Thursday, May 9, 2019

Over-utilizing a 10g link by almost a factor of 3x

I've run into a peculiar situation where we have a 10gig link on a fex N2K-C2348TQ-10GE that's homed on a nx-7710.
was looking into some highly utilized interfaces from our monitoring tools and i stumbled upon this. I'm in the process of gathering flow data as well, to get a traffic summary but has anyone ever seen anything remotely like this ?
** This is a simple access port, no Po/vpc config or anything crazy.

Ethernet106/1/23 is up

admin state is up, Dedicated Interface

Hardware: 100/1000/10000 Ethernet, address: --------------------

Description: <redacted>

MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec

reliability 255/255, txload 255/255, rxload 255/255

Encapsulation ARPA, medium is broadcast

Port mode is access

full-duplex, 10 Gb/s

Beacon is turned off

Auto-Negotiation is turned on

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

Auto-mdix is turned off

Switchport monitor is off

EtherType is 0x8100

Last link flapped 6d01h

Last clearing of "show interface" counters never

52 interface resets

Load-Interval #1: 30 seconds

30 seconds input rate 30027256248 bits/sec, 8777016 packets/sec

30 seconds output rate 27749913728 bits/sec, 9823523 packets/sec

input rate 30.03 Gbps, 8.78 Mpps; output rate 27.75 Gbps, 9.82 Mpps

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

300 seconds input rate 30034653080 bits/sec, 8778763 packets/sec

300 seconds output rate 27756727008 bits/sec, 9825391 packets/sec

input rate 30.03 Gbps, 8.78 Mpps; output rate 27.76 Gbps, 9.82 Mpps

RX

40527132025436559 unicast packets 12322847223540 multicast packets 5547494535

broadcast packets

40539459804483238 input packets 18170409363119202701 bytes

0 jumbo packets 0 storm suppression packets

0 runts 0 giants 0 CRC/FCS 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

40256512917375743 unicast packets 23028410478238 multicast packets 31395730214

94095 broadcast packets

43419103815088140 output packets 743404020901669 bytes

0 jumbo packets

0 output error 0 collision 0 deferred 0 late collision

0 lost carrier 0 no carrier 0 babble 0 output discard

0 Tx pause



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