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List:       net-snmp-coders
Subject:    IF-MIB::ifOperStatus wtih ifup/ifdown commands
From:       Josef Ridky <jridky () redhat ! com>
Date:       2017-05-25 13:12:47
Message-ID: 87738501.15716165.1495717967019.JavaMail.zimbra () redhat ! com
[Download RAW message or body]

Hi,

I would like to ask you for your opinion/hint about this report:

------- BEGIN -------
Description of problem:
SNMP IF-MIB::ifOperStatus doesn't report correct status of NIC if it is brought down with ifdown command

Steps to Reproduce:
1. Install net-snmp
2. Bring down network interface using ifdown
3. Execute $snmpwalk -v 2c  -c public localhost interface

Actual results:
net-snmp reports incorrect ifOperStatus

Expected results:
net-snmp should reports correct ifOperStatus

Additional info:

[root@dhcp5-123 ~]# ifdown eth0
Device 'eth0' successfully disconnected.

[root@dhcp5-123 ~]# snmpwalk -v2c -c public localhost .1.3.6.1.2.1.2.2.1.2
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: ens3
IF-MIB::ifDescr.3 = STRING: virbr0
IF-MIB::ifDescr.4 = STRING: virbr0-nic
IF-MIB::ifDescr.5 = STRING: eth0

[root@dhcp5-123 ~]# snmpwalk -v2c -c public localhost .1.3.6.1.2.1.2.2.1.8
IF-MIB::ifOperStatus.1 = INTEGER: up(1)
IF-MIB::ifOperStatus.2 = INTEGER: up(1)
IF-MIB::ifOperStatus.3 = INTEGER: down(2)
IF-MIB::ifOperStatus.4 = INTEGER: down(2)
IF-MIB::ifOperStatus.5 = INTEGER: up(1)

------- End -------

I have found, that in case, the LAN cable is physically unplugged, than ifOperStatus is correct.
However, when are used ifup/ifdown commands, than ifOperStatus is wrong.

Do you have any workaround or hint how can be this issue solved?

Regards

Josef Ridky
Associate Software Engineer
Core Services Team
Red Hat Czech, s.r.o.


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