3750 trunk taking undersize error

[Vinayaka Raman]

       I am taking only undersize errors on catalyst 3750 trunk interface (attached some outputs)...the other end is a 4500 switch and the interface is clean..can this be related to any bug ? this is my rootport and often leading to trouble sometims STP BPDUs transportations are affected..

[acampbell]

Vinayaks,

I think you need to look at the 4500 end too

Undersize frames

These are the total number of packets received that were less than 64 octets long (which exclude framing bits, but include FCS) and have a good FCS value.

This is an indication of a bad frame generated by the connected device. Verify that the connected device operates correctly.

Check that the configurations at both ends are compatable

speed , duplex, encapsulation etc

Regards,
Alex.
Please rate useful posts.

[Vinayaka Raman · Accepted solution]

my 4500 side is clean..

CS1#show int gi 5/4
GigabitEthernet5/4 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 0021.5510.5d0b (bia 0021.5510.5d0b)
  Description: Connection to NANWKPIPECS17 - LX/SM
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 6/255, rxload 4/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLH
  Media-type configured as SFP connector
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:06, output never, output hang never
  Last clearing of "show interface" counters 2w4d
  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 18382000 bits/sec, 3402 packets/sec
  5 minute output rate 25010000 bits/sec, 4611 packets/sec
     2860067000 packets input, 1769803265002 bytes, 0 no buffer
     Received 46896505 broadcasts (45558472 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     3341466913 packets output, 2215088280713 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 output buffer failures, 0 output buffers swapped out

CS1#show run int gi 5/4
Building configuration...

Current configuration : 108 bytes
!
interface GigabitEthernet5/4
description Connection to NANWKPIPECS17 - LX/SM
switchport mode trunk
end

[acampbell]

Vinayaka,

Can you show :-

from the 3750

sh run int g1/0/1

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

From the 4500

show int gi 5/4 controller

(Sorry about the VIP & rating, dont know what happened when I

was browsing)

Regards,
Alex.
Please rate useful posts.

[Vinayaka Raman]

3750 side:

CS17#show run int gi 1/0/1
Building configuration...

Current configuration : 251 bytes
!
interface GigabitEthernet1/0/1
description NANWKMDFCS1 - LX/SM
switchport trunk encapsulation dot1q
switchport mode trunk
mls qos trust dscp
storm-control broadcast level 5.00
storm-control multicast level 5.00
storm-control action trap
end

4500 side

CS1#show int gi 5/4 controller

GigabitEthernet5/4 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is 0021.5510.5d0b (bia 0021.5510.5d

0b)

  Description: Connection to NANWKPIPECS17 - LX/SM

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

     reliability 255/255, txload 11/255, rxload 10/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

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

  Media-type configured as SFP connector

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

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

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

  Last clearing of "show interface" counters 2w5d

  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 42070000 bits/sec, 5790 packets/sec

  5 minute output rate 44038000 bits/sec, 5899 packets/sec

     3039881146 packets input, 1878868924996 bytes, 0 no buffer

     Received 49200868 broadcasts (47790596 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 input packets with dribble condition detected

     3555613209 packets output, 2371295852996 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 output buffer failures, 0 output buffers swapped out