All -
I have a Layer 2 stack of Cisco 3850 switches with the latest sw image. The switches have a large amount of printers connected to it since it is a County Publishing facility. When I look at the some of the switch ports where users are complaining of print jobs being delivered intermittently I see unknown protocol drops. I removed DTP and CDP after reviewing some of the information from the support forums and the problem continues to persist. The printer port is TCP LPD 515. I performed a packet capture and I am unable to find the problem.
See config info below. Please help.
Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 56 WS-C3850-48P 03.07.00E cat3k_caa-universalk9 INSTALL
2 56 WS-C3850-48P 03.07.00E cat3k_caa-universalk9 INSTALL
Current configuration : 253 bytes
!
interface GigabitEthernet2/0/18
description to B18 Xerox Nuvera Printer
switchport access vlan 209
switchport mode access
switchport nonegotiate
power inline never
speed 1000
duplex full
no cdp enable
spanning-tree portfast
end
X001#sh int g2/0/18
GigabitEthernet2/0/18 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 00e1.6d38.f912 (bia 00e1.6d38.f912)
Description: to B18 Xerox Nuvera PrinterA 10.60.10.20
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/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 00:00:02, output never, output hang never
Last clearing of "show interface" counters 00:32:17
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 0 bits/sec, 0 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
2212 packets input, 473000 bytes, 0 no buffer
Received 102 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
4148 packets output, 419599 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
32 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
