-MIB::ifDescr.5004 = STRING: Port-channel4
IF-MIB::ifDescr.10101 = STRING: GigabitEthernet0/1
IF-MIB::ifDescr.10102 = STRING: GigabitEthernet0/2
IF-MIB::ifDescr.10103 = STRING: GigabitEthernet0/3
IF-MIB::ifDescr.10104 = STRING: GigabitEthernet0/4
IF-MIB::ifDescr.10105 = STRING: GigabitEthernet0/5
IF-MIB::ifDescr.10106 = STRING: GigabitEthernet0/6
IF-MIB::ifDescr.10107 = STRING: GigabitEthernet0/7
IF-MIB::ifDescr.10108 = STRING: GigabitEthernet0/8
IF-MIB::ifDescr.10109 = STRING: GigabitEthernet0/9
IF-MIB::ifDescr.10110 = STRING: GigabitEthernet0/10
IF-MIB::ifDescr.10111 = STRING: GigabitEthernet0/11
IF-MIB::ifDescr.10112 = STRING: GigabitEthernet0/12
IF-MIB::ifDescr.10113 = STRING: GigabitEthernet0/13
IF-MIB::ifDescr.10114 = STRING: GigabitEthernet0/14
IF-MIB::ifDescr.10115 = STRING: GigabitEthernet0/15
IF-MIB::ifDescr.10116 = STRING: GigabitEthernet0/16
IF-MIB::ifDescr.10117 = STRING: GigabitEthernet0/17
IF-MIB::ifDescr.10118 = STRING: GigabitEthernet0/18
IF-MIB::ifDescr.10119 = STRING: GigabitEthernet0/19
IF-MIB::ifDescr.10120 = STRING: GigabitEthernet0/20
IF-MIB::ifDescr.10121 = STRING: GigabitEthernet0/21
IF-MIB::ifDescr.10122 = STRING: GigabitEthernet0/22
IF-MIB::ifDescr.10123 = STRING: GigabitEthernet0/23
IF-MIB::ifDescr.10124 = STRING: GigabitEthernet0/24
IF-MIB::ifDescr.10125 = STRING: GigabitEthernet0/25
IF-MIB::ifDescr.10126 = STRING: GigabitEthernet0/26
IF-MIB::ifDescr.10127 = STRING: GigabitEthernet0/27
IF-MIB::ifDescr.10128 = STRING: GigabitEthernet0/28
IF-MIB::ifDescr.10501 = STRING: Null0

[Jessuzz94]

So you mean the Port 1 is like the main port of the switch, like the native vlan, always present, something like that?

[jdalrymple]

Your service:

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define service{
use generic-service
host_name switchcisco
service_description Port 1 Status
check_command check_snmp!ifOperStatus.1
}

That gets you the status of the interface at SNMP OID index 1 (ifOperStatus.1)

If your switch was like mine, and you wanted the status of GigabitEthernet0/1 you would want the status of the interface at index 10101, so your service would read like this actually:

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define service{
use generic-service
host_name switchcisco
service_description Port 1 Status
check_command check_snmp!ifOperStatus.10101
}

You can run the same command I did against your switch to pair up indexes with interface names.

[Jessuzz94]

but for the interfaces fast ethernet is like ifOperStatus.1,2,3,4..... the number is corresponding to the number of the interface?, for example if i want to monitor the interface 23 of my switch, the service command is check_snmp!ifOperStatus.23?

[jdalrymple]

No, the SNMP index is somewhat arbitrary. If you make note of my output from above you can see the snmp offset for switchport (Interface) GigabitEthernet0/23 is 10123.

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[jdalrymple@localhost libexec]$ snmpwalk -v 1 -c public <cisco> IF-MIB::ifDescr
IF-MIB::ifDescr.1 = STRING: Vlan1

...

IF-MIB::ifDescr.10123 = STRING: GigabitEthernet0/23

So if I wanted to monitor that switchport in my environment it would be:

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check_command check_snmp!ifOperStatus.10123

[Jessuzz94]

The command snmp walk show me this

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xxxxx@ubuntu:~$ snmpwalk -v 1 -c public 192.168.1.20 IF-MIB::ifDescr
IF-MIB::ifDescr.1 = STRING: VLAN1
IF-MIB::ifDescr.2 = STRING: FastEthernet0/1
IF-MIB::ifDescr.3 = STRING: FastEthernet0/2
IF-MIB::ifDescr.4 = STRING: FastEthernet0/3
IF-MIB::ifDescr.5 = STRING: FastEthernet0/4
IF-MIB::ifDescr.6 = STRING: FastEthernet0/5
IF-MIB::ifDescr.7 = STRING: FastEthernet0/6
IF-MIB::ifDescr.8 = STRING: FastEthernet0/7
IF-MIB::ifDescr.9 = STRING: FastEthernet0/8
IF-MIB::ifDescr.10 = STRING: FastEthernet0/9
IF-MIB::ifDescr.11 = STRING: FastEthernet0/10
IF-MIB::ifDescr.12 = STRING: FastEthernet0/11
IF-MIB::ifDescr.13 = STRING: FastEthernet0/12
IF-MIB::ifDescr.14 = STRING: FastEthernet0/13
IF-MIB::ifDescr.15 = STRING: FastEthernet0/14
IF-MIB::ifDescr.16 = STRING: FastEthernet0/15
IF-MIB::ifDescr.17 = STRING: FastEthernet0/16
IF-MIB::ifDescr.18 = STRING: FastEthernet0/17
IF-MIB::ifDescr.19 = STRING: FastEthernet0/18
IF-MIB::ifDescr.20 = STRING: FastEthernet0/19
IF-MIB::ifDescr.21 = STRING: FastEthernet0/20
IF-MIB::ifDescr.22 = STRING: FastEthernet0/21
IF-MIB::ifDescr.23 = STRING: FastEthernet0/22
IF-MIB::ifDescr.24 = STRING: FastEthernet0/23
IF-MIB::ifDescr.25 = STRING: FastEthernet0/24
IF-MIB::ifDescr.26 = STRING: Null0
IF-MIB::ifDescr.27 = STRING: VLAN10

so, your command shows you list of interfaces in different numbers, thats are the mines, so is correct if i put just the number of the interfaces how describes up there?

[jdalrymple]

The command snmp walk show me this

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xxxxx@ubuntu:~$ snmpwalk -v 1 -c public 192.168.1.20 IF-MIB::ifDescr
IF-MIB::ifDescr.1 = STRING: VLAN1
IF-MIB::ifDescr.2 = STRING: FastEthernet0/1
IF-MIB::ifDescr.3 = STRING: FastEthernet0/2
IF-MIB::ifDescr.4 = STRING: FastEthernet0/3
IF-MIB::ifDescr.5 = STRING: FastEthernet0/4
IF-MIB::ifDescr.6 = STRING: FastEthernet0/5
IF-MIB::ifDescr.7 = STRING: FastEthernet0/6
IF-MIB::ifDescr.8 = STRING: FastEthernet0/7
IF-MIB::ifDescr.9 = STRING: FastEthernet0/8
IF-MIB::ifDescr.10 = STRING: FastEthernet0/9
IF-MIB::ifDescr.11 = STRING: FastEthernet0/10
IF-MIB::ifDescr.12 = STRING: FastEthernet0/11
IF-MIB::ifDescr.13 = STRING: FastEthernet0/12
IF-MIB::ifDescr.14 = STRING: FastEthernet0/13
IF-MIB::ifDescr.15 = STRING: FastEthernet0/14
IF-MIB::ifDescr.16 = STRING: FastEthernet0/15
IF-MIB::ifDescr.17 = STRING: FastEthernet0/16
IF-MIB::ifDescr.18 = STRING: FastEthernet0/17
IF-MIB::ifDescr.19 = STRING: FastEthernet0/18
IF-MIB::ifDescr.20 = STRING: FastEthernet0/19
IF-MIB::ifDescr.21 = STRING: FastEthernet0/20
IF-MIB::ifDescr.22 = STRING: FastEthernet0/21
IF-MIB::ifDescr.23 = STRING: FastEthernet0/22
IF-MIB::ifDescr.24 = STRING: FastEthernet0/23
IF-MIB::ifDescr.25 = STRING: FastEthernet0/24
IF-MIB::ifDescr.26 = STRING: Null0
IF-MIB::ifDescr.27 = STRING: VLAN10

so, your command shows you list of interfaces in different numbers, thats are the mines, so is correct if i put just the number of the interfaces how describes up there?

The index is the componenet after "ifDescr." and before " = STRING"...

IF-MIB::ifDescr.1 = STRING: VLAN1
IF-MIB::ifDescr.2 = STRING: FastEthernet0/1
IF-MIB::ifDescr.3 = STRING: FastEthernet0/2

If you want to monitor interface FastEthernet0/1:

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define service{
use generic-service
host_name switchcisco
service_description Port 1 Status
check_command check_snmp!ifOperStatus.2
}

[Jessuzz94]

Ooooh trueeeee, you right i didnt see it, ok im going to test it. thanks!!,

[ssax]

Great, let us know the results.