On 30.07.13 16:54, Bruno Galindro da Costa wrote:
Morten,
y.x.204.217 is an SNMP-enabled device, but I don't know if it has switchforwarding tables... It is a printer (Lexmark X464de). But this is a strange behaviour because there are other printers like that (with the same model) that are shown in netmap. I've already revised the snmp configuration and everything is good.
Today, that device was maped into netmap. I think some strange behaviourwas occured with that device which caused the error.
If this error occurs again, how can I debug it? Is there any snmp commandthat I can exec to see with tcpdump what is happening?
The fact that navtopology could not find "a reverse edge" from this printer is not an error. It is just debug information. Unless the printer supports LLDP/CDP you're not likely to ever find this information from the printer itself. A printer doesn't do ethernet switching, so there would normally not be any forwarding tables to be found.
NAV will normally trust a switch that says a printer is a neighbor on one of its ports, and insert that information into its topology.
If the printer was previously missing from your NAV topology and then suddenly appeared, I cannot say for sure why without getting a ton of debug information from you.
There's this howto, if you're interested: https://nav.uninett.no/doc/howto/debugging-topology.html