03-10-2015 02:35 AM - edited 03-07-2019 11:01 PM
Hi all,
I have a problem with a 3750X and SFP-ports that are unusable. This particular switch was recently installed in a stack with two other switches of the exact same type together with an older 3750. But since I couldn’t find a solution to the problem, I removed the switch from the stack in order to perform tests. The stack (switch 1-3) has been working for at least two years without problems.
All switch diagnostic tests report “successful” and resetting the switch changes nothing.
Port 1-12 are unusable and port 13-24 works perfectly.
Stack info (show version)
1 52 WS-C3750-48TS 12.2(55)SE5 C3750-IPBASEK9-M
2 30 WS-C3750X-24S 12.2(55)SE5 C3750E-IPBASEK9-M
3 30 WS-C3750X-24S 12.2(55)SE5 C3750E-IPBASEK9-M
4 30 WS-C3750X-24S 12.2(55)SE5 C3750E-IPBASEK9-M (problem switch)
Scenario
Install an SFP module (Cisco LX, SMF) in port 12 and 13.
First, all ports are empty.
Show run:
!
interface GigabitEthernet4/0/12
!
interface GigabitEthernet4/0/13
!
Show interfaces status:
Gi4/0/12 notconnect 1 auto auto Not Present
Gi4/0/13 notconnect 1 auto auto Not Present
Now I put an SFP in port 13
*Mar 1 17:18:37.683: %LINK-3-UPDOWN: Interface GigabitEthernet4/0/13, changed state to up
*Mar 1 17:18:38.690: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet4/0/13, changed state to up
Show interfaces status:
Gi4/0/12 notconnect 1 auto auto Not Present
Gi4/0/13 connected 1 full 1000 1000BaseLX SFP
show controllers ethernet-controller gi 4/0/13 phy detail:
GigabitEthernet4/0/13 (gpn: 175, port-number: 13)
-----------------------------------------------------------
General SFP Information
-----------------------------------------------
Identifier : 0x03
Connector : 0x07
Transceiver : 0x00 0x00 0x00 0x02 0x12 0x00 0x0D 0x01
Encoding : 0x01
BR_Nominal : 0x0D
Vendor Name : CISCO-FINISAR
Vendor Part Number : FTLF1319P2BCL-C4
Vendor Revision : 0x41 0x30 0x20 0x20
Vendor Serial Number : FNS171003CQ
-----------------------------------------------
Other Information
-------------------------------------------------------
Port asic num : 2
Port asic port num : 0
XCVR init completed : 1
Embedded PHY : not present
SFP presence index : 13
SFP iter cnt : 491988
SFP failed oper flag : 0x0
IIC error cnt : 0
IIC error dsb cnt : 0
IIC max sts cnt : 5
Chk for link status : 1
Link Status : 1
Link Status Media : 1
Preferred media : 0
Resolved Media : 1
Config Media : 1
Access Count : 0
Access Count Max : 2
Port Tx Fault : no
Port Tx Disable : no
. . . .
Show interface gi4/0/13:
GigabitEthernet4/0/13 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 5057.a82b.e50d (bia 5057.a82b.e50d)
MTU 1500 bytes, BW 1000000 Kbit, 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 1000BaseLX 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 00:00:01, 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
28 packets input, 7021 bytes, 0 no buffer
Received 28 broadcasts (21 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 21 multicast, 0 pause input
0 input packets with dribble condition detected
253 packets output, 22222 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
Now, I remove the SFP from port 13 and plug it into port 12 instead.
*Mar 1 17:37:09.425: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet4/0/13, changed state to down
*Mar 1 17:37:10.432: %LINK-3-UPDOWN: Interface GigabitEthernet4/0/13, changed state to down
Note the absence of link changes on port 12.
Show interfaces status:
Gi4/0/12 notconnect 1 full 1000 1000BaseLX SFP
Gi4/0/13 notconnect 1 auto auto Not Present
GigabitEthernet4/0/12 (gpn: 174, port-number: 12)
-----------------------------------------------------------
General SFP Information
-----------------------------------------------
Identifier : 0x03
Connector : 0x07
Transceiver : 0x00 0x00 0x00 0x02 0x12 0x00 0x0D 0x01
Encoding : 0x01
BR_Nominal : 0x0D
Vendor Name : CISCO-FINISAR
Vendor Part Number : FTLF1319P2BCL-C4
Vendor Revision : 0x41 0x30 0x20 0x20
Vendor Serial Number : FNS171003CQ
-----------------------------------------------
Other Information
-------------------------------------------------------
Port asic num : 1
Port asic port num : 26
XCVR init completed : 1
Embedded PHY : not present
SFP presence index : 12
SFP iter cnt : 499832
SFP failed oper flag : 0x0
IIC error cnt : 0
IIC error dsb cnt : 0
IIC max sts cnt : 5
Chk for link status : 1
Link Status : 0
Link Status Media : 0
Preferred media : 0
Resolved Media : 1
Config Media : 1
Access Count : 0
Access Count Max : 2
Port Rx Loss : yes
Port Tx Fault : no
Port Tx Disable : no
. . . .
Show interface gi4/0/12:
GigabitEthernet4/0/12 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 5057.a82b.e50c (bia 5057.a82b.e50c)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 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 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, 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
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
Does anyone have any ideas?
Regards,
Anders Fredriksson
03-10-2015 06:14 AM
Could be just a bad switch. Have you done the test with the switch removed from the stack?
03-11-2015 02:14 AM
It is removed from the stack.
03-11-2015 05:06 AM
Is port 12 the only problematic one, or are there others that don't link up (with the same SFP)? Are you testing with another device connected to the SFP, or simply by "looping" the SFP's Tx and Rx (in case it's not a single-fiber one)? Does "show post" output any failed tests?
Ports do fail sometimes - either individually (I have a C2960G with just one port that won't come up) or in groups, if ASICs are damaged (I have a C3750E with ports 1 to 4 down because of failed POST tests - in that case it's not even possible to "no shut" them).
10-14-2015 01:47 AM
Hi,
Problem solved by getting new a switch from Cisco. It was some kind of strange HW problem.
/Anders
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