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I have Cisco N9K-C9396PX L3 switch which has VLAN interface configured for my LAN gateway and i want to monitor how much traffic vlanXXX handling, I have configured SNMP monitoring to pull interface traffic but VLAN interface always empty and blank 

N9K# show interface vlan 200
Vlan200 is up, line protocol is up, autostate disabled
  Hardware is EtherSVI, address is  58f3.9ca9.d769
  Description: *** LAN ***  Internet Address is 10.20.30.1/24
  MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,
   reliability 255/255, txload 255/255, rxload 255/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  ARP type: ARPA
  Last clearing of "show interface" counters never
  L3 in Switched:
    ucast: 0 pkts, 0 bytes

I heard you can use counter command on interface but i found that command doesn't exist anymore on N9K

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  • 3
    One problem with your idea is that traffic only passes through the layer-3 interface as it is entering or leaving the VLAN. Traffic that is sourced and destined on the same VLAN does not pass through the layer-3 interface, only from the source layer-2 interface to the destination layer-2 interface. Remember that layer-2 switching is done in hardware, and unicast frames are sent directly from interface-to-interface by the MAC address table. Only unknown unicast, broadcast, and [possibly] multicast frames would hit other interfaces.
    – Ron Maupin ♦
    Commented Nov 13, 2019 at 14:41
  • 1
    Have you thought about Netflow? See "Configuring Bridged NetFlow on a VLAN: link
    – Pompi
    Commented Nov 13, 2019 at 19:01
  • show interface vlan 200 counters works with .9.3.1 on a n3k
    – Ricky
    Commented Nov 14, 2019 at 3:18
  • I ran that command but its has all counters are zero in output.
    – Satish
    Commented Nov 14, 2019 at 13:41

1 Answer 1

Reset to default
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Try this below:

sh vlan id #### counters

Vlan Id                             :2768
Unicast Octets In                  :408002485287319
Unicast Packets In                 :406829607885
Multicast Octets In                :0
Multicast Packets In               :0
Broadcast Octets In                :5561220609
Broadcast Packets In               :50359534
Unicast Octets Out                 :495135025172205
Unicast Packets Out                :444516557358
L3 Unicast Octets In                :0
L3 Unicast Packets In               :0
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