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Printer slowness after switch replacement


I am troubleshooting an issue with a Canon Plotter printer which was working fine until we replaced the old 3COM switch that it was connected to with a new Cisco Catalyst 2960-X. After the switch replacement the printer is very slow queuing the print job and talks hours to print a large image (250 MB pdf file). While troubleshooting I placed a small 5 port netgear switch in between and everything works fine again but without that mini-switch in between it is painfully slow.

The Plotter is a Canon iPF820 and when looking at the switch port it connects to, it is negotiating a 100 mbps at Full duplex and not showing any errors:

GigabitEthernet1/0/14 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 0038.df4c.0d8e (bia 0038.df4c.0d8e)
  MTU 1500 bytes, BW 100000 Kbit/sec, 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 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:02, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7761
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1000 bits/sec, 1 packets/sec
  5 minute output rate 3000 bits/sec, 2 packets/sec
     101863 packets input, 19812206 bytes, 0 no buffer
     Received 39119 broadcasts (31056 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 31056 multicast, 0 pause input
     0 input packets with dribble condition detected
     1023132 packets output, 392655932 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     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

The configuration on the port is as follows:

interface GigabitEthernet1/0/14
 switchport access vlan 30
 switchport mode access
 switchport nonegotiate
 spanning-tree portfast edge
 spanning-tree bpdufilter enable
 spanning-tree bpduguard enable

Any suggestions or ideas on what might be going on?


6 Replies 6

Julio E. Moisa
VIP Mentor VIP Mentor
VIP Mentor

Hi Raul

Please try with this config and keep us posted.

conf t

default interface GigabitEthernet1/0/14

interface GigabitEthernet1/0/14
switchport access vlan 30
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
duplex full
speed auto
no shutdown

Also I'm assuming your STP config is ok. Try to use rapid per vlan STP. 

Hope it is useful

>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

Thank you Julio

I tried the provided config but did not make a difference.

Can you execute this command line:

show interface g1/0/14  in order to see if there are errors. Have you changed the patch cord?

>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

Hello Raul,

Could you please share me the below

sh ver

sh mls qos

sh queuing int GigabitEthernet1/0/14

Is the output drops seen increasing on them?

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7761



DRCSW01#Sh ver

Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(5b)E, R                                                                             ELEASE SOFTWARE (fc2)
Technical Support:
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Wed 14-Sep-16 06:29 by prod_rel_team

ROM: Bootstrap program is C2960X boot loader
BOOTLDR: C2960X Boot Loader (C2960X-HBOOT-M) Version 15.2(3r)E1, RELEASE SOFTWAR                                                                             E (fc1)

DRCSW01 uptime is 9 weeks, 4 days, 22 hours, 8 minutes
System returned to ROM by power-on
System restarted at 14:22:24 Eastern Wed Dec 14 2016
System image file is "flash:/c2960x-universalk9-mz.152-5b.E.bin"
Last reload reason: power-on

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Importers, exporters, distributors and users are responsible for
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cisco WS-C2960X-48LPS-L (APM86XXX) processor (revision M0) with 524288K bytes of memory.
Processor board ID FOC2035Y32N
Last reset from power-on
2 Virtual Ethernet interfaces
1 FastEthernet interface
52 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:38:DF:4C:0D:80
Motherboard assembly number     : 73-16692-05
Power supply part number        : 341-0528-02
Motherboard serial number       : FOC203536P1
Power supply serial number      : DCC202993TB
Model revision number           : M0
Motherboard revision number     : A0
Model number                    : WS-C2960X-48LPS-L
Daughterboard assembly number   : 73-14200-03
Daughterboard serial number     : FOC20351Y6J
System serial number            : FOC2035Y32N
Top Assembly Part Number        : 68-100470-02
Top Assembly Revision Number    : B0
Version ID                      : V04
CLEI Code Number                : CMMLP00ARD
Daughterboard revision number   : A0
Hardware Board Revision Number  : 0x18

Switch Ports Model                     SW Version            SW Image
------ ----- -----                     ----------            ----------
*    1 54    WS-C2960X-48LPS-L         15.2(5b)E             C2960X-UNIVERSALK9-M

Configuration register is 0xF


DRCSW01#sh mls qos
QoS is enabled
QoS ip packet dscp rewrite is enabled


DRCSW01#sh queueing interface g1/0/14
Interface GigabitEthernet1/0/14 queueing strategy: none


Yes, the output drops seems to be increasing

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 9496


Thanks. This could be the output drops causing the slowness. Since the packets starts retransmits, it can worsen it. Output drops are not caused by Layer 1.  This could be due to buffer filling up. Please send me the below output to see which queue is dropping them. We can try tweak them to get rid of it.

sh mls qos interface g1/0/14 statistics 



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