05-03-2017 01:36 PM - edited 03-08-2019 10:25 AM
I have 2 Cisco 3750 stacked and two ports from each switch configured for ether-channel (LACP) as inter switch link between the Cisco and an HP switch (with trunking - LACP configured as well). On switch 1 I have port 1/0/25 and 1/0/26 and switch two 2/0/25 and 2/0/26. I notice that one of the ports (2/0/25) in that port-channel group showing a lot of input errors and CRC and increments at 30 seconds. There is no error at all on the HP fiber interface. I have done following:
So I assume it must be my layer 2 configuration or something that I have missed. Here is my configuration on the Cisco stacked 3750 and any help will be really apprecaited:
interface Port-channel1
description Uplink-HP4204vl
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
interface GigabitEthernet1/0/25
description Uplink-HP4204vl
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 1 mode active
interface GigabitEthernet1/0/26
description Uplink-HP4204vl
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 1 mode active
interface GigabitEthernet2/0/25
description Uplink-HP4204vl
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 1 mode active
interface GigabitEthernet2/0/26
description Uplink-HP4204vl
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 1 mode active
05-03-2017 01:47 PM
Post the complete output to the command "sh interface Gi 2/0/25 cont".
05-03-2017 01:51 PM
GigabitEthernet2/0/25 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 68bd.ab5d.d319 (bia 68bd.ab5d.d319)
Description: Uplink-HP4204vl
MTU 9000 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 8/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:58, output hang never
Last clearing of "show interface" counters 1d18h
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 34977000 bits/sec, 4440 packets/sec
5 minute output rate 21000 bits/sec, 34 packets/sec
762935088 packets input, 1022066320206 bytes, 0 no buffer
Received 1028228 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
5116 input errors, 5116 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 280962 multicast, 0 pause input
0 input packets with dribble condition detected
38758126 packets output, 51608682087 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
05-03-2017 03:05 PM
Hmmmm ... The output is incomplete. Can you please post the complete output to the command "sh controll e Gi 2/0/25".
Kindly paste the output in a text file and attach the file to your response.
05-03-2017 03:10 PM
Sorry I just did a show interface before. Here is the result for "sh interface Gi 2/0/25 cont"
#sh interface Gi 2/0/25 cont
GigabitEthernet2/0/25 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 68bd.ab5d.d319 (bia 68bd.ab5d.d319)
Description: Uplink-HP4204vl
MTU 9000 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 9/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:30, output hang never
Last clearing of "show interface" counters 1d20h
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 38952000 bits/sec, 5148 packets/sec
5 minute output rate 265000 bits/sec, 45 packets/sec
781344880 packets input, 1038592218276 bytes, 0 no buffer
Received 1073938 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
5273 input errors, 5273 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 301642 multicast, 0 pause input
0 input packets with dribble condition detected
38961274 packets output, 51690434996 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
Transmit GigabitEthernet2/0/25 Receive
400050820 Bytes 4065801379 Bytes
1575380911 Unicast frames 622757633 Unicast frames
88310020 Multicast frames 107030287 Multicast frames
73749537 Broadcast frames 227409547 Broadcast frames
0 Too old frames 2994025655 Unicast bytes
0 Deferred frames 3469563043 Multicast bytes
0 MTU exceeded frames 3715320023 Broadcast bytes
0 1 collision frames 0 Alignment errors
0 2 collision frames 798266 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 111690848 Undersize frames
0 5 collision frames 0 Collision fragments
0 6 collision frames
0 7 collision frames 2545501959 Minimum size frames
0 8 collision frames 3053778266 65 to 127 byte frames
0 9 collision frames 2057969685 128 to 255 byte frames
0 10 collision frames 992085991 256 to 511 byte frames
0 11 collision frames 502432603 512 to 1023 byte frames
0 12 collision frames 396161821 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
3108537147 64 byte frames 111690848 Valid frames, too small
3928599594 127 byte frames
1090988469 255 byte frames 0 Too old frames
509789108 511 byte frames 0 Valid oversize frames
266348160 1023 byte frames 0 System FCS error frames
1423112562 1518 byte frames 0 RxPortFifoFull drop frame
20 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames
05-03-2017 03:40 PM
798266 FCS errors
This is what I'm looking for. No Alignment Errors. No Symbol Error Frames. No System FCS Error Frams.
