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Drop in Vlan interface ..

Unanswered Question
Nov 20th, 2009
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I would be thankful if someone solve this issue.....

In Layer 3 switch ,Int Gi0/10 - which is connected to ISP . We have assigned the VLAN 10 to that physical interface (Gi0/10 - where the ISP connection terminate). We are able to see the drops in the Vlan (SVI) interface but not on the  physical interface . Meanwhile we are getting alert from our monitoring system saying that "Discard rate for port Vlan is 100%", threshold value for monitor is 1%"

We have not assigned any interface to this particular VLAN (10) . From the Vlan status we are able to see the 'drops' ,but not discards.Meantime, my monitoring system(Opmanager) says that 'Discard'

I hope ,Drop & Discard are different . If not kindly let me know the difference & and also the solution for this issue.

Waiting for your Valuable reply....

Output for the VLAN 10 interface

Vlan10 is up, line protocol is up
  Hardware is EtherSVI, address is 001d.xxxx.xxxx (bia 001d.xxxx.xxxx)
  Internet address is
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/124924/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 3000 bits/sec, 5 packets/sec
  5 minute output rate 1000 bits/sec, 1 packets/sec
     167153154 packets input, 15645624666 bytes, 0 no buffer
     Received 0 broadcasts (5330 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     12778422 packets output, 1246068945 bytes, 0 underruns
     0 output errors, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out

Thanks with Regards

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Giuseppe Larosa Fri, 11/20/2009 - 05:03
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Hello watersplitters,

you have at least one L2 port in Vlan10 that is your gi0/10.

I don't see any error in the sh int vlan10 that you have posted.

This makes me think of an issue, a misunderstanding in the network management software

provide more information, like switch platform and IOS image running on the box to get better help

Hope to help


watersplitters Sat, 11/21/2009 - 10:45
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Hi Giuslar ,

I hope this is the information ur looking for ..

Model : WS-C3560G
software version : 12.2<35>SE5

Network Monitoring Software = Opmanager

In our setup , we have many Layer3 switches; we never faced such drop in any of the vlan interfaces .Is it possible to find the rootcause for the drop in this particular vlan (10).

Hope for help...


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