Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Community Member

WS-C3550-12G - "link up" message, but no "link down" message

Hi Together,

using WS-C3550-12G with IOS 12.1(11)EA1.

On one link I get some "link up messages", without a "link down message" before.

Very Strange.

172-29-101-236#sh run int gigabitEthernet 0/1

Building configuration...

Current configuration : 177 bytes

!

interface GigabitEthernet0/1

description DB:Point2Point --> gi2/1@css01-07

switchport access vlan 101

switchport mode access

switchport nonegotiate

no ip address

end

172-29-101-236#show log | i 0/1,

Feb 9 14:15:41: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 12 22:46:02: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 13 10:20:07: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 17 15:12:31: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 17 15:14:46: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 17 15:16:04: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 17 15:17:07: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 17 15:17:46: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 18 12:15:39: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 18 12:26:06: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

Feb 18 15:25:11: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

172-29-101-236#

Feb 18 15:56:29: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

The interface counter looks fine:

172-29-101-236#sh int gigabitEthernet 0/1

GigabitEthernet0/1 is up, line protocol is up

Hardware is Gigabit Ethernet, address is 000a.8a97.6501 (bia 000a.8a97.6501)

Description: DB:Point2Point --> gi2/1@css01-07

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

reliability 255/255, txload 10/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex mode, link type is force-up, media type is SX

output flow-control is unsupported, input flow-control is unsupported, 1000Mb/s

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

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

Last input 00:00:40, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:16:15

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 5111000 bits/sec, 4443 packets/sec

5 minute output rate 41677000 bits/sec, 5410 packets/sec

4528752 packets input, 649071611 bytes, 0 no buffer

Received 1007 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 watchdog, 992 multicast, 0 pause input

0 input packets with dribble condition detected

5476254 packets output, 907447732 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

Anyone has an idea what could cause this message ?

thanks in advance

2 REPLIES
Silver

Re: WS-C3550-12G - "link up" message, but no "link down" message

Some errors such as line errors are momentary and not long enough to trigger a link down message. This could be the reason to see only the link up message with no corresponding link down message. You could try replacing the cables, but I don't see it as a serious issue unless you are receiving too many of these frequently.

Community Member

Re: WS-C3550-12G - "link up" message, but no "link down" message

Hi:

In my experience,

It could be the GBIC/fiber issue.

You can use light stream power meter

to ensure the light power is in the range.

Last time I solve it by adding a attenuators

in front of my LX GBIC link to ONS15252

before I replace the GBIC.

Regards

Kae Hsu

131
Views
0
Helpful
2
Replies
CreatePlease to create content