Q. Using the 'SNMP Traffic' probe, InterMapper does not see any interface information.

Running snmpwalk against it shows that interface data is present, just slightly different than I have seen.

For example, for a particular interface, in this case Ether1/2 the following data is presented:


IF-MIB::ifName.436211712 = STRING: Ethernet1/2
IF-MIB::ifType.436211712 = INTEGER: ethernetCsmacd(6)
IF-MIB::ifMtu.436211712 = INTEGER: 1500
IF-MIB::ifSpeed.436211712 = Gauge32: 4294967295
IF-MIB::ifInOctets.436211712 = Counter32: 2118158300
IF-MIB::ifInUcastPkts.436211712 = Counter32: 2578448498
IF-MIB::ifInNUcastPkts.436211712 = Counter32: 2132553
IF-MIB::ifOutOctets.436211712 = Counter32: 165806974
IF-MIB::ifOutUcastPkts.436211712 = Counter32: 75510023
IF-MIB::ifOutNUcastPkts.436211712 = Counter32: 6454548

A. The Nexus returns 64-bit interface data for virtual interfaces (eg, port channels), but not for the physical interfaces. 32-bit interface data is returned fine, but is not of much use for 10Gigabit line speeds.

Also, another issue is that the Nexus does not return SNMP interface data in real time. Rather when you query the switch you get returned data that is 15 to 20 seconds old.

Cisco says that that 64-bit counters for the physical interfaces are supported on the Nexus 5000s, as of NX-OS 4.1.3 N2.1.