show interface vlan (vlan id) doesnt show in/out traffic rate

[saeedkhalid]

I have configured a vlan interface on a 3750 switch. there is aprox 4Mb active traffic flowing through the interface, but when I do a "show interface vlan (vlanid)" the output show zero bits in and zero bits out. Its a typical L3 config with one IP on the vllan interface acting as the gateway for the VLAN devices.

Is this a normal behaviur ? and if so is there any way to get the traffic in/out stats. The end PC/devices are connected to this switch via an L2 TRUNK and I dont have access to the L2 switch on which the actual devices connect. so cant get the real time stats of those interfaces.

[Reza Sharifi]

No, that is not normal.  Under the vlan interface, you should input and output packets increasing.  If you have 4Mb active connection, you should also be able to see input rate increasing. In below example I am pinging the SVI interface of a switch from a directly connected PC with packet size of 1400 bytes and on the switch the input rate is increased to as high as 14000 bits/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 13000 bits/sec, 6 packets/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 12000 bits/sec, 5 packets/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 12000 bits/sec, 5 packets/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 12000 bits/sec, 5 packets/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 12000 bits/sec, 5 packets/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 12000 bits/sec, 5 packets/sec

Switch#sh int vlan 1 | inc 5 minute input rate

  5 minute input rate 12000 bits/sec, 5 packets/sec

Switch#

HTH

[InayathUlla Sharieff]

Hi ,

Check if there is traffic flowing through this vlan.

second there use to be a command: "counters" which we used to configure:

eg:

interface Vlan501

ip address xxx.xxx.xxx.xxx 255.255.255.xxx

ip broadcast-address xxx.xxx.xxx.xxx

no ip proxy-arp

counter  <<<<<  check if you can configure this cmd on your box.

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/54sg/command/reference/ch2a_ins.html#wp1036313

HTH

Regards

Inayath