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05-06-2013 11:09 AM - edited 03-07-2019 01:12 PM
I have two 2960s that periodically lose connection for just a few Seconds. If I run a continuous ping from a workstation the connection never drops but as soon as I kill the ping command I will start losing the connection again. All cables test fine tried different switch ports nothing seems to help. No errors in log file either.
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05-06-2013 12:46 PM
Try to isolate the physical interfaces involved and do a "show interface" to see if you can find an interface with errors, etc.
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05-06-2013 02:45 PM
Post the following command outputs from both switches:
1. sh interface
2. sh controller e
3. sh controller util;
4. sh version; and
5. sh post
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05-06-2013 04:01 PM
Switch #1
SW1#sh int gi 1/0/49
GigabitEthernet1/0/49 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is a418.75f8.ca31 (bia a418.75f8.ca31)
Description: ** UPlink to MDF SW 1 **
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 not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:07, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 9
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1554000 bits/sec, 127 packets/sec
5 minute output rate 67000 bits/sec, 80 packets/sec
445331589 packets input, 522114003437 bytes, 0 no buffer
Received 27642473 broadcasts (9785012 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 9785012 multicast, 0 pause input
0 input packets with dribble condition detected
308322649 packets output, 65890287562 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
SW1#sh controllers ethernet-controller gi 1/0/49
Transmit GigabitEthernet1/0/49 Receive
1465966315 Bytes 2424256154 Bytes
302217214 Unicast frames 417690904 Unicast frames
413323 Multicast frames 9785098 Multicast frames
5693301 Broadcast frames 17857581 Broadcast frames
0 Too old frames 2564845558 Unicast bytes
0 Deferred frames 773397611 Multicast bytes
0 MTU exceeded frames 1617280749 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 2264350 Minimum size frames
0 8 collision frames 54566268 65 to 127 byte frames
0 9 collision frames 28406223 128 to 255 byte frames
0 10 collision frames 4734711 256 to 511 byte frames
0 11 collision frames 14502167 512 to 1023 byte frames
0 12 collision frames 93793075 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 247066789 Valid frames, too large
0 Excess defer frames 0 Invalid frames, too small
557033 64 byte frames 0 Valid frames, too small
217426895 127 byte frames
61004706 255 byte frames 0 Too old frames
5520279 511 byte frames 0 Valid oversize frames
1282595 1023 byte frames 0 System FCS error frames
2093451 1518 byte frames 0 RxPortFifoFull drop frame
20438879 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames
SW1#sh controllers utilization
Port Receive Utilization Transmit Utilization
Gi1/0/1 0 0
Gi1/0/2 0 0
Gi1/0/3 0 0
Gi1/0/4 0 0
Gi1/0/5 0 0
Gi1/0/6 0 0
Gi1/0/7 0 0
Gi1/0/8 0 0
Gi1/0/9 0 0
Gi1/0/10 0 0
Gi1/0/11 0 0
Gi1/0/12 0 0
Gi1/0/13 0 0
Gi1/0/14 0 0
Gi1/0/15 0 0
Gi1/0/16 0 0
Gi1/0/17 0 0
Gi1/0/18 0 0
Gi1/0/19 0 0
Gi1/0/20 0 0
Gi1/0/21 0 0
Gi1/0/22 0 0