This is a Layer 1 issue. I notice this is a fibre optic link. Can I ask if you can replace the SFP module downstream?
05-03-2017 04:10 PM
Sure. Will try that out. However I cant figure out why downstream switch interfaces doesn't show any errors at all. And if you read my initial post I said that when I isolate (unplug fiber patch lead from both switch corresponding ports) the affected interface the errors move to the other interfaces
Will keep you posted
05-04-2017 10:45 PM
Disconnect that port i.e unplug the fiber patch lead at the Cisco end and the HP end and I notice it that the errors shows up on one of the 3 interface connected. i.e when I remove the cable from port 2/0/25 the error shows up on interface 1/0/25 and If I disconnect 1/0/25 the error shows up on 2/0/26
05-07-2017 02:40 PM
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 19:15 by nachen
Image text-base: 0x00003000, data-base: 0x01280000
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE4, RELEASE SOFTWARE (fc1)
lot-core-sw1 uptime is 1 year, 10 weeks, 5 days, 21 hours, 37 minutes
System returned to ROM by power-on
System restarted at 11:54:52 FJT Mon Feb 22 2016
System image file is "flash:c3750-ipservices-mz.122-35.SE5/c3750-ipservices-mz.122-35.SE5.bin"
cisco WS-C3750G-24TS-1U (PowerPC405) processor (revision H0) with 118784K/12280K bytes of memory.
Processor board ID FOC1437Y1MC
Last reset from power-on
2 Virtual Ethernet interfaces
56 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 68:BD:AB:5D:D1:80
Motherboard assembly number : 73-10219-09
Power supply part number : 341-0098-02
Motherboard serial number : FOC14373JXD
Power supply serial number : DCA143295P1
Model revision number : H0
Motherboard revision number : A0
Model number : WS-C3750G-24TS-E1U
System serial number : FOC1437Y1MC
Top Assembly Part Number : 800-27484-03
Top Assembly Revision Number : A0
Version ID : V05
CLEI Code Number : COMBL10BRA
Hardware Board Revision Number : 0x09
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 28 WS-C3750G-24TS-1U 12.2(35)SE5 C3750-IPSERVICES-M
2 28 WS-C3750G-24TS-1U 12.2(35)SE5 C3750-IPSERVICES-M
Switch 02
---------
Switch Uptime : 1 year, 10 weeks, 5 days, 21 hours, 44 minutes
Base ethernet MAC Address : 68:BD:AB:5D:D3:00
Motherboard assembly number : 73-10219-09
Power supply part number : 341-0098-02
Motherboard serial number : FOC14373M94
Power supply serial number : AZS1432035S
Model revision number : H0
Motherboard revision number : A0
Model number : WS-C3750G-24TS-E1U
System serial number : FOC1437Y1ME
Top assembly part number : 800-27484-03
Top assembly revision number : A0
Version ID : V05
CLEI Code Number : COMBL10BRA
Configuration register is 0xF
05-07-2017 02:54 PM
I've got a funny feeling this is an IOS bug.
05-03-2017 06:21 PM
Hi Leo,
Changing the fiber module and the fiber cable but still seeing errors after clearing the counters on those interface.
05-03-2017 07:09 PM
Changing the fiber module
Did you change the SFP of both sides or just one?
fiber cable
Is this patch cable a direct link or does it go to a FOBOT?
05-04-2017 07:53 PM
I just change the fiber module at the HP end as I don't have any spare for the Cisco end. Fiber cable is a direct link
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