That would require a telnet client enabled on my PC scrolling down, I can see as an example that the
polling method used for this device is SNMP and the polling interval is 120 seconds.
I can see as an example the interfaces and the state of those interfaces, we can see other information
about the device, including that it was rebooted.
Let's have a look at router 2, so here's router 2,
we can see information about the node once again that it's up,
we can see that it's being polled with SNMP,
we can see the interfaces once again, so let's have a look at serial 0/0 in this case, we can
see the utilization isn't very high on this interface because no traffic is being sent and we can see
that the interface is up.
So here's router 2
interface serial 0/0, that's the interface that we're looking at in NPM.
I'll shut this interface down.
Interface has gone down.
I'll click poll and now.
and as you can see, the interface has been shut down, that interface has gone down in Wireshark,
we can see that a message was sent from NPM to the router and the router then responded with information
about the OIDs on the device.
So let's do that again.
What I'll do is restart the capture.
We're going to search for SNMP and I'm going to specify an IP address
10.1.100.2 so we can see requests from the management station and then responses back from the
router.
What I'll do now is no shut the interface, so bring it up.
So I'm bringing up serial 0/0 back in the management interface.
I'll click poll now and notice there are no values for different OIDs
and now responses are coming back from the router, poll again interface is up,
So it was done previously.
So the NPM device is able to retrieve status information of network interfaces by using SNMP.
We can see, for instance, the speed of the interface utilization and other options on the interface
of the router or running within GNS3.