Cisco Nexus 5548UP Link is not connected

uzair.infotech · ‎08-05-2014

I am trying to connect two Cisco Nexus 5548UP switches together using GLC-SX-MMD with multimode fiber but link is still down. Set the interface speed to 1000 and swap the SFP to other slot but result is still down. Kindly help me. Output is below

Switch-A# show int ethernet 1/31 brief

--------------------------------------------------------------------------------
Ethernet      VLAN    Type Mode   Status Reason                   Speed     Port
Interface                                                                    Ch #
--------------------------------------------------------------------------------
Eth1/31       1       eth trunk down    Link not connected         1000(D) --
Switch-A# show int ethernet 1/31 capabilities
Ethernet1/31
Model:                 N5K-C5548UP-SUP
Type (SFP capable):    10Gbase-(unknown)
Speed:                 1000,10000
Duplex:                full
Trunk encap. type:     802.1Q
Channel:               yes
Broadcast suppression: no
Flowcontrol:           rx-(off/on),tx-(off/on)
Rate mode:             none
QOS scheduling:        rx-(6q1t),tx-(1p6q0t)
CoS rewrite:           no
ToS rewrite:           no
SPAN:                  yes
UDLD:                  yes
Link Debounce:         yes
Link Debounce Time:    yes
MDIX:                  no
Pvlan Trunk capable:   yes
TDR capable:           no
FabricPath capable:    yes
Port mode:             Switched
FEX Fabric:            yes

Switch-A# show int ethernet 1/31 cable-diagnostics-tdr

--------------------------------------------------------------------------------
Interface Speed Pair Cable Length Distance to fault Channel Pair Status
-------------- ----- ---- -------------- ------------------- ------- -----------
Switch-A#

Switch-A# show int ethernet 1/31 transceiver calibrations
Ethernet1/31
    transceiver is present
    type is SFP-1000BASE-SX
    name is CISCO
    part number is FTLF8519P3BNL-CS
    revision is A
    serial number is FNS175111EN
    nominal bitrate is 1300 MBit/sec
    cisco id is --
    cisco extended id number is 4

                SFP Internal Calibrations Information
    ----------------------------------------------------------------------
                Slope Offset      Rx4/Rx3/Rx2/Rx1/Rx0
    ----------------------------------------------------------------------
    Temperature     0      0
    Voltage         0      0
    Current         0      0
    Tx Power        0      0
    Rx Power                       0.0000/0.0000/0.0000/0.0000/0.0000
    ----------------------------------------------------------------------

Switch-A# show int ethernet 1/31
Ethernet1/31 is down (Link not connected)
Dedicated Interface
Hardware: 1000/10000 Ethernet, address: 002a.6aa3.37c6 (bia 002a.6aa3.37c6)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec
reliability 0/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, 1000 Mb/s, media type is 10G
Beacon is turned off
Input flow-control is off, output flow-control is off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
Last link flapped never
Last clearing of "show interface" counters 00:54:36
30 seconds input rate 0 bits/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
    input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
RX
    0 unicast packets 98 multicast packets 0 broadcast packets
    98 input packets 720 bytes
    0 jumbo packets 0 storm suppression bytes
    98 runts 0 giants 0 CRC 0 no buffer
    98 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 errors 0 collision 0 deferred 0 late collision
    0 lost carrier 0 no carrier 0 babble 0 output discard
    0 Tx pause
0 interface resets

Switch-A#

Waqas Butt · ‎08-05-2014

Uzair,

It seems you are able to transmit successfully from Switch A, can you send across the log for Switch-B (Interface details)

Cheers,

Waqas

SANTHOSHKUMAR SARAVANAN · ‎08-05-2014

Hi ,

What is your nexus OS version ??

From Nexus OS version

http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/product_bulletin_c25-658155.html

HTH

Sandy

Zar Ni Lay Thwin · ‎08-05-2014

Hi,

Remove transceiver from that port and issue command " default interface ethernet 1/31"

And set the speed to 1000 " speed 1000 " and insert your transceiver into the port. After that configure the trunk configuration on that port.

let me know if it works.

uzair.infotech · ‎09-04-2014

Issue has been resolved as the fiber cable was faulty. After replacing the cable the issue has been resolved. Thanks for your support.

Telepe_CIC · ‎04-16-2019

Hi, how did you solve it?

I have the same issue :

HCSN5KLONEQ1# show int Eth1/28 brief

--------------------------------------------------------------------------------
Ethernet VLAN Type Mode Status Reason Speed Port
Interface Ch #
--------------------------------------------------------------------------------
Eth1/28 1 eth trunk down Link not connected 10G(D) 21

Thanks,

Jose Zapata

Telepe_CIC · ‎04-16-2019

I just saw the cable was faulty :)