Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Nexus switch


I have inserted a 1000Base SFP in Nexus 5000 and SFP is also validated but still it's showing link not connected. Port status is as below

DELHALNPSW5548-01# sh int Eth1/20

Ethernet1/20 is down (Link not connected)

  Hardware: 1000/10000 Ethernet, address: 547f.eeab.1bdb (bia 547f.eeab.1bdb)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

  reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  Port mode is access

  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 00:21:10

  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


    0 unicast packets  0 multicast packets  0 broadcast packets

    0 input packets  0 bytes

    0 jumbo packets  0 storm suppression bytes

    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


    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

Hall of Fame Super Silver

Nexus switch

Could you post the configuration of the interface?

Can you tell us what is connected to the SFP? And can you verify that whatever is connected has activated its interface?



New Member

Nexus switch

I had this issue also when we first started configuring our N5ks a few months ago.  Even though the N5k recognized the SFP we had to configure the interface with "speed 1000" before the link would come up.

Hope this helps!

New Member

Nexus switch

Issue is resolved after changing the interface speed.