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Drop in Vlan interface ..

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


Scenario:
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 10.10.10.6/25
  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

Giuseppe

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
SW Image : C3560-IPSERVICES-M
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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