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interface up but last input never

alioune-ndiaye
Level 1
Level 1

Hello everybody,

I have a issue regarding my Cisco Catalyst Blade Switch 3020 for HP, it is connected to C6500 via uplink port.

the interface is up up but any traffic in it.

I use version: 12.2.46 (cbs30x0-ipbasek9-mz.122-46.SE.bin).

Here is the  output:

GigabitEthernet0/17 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is ec30.911b.b291 (bia ec30.911b.b291)

  Description: swi 1

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 22000 bits/sec, 38 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts (0 multicasts)

     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

     48379 packets output, 3487508 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

show interfaces status does not have any err disble:

"

Gi0/17    swi 1              connected    trunk      a-full a-1000 1000BaseSX SFP"

Any help would be appreciated.

Regards

Alioune

4 Replies 4

davy.timmermans
Level 4
Level 4

For some reason no input traffic has been seen as I check the other counters

GigabitEthernet0/17 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is ec30.911b.b291 (bia ec30.911b.b291)

  Description: swi 1

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 22000 bits/sec, 38 packets/sec

    0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts (0 multicasts)

     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

    48379 packets output, 3487508 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

If STP is properly configured you would see BPDU packets packets in both directions

What is the output of show spanning-tree interface0/17? and the same at the other side of the link (HP?)

If it's in forwarding state, you can initiate a ping, but you've to be sure this link is in forwarding state

Leo Laohoo
Hall of Fame
Hall of Fame

Hi Alioune,

The last time I saw an interface "behave" this way it was connected to a redundant port of a server running on NIC Teaming. 

Thank you guys!

Davy:

The interface G0/17 is fwding:

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi0/17           Desg FWD 4         128.17   P2p

For the C6500:

Spanning tree is fwding as well:

Gi8/2               Desg FWD 20000     128.898  P2p

Leolaohoo:
I have 2 C3020 switch connected  via fiber uplinks port to one C6500( respectively G0/1 for SW1 and G0/1 foe SW2)
Regards
Alioune

Thank you !

Davy:

The interface G0/17 is fwding:

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi0/17           Desg FWD 4         128.17   P2p

Regards

Alioune