05-20-2013 06:30 AM - edited 03-07-2019 01:27 PM
SW1#show interfaces fastEthernet 0/14 counters errors
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
Fa0/14 6682 140364 0 306468 0
Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants
Fa0/14 0 0 0 0 180103 0 2798
SW1#show interfaces fastethernet 0/14
FastEthernet0/14 is down, line protocol is down (err-disabled)
Hardware is Fast Ethernet, address is 0015.6204.1fce (bia 0015.6204.1fce)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 172/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is 100BaseTX
input flow-control is unsupported output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 3d00h, 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 0 bits/sec, 0 packets/sec
131027136 packets input, 2935317548 bytes, 0 no buffer
Received 7643 broadcasts (0 multicast)
0 runts, 2798 giants, 0 throttles
149844 input errors, 140364 CRC, 6682 frame, 0 overrun, 0 ignored
0 watchdog, 5267 multicast, 0 pause input
0 input packets with dribble condition detected
75240868 packets output, 1154829616 bytes, 0 underruns
0 output errors, 0 collisions, 4 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
What is problem with this port?
05-20-2013 06:40 AM
Hi Vladimir,
on first look your interface seems to be err-diabled (first line)
FastEthernet0/14 is down, line protocol is down (err-disabled)
Please look to syslog for reason why interface is err-disabled. There can be number of reasons. Please post running config of interface. Do you have security applied to interface?
Regards,
Jan
05-20-2013 06:45 AM
My configuration interface Fa0/14:
interface FastEthernet0/14
switchport access vlan 100
switchport mode access
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
spanning-tree portfast
05-20-2013 07:05 AM
Hi Vladimir,
are you able to check syslog messages? You should see reason in syslog. Please read this document to check all the resons mentioned:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00806cd87b.shtml
Jan
05-20-2013 08:03 AM
With the information provided and the way you have the interfaced configured I'm assuming this is an access port with some host connected to it (phone, PC, both perhaps). Since portfast disables BPDU's on the the interface I don't think you have a spanning tree issue causing the interface to go err-disable, especially if it is truly an access port connected to a non-switch device. My guess is a possible duplex mis-match. If the other side is hard coded to full duplex then int fa0/14 will fall back to half duplex as duplex is not negotiated. If the duplex is auto then on the host, the its possible you have a physical layer issue. At that point you'll have to trouble each physical compent to determine the issue (the NIC on the host, the cable, the port on the switch, etc).
05-20-2013 04:07 PM
reliability 172/255, txload 1/255, rxload 1/255
Your line error is possibly caused by an execessive amount of "line flaps". This is evident with the output. Under "reliabiltiy" the values should be 255/255 and nothing LESS.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide