cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
4000
Views
10
Helpful
1
Replies

Link not connected on Nexus 3K

TuanAnhBui2203
Level 1
Level 1

Hi Guys,

I Have a Cisco Nexus 3K connect 2 link to 1 server by fiber link with 10Gbps multimode transceiver. We check the fiber power still receive and transmit laser on port but the switch show link not connected. Below is switch information

Software
BIOS: version 4.0.0
NXOS: version 9.2(4)
BIOS compile time: 12/05/2016
NXOS image file is: bootflash:///nxos.9.2.4.bin
NXOS compile time: 8/20/2019 7:00:00 [08/20/2019 22:52:22]


Hardware
cisco Nexus3000 C3064PQ Chassis
Intel(R) Celeron(R) CPU P4505 @ 1.87GHz with 3902220 kB of memory.
Processor Board ID FOC17280S91

 

When I show interface status:

 

show interface ethernet 1/11
Ethernet1/11 is down (Link not connected)
admin state is up, Dedicated Interface
Hardware: 100/1000/10000 Ethernet, address: 4c00.82c9.e432 (bia 4c00.82c9.e432)
Description: sip-01-p5p2
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, medium is broadcast
Port mode is access
auto-duplex, 10 Gb/s, media type is 10G
Beacon is turned off
Auto-Negotiation is turned off FEC mode is Auto
Input flow-control is off, output flow-control is off
Auto-mdix is turned off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
Last link flapped 00:13:41
Last clearing of "show interface" counters 04:04:24
105 interface resets
Load-Interval #1: 30 seconds
30 seconds input rate 0 bits/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 packets/sec
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
Load-Interval #2: 5 minute (300 seconds)
300 seconds input rate 0 bits/sec, 0 packets/sec
300 seconds output rate 0 bits/sec, 0 packets/sec
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
RX
0 unicast packets 0 multicast packets 0 broadcast packets
0 input packets 0 bytes
0 jumbo packets 0 storm suppression packets
0 runts 0 giants 0 CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
TX
0 unicast packets 0 multicast packets 0 broadcast packets
0 output packets 0 bytes
0 jumbo packets
0 output error 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble 0 output discard
0 Tx pause

 

When I show interface transceiver detail, It's still receive and transmit laser :

 

show interface ethernet 1/11 transceiver details
Ethernet1/11
transceiver is present
type is 10Gbase-SR
name is CISCO-SUMITOMO
part number is SPP5100SR-C5
revision is A
serial number is SPC162604VL
nominal bitrate is 10300 MBit/sec
Link length supported for 50/125um OM2 fiber is 82 m
Link length supported for 62.5/125um fiber is 26 m
Link length supported for 50/125um OM3 fiber is 300 m
cisco id is 3
cisco extended id number is 4
cisco part number is 10-2415-03
cisco product id is SFP-10G-SR

SFP Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 43.03 C 75.00 C -5.00 C 70.00 C 0.00 C
Voltage 3.28 V 3.63 V 2.97 V 3.46 V 3.13 V
Current 6.75 mA 10.50 mA 2.00 mA 9.00 mA 2.50 mA
Tx Power -2.51 dBm 1.69 dBm -11.30 dBm -1.30 dBm -7.30 dBm
Rx Power -2.48 dBm 1.99 dBm -13.97 dBm -1.00 dBm -9.91 dBm
Transmit Fault Count = 0
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning

 

Can anyone help me to resolve this issue ?

Thanks

1 Reply 1

Christopher Hart
Cisco Employee
Cisco Employee

Hello!

A few questions surrounding this issue:

  1. You stated that you have a Nexus 3064 connected "2 link to 1 server". Does this mean you have two different interfaces connected to the same server? Or do you have a second Nexus 3064 in a vPC domain with this switch, and the second Nexus also connects to this server? In either scenario, if there is a second link connecting to the server, is that link up and functioning without issue?
  2. Is the server's interface connected to this link enabled? I would suspect so, since typically link signal is not generated when an interface is administratively disabled, but it never hurts to double-check!
  3. Is the server's interface showing as up, or down?
  4. What type of transceiver is used on the server?
  5. What length of multimode fiber is used to connect these two devices?
  6. Was this link previously working and suddenly went down, or has it never worked?

Thank you!

-Christopher