Gi1/0/23 0 0
Gi1/0/24 0 0
Gi1/0/25 0 0
Gi1/0/26 0 0
Gi1/0/27 0 0
Gi1/0/28 0 0
Gi1/0/29 0 0
Gi1/0/30 0 0
Gi1/0/31 0 0
Gi1/0/32 0 0
Gi1/0/33 0 0
Gi1/0/34 0 0
Gi1/0/35 0 0
Gi1/0/36 0 0
Gi1/0/37 0 0
Gi1/0/38 0 0
Gi1/0/39 0 0
Gi1/0/40 0 0
Gi1/0/41 0 0
Gi1/0/42 0 0
Gi1/0/43 0 0
Gi1/0/44 0 0
Gi1/0/45 0 0
Gi1/0/46 0 0
Gi1/0/47 0 0
Gi1/0/48 0 0
Gi1/0/49 0 0
Gi1/0/50 0 0
Gi1/0/51 0 0
Gi1/0/52 0 0
Total Ports : 52
Switch Receive Bandwidth Percentage Utilization : 0
Switch Transmit Bandwidth Percentage Utilization : 0
Stack Ring Percentage Utilization : 0
SW1#sh version
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 15.0(2)SE, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Sat 28-Jul-12 00:42 by prod_rel_team
ROM: Bootstrap program is C2960S board boot loader
BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(55r)SE, RELEASE SOFTWARE (fc1)
Lydia-IDF2-SW1 uptime is 6 weeks, 6 days, 11 hours, 6 minutes
System returned to ROM by power-on
System restarted at 07:46:27 EST Tue Mar 19 2013
System image file is "flash:c2960s-universalk9-mz.150-2.SE.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
cisco WS-C2960S-48LPS-L (PowerPC) processor (revision E0) with 131072K bytes of memory.
Processor board ID FOC1617Z2N7
Last reset from power-on
2 Virtual Ethernet interfaces
1 FastEthernet interface
52 Gigabit Ethernet interfaces
The password-recovery mechanism is disabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : A4:18:75:F8:CA:00
Motherboard assembly number : 73-11907-08
Power supply part number : 341-0393-02
Motherboard serial number : FOC16163BT5
Power supply serial number : DCA1603U3Z2
Model revision number : E0
Motherboard revision number : A0
Model number : WS-C2960S-48LPS-L
Daughterboard assembly number : 73-11933-04
Daughterboard serial number : FOC161713FN
System serial number : FOC1617Z2N7
Top Assembly Part Number : 800-30937-03
Top Assembly Revision Number : A0
Version ID : V03
CLEI Code Number : COMGZ00ARC
Daughterboard revision number : A0
Hardware Board Revision Number : 0x01
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C2960S-48LPS-L 15.0(2)SE C2960S-UNIVERSALK9-M
Configuration register is 0xF
SW1#sh post
Stored system POST messages:
Switch 1
---------
POST: MA BIST : Begin
FC 1 MBIST Test Passed.
DP Sg1 MBIST Test Passed.
DP Xg1 MBIST Test Passed.
NI 1 MBIST Test Passed.
FC 0 MBIST Test Passed.
DP Sg0 MBIST Test Passed.
DP Xg0 MBIST Test Passed.
NI 0 MBIST Test Passed.
UPB MBIST Test Passed.
POST: MA BIST : End, Status Passed
POST: TCAM BIST : Begin
POST: TCAM BIST : End, Status Passed
POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed
POST: Thermal, Fan Tests : Begin
POST: Thermal, Fan Tests : End, Status Passed
POST: PortASIC Stack Port Loopback Tests : Begin
POST: PortASIC Stack Port Loopback Tests : End, Status Passed
POST: PortASIC Port Loopback Tests : Begin
POST: PortASIC Port Loopback Tests : End, Status Passed
POST: EMAC Loopback Tests : Begin
POST: EMAC Loopback Tests : End, Status Passed
Switch #2
Core#sh int gi 1/1/1
GigabitEthernet1/1/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is a493.4c09.b031 (bia a493.4c09.b031)
Description: ** Uplink to IDF 2 SW 1 **
