[c-nsp] drops on Vlan interface - sup720

[Jerome Fleury]

Hi,

I see drops on a vlan interface on my Sup720. The vlan interface is on a
2x1G etherchannel

However, the 2 gigabit interfaces of the etherchannel have no queue issue:

SW1.GRE#sh int gi1/23 | inc queue
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Output queue: 0/40 (size/max)
SW1.GRE#sh int gi1/24 | inc queue
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Output queue: 0/40 (size/max)

Doe someone have an idea where I should look at first ?
(details below)

Thanks


SW1.GRE#sh int po2
Port-channel2 is up, line protocol is up (connected)
  Hardware is EtherChannel, address is 0011.20e7.c98a (bia 0011.20e7.c98a)
  Description: F=B, E=BB1.GRE, P=ae0
  MTU 9216 bytes, BW 2000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 92/255, rxload 19/255
  Encapsulation ARPA, loopback not set
  Full-duplex, 1000Mb/s
  input flow-control is off, output flow-control is unsupported 
  Members in this channel: Gi1/23 Gi1/24 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 152135000 bits/sec, 87647 packets/sec
  5 minute output rate 725234000 bits/sec, 99372 packets/sec
     207947216600 packets input, 44631570217877 bytes, 0 no buffer
     Received 10315102 broadcasts (10310964 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     237075515646 packets output, 219837982247053 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

SW1.GRE#sh int vlan11
Vlan11 is up, line protocol is up 
  Hardware is EtherSVI, address is 0011.5d6a.dc00 (bia 0011.5d6a.dc00)
  Description: F=B, E=BB1.GRE, P=ae0.11
  Internet address is 212.129.1.54/30
  MTU 4470 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 176/255, rxload 37/255
  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 16:18:30
  Input queue: 1/75/1040/744 (size/max/drops/flushes); Total output drops: 0
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 145433000 bits/sec, 86066 packets/sec
  5 minute output rate 692230000 bits/sec, 95216 packets/sec
  L2 Switched: ucast: 1494256 pkt, 188596464 bytes - mcast: 113395 pkt,
33721309 bytes
  L3 in Switched: ucast: 2494075400 pkt, 528540693373 bytes - mcast: 0 pkt,
0 bytes mcast
  L3 out Switched: ucast: 2818177702 pkt, 2576657750171 bytes mcast:
20736382 pkt, 28242952284 bytes
     2498290535 packets input, 528949723390 bytes, 0 no buffer
     Received 118581 broadcasts (0 IP multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     2815916776 packets output, 2573848246783 bytes, 0 underruns
     0 output errors, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out