Monitoring a monitor session destination interface on Cisco 3750 stack

Help
1

I have an issue monitoring the traffic passing through an interface configured as a destination for a monitor session.

The interface ifOperationalStatus is reporrted as “down” by snmp:

IF-MIB::ifOperStatus.10702 = INTEGER: down(2)

That is “expected” from an IOS point of view:

#sh int te2/1/2
TenGigabitEthernet2/1/2 is up, line protocol is down (monitoring)

But the traffic is indeed flowing (and quite a lot):

IF-MIB::ifOutOctets.10702 = Counter32: 1907702521
after a few seconds:

IF-MIB::ifOutOctets.10702 = Counter32: 2363818853

same from the switch:

#sh int te2/1/2 counters

Port            InOctets    InUcastPkts    InMcastPkts    InBcastPkts
Te2/1/2                0              0              0              0

Port           OutOctets   OutUcastPkts   OutMcastPkts   OutBcastPkts
Te2/1/2   3763325516130003  4020352155274    43713906151   180755345065

wait some seconds:

#sh int te2/1/2 counters

Port            InOctets    InUcastPkts    InMcastPkts    InBcastPkts
Te2/1/2                0              0              0              0

Port           OutOctets   OutUcastPkts   OutMcastPkts   OutBcastPkts
Te2/1/2   3763328479611098  4020355036822    43713938868   180755373930

How cai I tell LibreNMS to ignore the fact that the interface is considered as “down” and monitor/graph it’s traffic?

2

Hi,

I dont think you can without changing the code.

Why do you want to graph a monitor interface?

3

Hi,

I use that interface to feed a security monitor appliance with the switch traffic, and being the appliance licensing tied to the traffic examined, I need to monitor the interface traffic.