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 not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:24, 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: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 37000 bits/sec, 34 packets/sec
5 minute output rate 762000 bits/sec, 59 packets/sec
31574200 packets input, 6029560447 bytes, 0 no buffer
Received 770148 broadcasts (40593 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 40593 multicast, 0 pause input
0 input packets with dribble condition detected
45769800 packets output, 52965028270 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
Core#sh controllers ethernet-controller gi 1/1/1
Transmit GigabitEthernet1/1/1 Receive
1425456209 Bytes 1734617435 Bytes
42523254 Unicast frames 30804228 Unicast frames
1034607 Multicast frames 40595 Multicast frames
2212291 Broadcast frames 729587 Broadcast frames
0 Too old frames 1534906606 Unicast bytes
0 Deferred frames 9963968 Multicast bytes
0 MTU exceeded frames 63710525 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 58059 Minimum size frames
0 8 collision frames 22041014 65 to 127 byte frames
0 9 collision frames 7022253 128 to 255 byte frames
0 10 collision frames 560329 256 to 511 byte frames
0 11 collision frames 120376 512 to 1023 byte frames
0 12 collision frames 162879 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 1609500 Valid frames, too large
0 Excess defer frames 0 Invalid frames, too small
275104 64 byte frames 0 Valid frames, too small
5727508 127 byte frames
2853974 255 byte frames 0 Too old frames
508806 511 byte frames 0 Valid oversize frames
2033360 1023 byte frames 0 System FCS error frames
9389024 1518 byte frames 0 RxPortFifoFull drop frame
24982376 Too large frames
0 Good (1 coll) frames
Core#sh controllers utilization
Port Receive Utilization Transmit Utilization
Gi1/0/1 2 0
Gi1/0/2 0 0
Gi1/0/3 0 0
Gi1/0/4 0 0
Gi1/0/5 0 0
Gi1/0/6 0 0
Gi1/0/7 0 0
Gi1/0/8 0 0
Gi1/0/9 0 0
Gi1/0/10 0 0
Gi1/0/11 0 0
Gi1/0/12 0 0
Gi1/0/13 0 0
Gi1/0/14 0 0
Gi1/0/15 0 0
Gi1/0/16 0 0
Gi1/0/17 0 0
Gi1/0/18 0 0
Gi1/0/19 0 0
Gi1/0/20 0 0
Gi1/0/21 0 0
Gi1/0/22 0 0
Gi1/0/23 0 0
Gi1/0/24 0 0
Gi1/0/25 0 0
Gi1/0/26 0 0
Gi1/0/27 0 0
Gi1/0/28 0 0
Gi1/0/29 0 0
Gi1/0/30 0 0
Gi1/0/31 0 0
Gi1/0/32 0 0
Gi1/0/33 0 0
Gi1/0/34 0 0
Gi1/0/35 0 0
Gi1/0/36 0 0
Gi1/0/37 0 0
Gi1/0/38 0 0
Gi1/0/39 0 0
Gi1/0/40 0 0
Gi1/0/41 0 0
Gi1/0/42 0 0
Gi1/0/43 0 0
Gi1/0/44 0 0
Gi1/0/45 0 0
Gi1/0/46 0 0
Gi1/0/47 0 0
Gi1/0/48 0 0
Gi1/1/1 0 0
Gi1/1/2 0 1
Gi1/1/3 0 0
Gi1/1/4 0 10
Te1/1/1 0 0
Te1/1/2 0 0
Total Ports : 54
Switch Receive Bandwidth Percentage Utilization : 0
Switch Transmit Bandwidth Percentage Utilization : 0
Stack Ring Percentage Utilization : 0
Core#sh ver
Cisco IOS Software, C3750E Software (C3750E-IPBASEK9-M), Version 15.0(2)SE2, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Tue 05-Feb-13 11:53 by prod_rel_team
ROM: Bootstrap program is C3750E boot loader
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)
Lydia-MDF-Core uptime is 5 days, 1 hour, 13 minutes
System returned to ROM by power-on
System restarted at 17:46:38 EST Wed May 1 2013
System image file is "flash:c3750e-ipbasek9-mz.150-2.SE2.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
License Level: ipbase
License Type: Permanent
Next reload license Level: ipbase
cisco WS-C3750X-48P (PowerPC405) processor (revision A0) with 262144K bytes of memory.
