08-24-2017 09:15 AM - edited 03-08-2019 11:49 AM
I have 5 - C2960X-48FPS-L switches recently installed and we are seeing random network link drops thoughout the network on a daily basis. Sometimes it's the same port, sometimes it's a port that has never bounced before. We are seeing this across all 5 switches and across devices that are POE and those that are not. The POE devices never lose power. The log is below.
I have run a test cable tdr and all shows normal. Those results are below as well. I have had the cables certfied as good as well. This happens on our Voip phones as well as regualr data ports. Any help would be apprecialted.
Aug 24 13:33:45.795: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/22, changed state to down
Aug 24 13:33:46.809: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/22, changed state to down
Aug 24 13:33:49.556: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/22, changed state to up
Aug 24 13:33:51.569: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/22, changed state to up
Aug 24 13:36:40.348: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to down
Aug 24 13:36:41.361: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to down
Aug 24 13:36:44.035: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to up
Aug 24 13:36:45.038: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to up
Aug 24 14:01:37.877: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to down
Aug 24 14:01:38.884: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to down
Aug 24 14:01:41.593: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to up
Aug 24 14:01:42.593: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to up
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/3 1000M Pair A 42 +/- 10 meters Pair A Normal
Pair B 42 +/- 10 meters Pair B Normal
Pair C 42 +/- 10 meters Pair C Normal
Pair D 42 +/- 10 meters Pair D Normal
08-24-2017 09:49 AM - edited 08-24-2017 10:04 AM
A quick note, we just installed these switches and went from a 10/100 Adtran POE to these. I have been moving the ports that are bounding back to the Adtran switch and the up/down issue does away.
Thanks again
08-24-2017 02:04 PM
08-24-2017 02:41 PM
Why would I see a network link drop on a logon or logoff? The link is a physical connection, right?
08-24-2017 03:08 PM
08-24-2017 03:12 PM
Hello
On the ports:
int x/x
no logging event link-status
That will negate these msgs being logged in the buffer
res
Paul
08-24-2017 03:13 PM
But the problem is I am actually dropping network link on IP Phones and dropping calls. I am losing the link to workstations and it is causing issues.
I have opened a Tac case with Cisco.
08-24-2017 03:24 PM
Hello
Apologies mis interpreted your OP.
So do these ports power the phones and do the workstations hang off the phones?
If so, Are the ports configured correctly for the power consumption and qos markings orignating from the phones?
Do the worksations drop off when physcaly connected without a phone?
res
Paul
08-24-2017 03:34 PM
Hey Paul,
So some of the ports are phones, some are PC's, some are printers. When the link drops, the power does not drop of the phone, just the link and it is down for about 6 seconds. Long enough for the phone system to lose contact with the phone and the phone has to reregister. It also happens on printers, but it is not noticed on the printer as it takes an extra couple of seconds to print the document, if someone happens to be printing when it disconnects.
Power consumption is less that 50% on the switch. The dropoff is across all devices. Most are not noticed on the workstations as it is quick.
08-24-2017 03:25 PM
08-24-2017 03:34 PM
c2960x-universalk9-mz.152-2.E6.bin
08-24-2017 04:12 PM - edited 08-24-2017 04:18 PM
While I'm trawling through the known bugs for 15.2(2)E6, may I request if you can provide the complete output to the following commands:
1. sh interface Gi1/0/22 contr; and
2. sh interface Gi1/0/3 contr
Are the issues only happening to wired clients connected to phones? I mean if the PCs are connected straight, is the problem the same?
08-24-2017 06:32 PM
This happens even to ports that jsut have printers on them. I did haveto move a couple of the devices to different switches so they users could work. Below is the output from a Sh Gi1/0/11 which still has a printer hooked up to it and it just went down got 5 seconds a couple minutes ago.
GigabitEthernet1/0/11 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 00c1.b15e.680b (bia 00c1.b15e.680b)
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 never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 345
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 2000 bits/sec, 2 packets/sec
5 minute output rate 14000 bits/sec, 14 packets/sec
1442404 packets input, 243118270 bytes, 0 no buffer
Received 12762 broadcasts (11969 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 11969 multicast, 0 pause input
0 input packets with dribble condition detected
7985568 packets output, 1263778960 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
Transmit GigabitEthernet1/0/11 Receive
1263789865 Bytes 243120694 Bytes
1701278 Unicast frames 1429661 Unicast frames
3205505 Multicast frames 11969 Multicast frames
3078891 Broadcast frames 793 Broadcast frames
0 Too old frames 240797432 Unicast bytes
0 Deferred frames 2272510 Multicast bytes
0 MTU exceeded frames 50752 Broadcast bytes
0 1 collision frames 0 Alignment errors
0 2 collision frames 0 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 0 Undersize frames
0 5 collision frames 0 Collision fragments
0 6 collision frames
0 7 collision frames 170627 Minimum size frames
0 8 collision frames 464059 65 to 127 byte frames
0 9 collision frames 759684 128 to 255 byte frames
0 10 collision frames 1136 256 to 511 byte frames
0 11 collision frames 1095 512 to 1023 byte frames
0 12 collision frames 45822 1024 to 1518 byte frames
0 13 collision frames 0 Overrun frames
0 14 collision frames 0 Pause frames
0 15 collision frames
0 Excessive collisions 0 Symbol error frames
0 Late collisions 0 Invalid frames, too large
0 VLAN discard frames 0 Valid frames, too large
0 Excess defer frames 0 Invalid frames, too small
2125522 64 byte frames 0 Valid frames, too small
3212446 127 byte frames
2106841 255 byte frames 0 Too old frames
184634 511 byte frames 0 Valid oversize frames
118396 1023 byte frames 0 System FCS error frames
237829 1518 byte frames 0 RxPortFifoFull drop frame
6 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames
Data1#
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