LINE-PROTOCOL FLAPPING

[David Martinez Garcia]

Hi all.

I 've four switches with LINE-PROTOCOL FLAPPIG.

For example, you can see the following example:

************************************************************************************************

SW3_XXXXXXX#SH INT F0/15

FastEthernet0/15 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is 04c5.a458.128f (bia 04c5.a458.128f)

  Description: USUARIOS

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

  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 2d01h

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

  Queueing strategy: fifo

  Output queue: 0/0 (size/max)

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

  5 minute output rate 15000 bits/sec, 25 packets/sec

     776885 packets input, 72843812 bytes, 0 no buffer

     Received 18197 broadcasts (438 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 438 multicast, 0 pause input

     0 input packets with dribble condition detected

     2781433 packets output, 284980941 bytes, 0 underruns

     0 output errors, 0 collisions, 0 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

091938: Jan 12 08:17:01.584 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

091939: Jan 12 08:23:33.365 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to down

091940: Jan 12 08:23:35.379 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

091941: Jan 12 08:23:49.572 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to down

091942: Jan 12 08:23:51.585 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

092029: Jan 12 10:33:11.433 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to down

092030: Jan 12 10:33:12.440 GMT: %LINK-3-UPDOWN: Interface FastEthernet0/15, changed state to down

092031: Jan 12 10:33:30.207 GMT: %LINK-3-UPDOWN: Interface FastEthernet0/15, changed state to up

092032: Jan 12 10:33:31.214 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

092033: Jan 12 10:33:43.495 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to down

092034: Jan 12 10:33:45.516 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

092035: Jan 12 10:35:19.343 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to down

092036: Jan 12 10:35:21.356 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

092037: Jan 12 10:35:35.365 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to down

092038: Jan 12 10:35:37.378 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/15, changed state to up

*************************************************

As you can see, there are a lot of LINE-PROTOCOL flapping with no error nor colision on the interface.

Any idea??

Thank you!!

[Peter Paluch]

Hi David,

Can you please post the output of the following commands?

show run int fa0/15

show int fa0/15 counters

show int fa0/15 counters errors

show int fa0/15 counters protocol status

show int fa0/15 stats

show int fa0/15 status

Also, what is connected to that interface - is it some end device or another switch?

Best regards,

Peter

[David Martinez Garcia]

Hi Peter.

There are a Dell desktop connected.

Here you are the outputs:

SW3#sh run int f0/15

Building configuration...

Current configuration : 166 bytes

!

interface FastEthernet0/15

description USUARIOS

switchport mode access

no snmp trap link-status

storm-control broadcast level 1.00

spanning-tree portfast

end

SW3#sh int f0/15 coun

Port            InOctets    InUcastPkts    InMcastPkts    InBcastPkts

Fa0/15         217592071        2277734            980          42361

Port           OutOctets   OutUcastPkts   OutMcastPkts   OutBcastPkts

Fa0/15         740616572        2505171         422773        4498833

SW3#sh int f0/15 coun errors

Port        Align-Err     FCS-Err    Xmit-Err     Rcv-Err  UnderSize  OutDiscards

Fa0/15              0           0           0           0          0            0

Port      Single-Col  Multi-Col   Late-Col  Excess-Col  Carri-Sen      Runts     Giants

Fa0/15             0          0          0           0          0          0          0

SW3#sh int f0/15 count proto status

Protocols allocated:

FastEthernet0/15: Other, IP, Spanning Tree, CDP

SW3#sh int f0/15 stats            

FastEthernet0/15

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

               Processor          0          0     167846   12569165

             Route cache          0          0          0          0

                   Total          0          0     167846   12569165

SW3#sh int f0/15 status

Port      Name               Status       Vlan       Duplex  Speed Type

Fa0/15    USUARIOS           notconnect   1            auto   auto 10/100BaseTX

Now there are anybody connected but normally the interface is a-100, a-full

Thank you!

[Jeff Van Houten]

Check the nic drivers and settings on the dells.

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