Processor board ID FDO1617V1XJ
Last reset from power-on
3 Virtual Ethernet interfaces
1 FastEthernet interface
52 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
The password-recovery mechanism is disabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : A4:93:4C:09:B0:00
Motherboard assembly number : 73-12553-05
Motherboard serial number : FDO16171S7Z
Model revision number : A0
Motherboard revision number : D0
Model number : WS-C3750X-48P-S
Daughterboard assembly number : 800-32727-01
Daughterboard serial number : FDO16171E6V
System serial number : FDO1617V1XJ
Top Assembly Part Number : 800-31324-02
Top Assembly Revision Number : E0
Version ID : V02
CLEI Code Number : COMJZ00ARB
Hardware Board Revision Number : 0x03
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 54 WS-C3750X-48P 15.0(2)SE2 C3750E-IPBASEK9-M
Configuration register is 0xF
Core#sh post
Stored system POST messages:
Switch 1
---------
POST: CPU MIC register Tests : Begin
POST: CPU MIC register Tests : End, Status Passed
POST: MA BIST : Begin
POST: MA BIST : End, Status Passed
POST: TCAM BIST : Begin
POST: TCAM BIST : End, Status Passed
POST: SF ASIC BIST : Begin
POST: SF ASIC BIST : End, Status Passed
POST: Switch Fabric Memory Tests : Begin
POST: Switch Fabric Memory Tests : End, Status Passed
POST: CPU MIC interface Loopback Tests : Begin
POST: CPU MIC interface Loopback Tests : End, Status Passed
POST: PortASIC RingLoopback Tests : Begin
POST: PortASIC RingLoopback Tests : End, Status Passed
POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed
POST: Thermal, Fan Tests : Begin
POST: Thermal, Fan Tests : End, Status Passed
POST: PortASIC Port Loopback Tests : Begin
POST: PortASIC Port Loopback Tests : End, Status Passed
POST: PortASIC Macsec Loopback Tests : Begin
POST: PortASIC Macsec Loopback Tests : End, Status Passed
POST: EMAC Loopback Tests : Begin
POST: EMAC Loopback Tests : End, Status Passed
0 Good (>1 coll) frames
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05-06-2013 04:20 PM
Thanks for the output ... Here are what I've found, so far:
1. Uplinks are good. No line errors whatsoever.
2. The command "sh controller util" is a real-time snapshot. And this also shows not much utilzation (at either end).
3. The only thing I've noticed odd is the IOS for your 2960S. You're using 15.0(2)SE. I'd upgrade to either 15.0(2)SE2 or downgrade to 12.2(55)SE7.
Hmmmm ... If the continuous ping stops, the management IP address occasionally stops responding ... Never seen this before.
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05-06-2013 04:49 PM
Thanks for the help. To make this even stranger this is happening in two different buildings with the exact same configs. The third building with the exact same setup no problems what so ever. All of the buildings connect back to my main site via a fiber connection. The only difference is that the up link port on the building that has no problems is the following it has the native vlan assigned the others that are giving me the problems do not have this.
Site that works
interface GigabitEthernet1/1/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1,2,502
switchport mode trunk
mls qos trust cos
end
Sites that have the problem
Switch#1
switchport trunk encapsulation dot1q
switchport mode trunk
Switch#2
switchport trunk encapsulation dot1q
switchport mode trunk
Core switch at main site
Link to Switch#1
switchport trunk encapsulation dot1q
switchport mode trunk
load-interval 30
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
auto qos voip trust
Link to Switch#2
switchport trunk encapsulation dot1q
switchport mode trunk
load-interval 30
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
auto qos voip trust
Switch that has no problems
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1,2,502
switchport mode trunk
load-interval 30
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
auto qos voip trust
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05-06-2013 05:06 PM
Check your IOS. I remembered I had a fun experience with the IOS your 2960 is running.
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