Re: Nexus 5k snmp IfInErrors/IfOutErrors

dong_madsn · ‎02-07-2014

I am trying to to graph the errors on Eth1/2 on my Nexus 5K. I do this via the following Oid: .1.3.6.1.2.1.2.2.1.14.IfIndex (for the nexus Eth1/2 int I am using 436211712 as Ifindex) for the input errors. This works brilliant on a router or a switch with the normal IOS. On my Nexus I get some strange results....

On my nexus I get "114" as a result for the input errors, which in it self is okay, the problem is that I cannot find this value looking at the interface.

N5K-1# sh int Eth1/2

Ethernet1/2 is up

Hardware: 1000/10000 Ethernet, address:

Description: [N5K-1]

MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec

reliability 255/255, txload 2/255, rxload 4/255

Encapsulation ARPA

Port mode is trunk

full-duplex, 10 Gb/s, media type is 10G

Beacon is turned off

Input flow-control is off, output flow-control is off

Rate mode is dedicated

Switchport monitor is off

EtherType is 0x8100

Last link flapped 50week(s) 2day(s)

Last clearing of "show interface" counters 01:44:18

30 seconds input rate 169236136 bits/sec, 48235 packets/sec

30 seconds output rate 110784488 bits/sec, 18387 packets/sec

Load-Interval #2: 5 minute (300 seconds)

input rate 186.29 Mbps, 52.00 Kpps; output rate 112.73 Mbps, 19.35 Kpps

RX

416641114 unicast packets 152559 multicast packets 48615 broadcast packets

416842288 input packets 221426676807 bytes

79910320 jumbo packets 0 storm suppression bytes

0 runts 0 giants 0 CRC 0 no buffer

0 input error 0 short frame 0 overrun 0 underrun 0 ignored

0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop

0 input with dribble 0 input discard

0 Rx pause

TX

160665228 unicast packets 304460 multicast packets 65177 broadcast packets

161034865 output packets 118557528934 bytes

48860086 jumbo packets

0 output errors 0 collision 0 deferred 0 late collision

0 lost carrier 0 no carrier 0 babble 0 output discard

0 Tx pause

0 interface resets

Using the following command sh int ethernet 1/2 counters errors snmp I get:

--------------------------------------------------------------------------------
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
--------------------------------------------------------------------------------
Eth1/2 0 0 0 0 0 0

--------------------------------------------------------------------------------
Port Single-Col Multi-Col Late-Col Exces-Col Carri-Sen Runts
--------------------------------------------------------------------------------
Eth1/2 0 0 0 0 0 0

--------------------------------------------------------------------------------
Port Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err
--------------------------------------------------------------------------------
Eth1/2 0 -- 0 0 0 0

So I thought I might use the wrong Ifindex, but this also seems to be allright

N5K-1# sh interface snmp-ifindex | inc 1/2

Eth1/2 436211712 (0x1a001000)

As far I can see in the documentation then all interfaces are persistent, so it is the right one.

Running show int counters detailed snmp | in "Input Errors:"

Input Errors:                                         2
Input Errors:                                       121
Input Errors:                                         5
Input Errors:                                         3
Input Errors:                                         3
Input Errors:                                         1
Input Errors:                                         1

So the 114 is not even an input error, is ther anyone who can tell me how to find the right Oid or help figuring out what it is that I am graphing?

dong_madsn · ‎02-10-2014

I did some further investigation. Doing an snmpwalk

snmpwalk -cpublic -v2c 10.3.95.5 1.3.6.1.2.1.2.2.1 | grep 436211712

iso.3.6.1.2.1.2.2.1.1.436211712 = INTEGER: 436211712

iso.3.6.1.2.1.2.2.1.2.436211712 = STRING: "Ethernet1/2"

iso.3.6.1.2.1.2.2.1.3.436211712 = INTEGER: 6

iso.3.6.1.2.1.2.2.1.4.436211712 = INTEGER: 1500

iso.3.6.1.2.1.2.2.1.5.436211712 = Gauge32: 4294967295

iso.3.6.1.2.1.2.2.1.6.436211712 = Hex-STRING: 54 7F EE 5B DC 69

iso.3.6.1.2.1.2.2.1.7.436211712 = INTEGER: 1

iso.3.6.1.2.1.2.2.1.8.436211712 = INTEGER: 1

iso.3.6.1.2.1.2.2.1.9.436211712 = Timeticks: (0) 0:00:00.00

iso.3.6.1.2.1.2.2.1.10.436211712 = Counter32: 4083166049

iso.3.6.1.2.1.2.2.1.11.436211712 = Counter32: 1269147921

iso.3.6.1.2.1.2.2.1.12.436211712 = Counter32: 522286869

iso.3.6.1.2.1.2.2.1.13.436211712 = Counter32: 0

iso.3.6.1.2.1.2.2.1.14.436211712 = Counter32: 114

iso.3.6.1.2.1.2.2.1.15.436211712 = Counter32: 0

iso.3.6.1.2.1.2.2.1.16.436211712 = Counter32: 1509434505

iso.3.6.1.2.1.2.2.1.17.436211712 = Counter32: 2608394584

iso.3.6.1.2.1.2.2.1.18.436211712 = Counter32: 761715136

iso.3.6.1.2.1.2.2.1.19.436211712 = Counter32: 0

iso.3.6.1.2.1.2.2.1.20.436211712 = Counter32: 3

iso.3.6.1.2.1.2.2.1.21.436211712 = Gauge32: 0

iso.3.6.1.2.1.2.2.1.22.436211712 = OID: ccitt.0

against that interface, alle the values seems to be correct, but i cannot correlate:

iso.3.6.1.2.1.2.2.1.10

iso.3.6.1.2.1.2.2.1.11

iso.3.6.1.2.1.2.2.1.12

iso.3.6.1.2.1.2.2.1.14

iso.3.6.1.2.1.2.2.1.16

iso.3.6.1.2.1.2.2.1.17

iso.3.6.1.2.1.2.2.1.18

iso.3.6.1.2.1.2.2.1.20

with any show commands. Even a clear counters interface ethernet 1/2 does not reset the error counters for (iso.3.6.1.2.1.2.2.1.14 and iso.3.6.1.2.1.2.2.1.20)

but they do reset the counter for sh int ethernet 1/2 counters errors snmp I tested that on another interface which had some errors shown.

Have I found a bug here or?

dong_madsn · ‎02-10-2014

Aha now I got it with respect to the erorror counters. I now read that SNMP counters cannot be cleared, so the errors might actually be true, the inteface just has been cleared and that is why I cannot refind the value!