Nexux 5010: GLC-T stays down

[PETER EIJSBERG]

We have a Nexus 5010 on 4.1(3)N2(1) with a GLC-T SFP (1000BaseT) in port 1/1. I've set the speed to 1000 Mbps, the transceiver is recognized but whatever we do, the port remains " down (Link not connected)". Swapping cables or SFPs does not make any result, the link stays down.

According to the datasheet this SFP is supported but we can't get it to work.

Any ideas what could cause it?

Thanks

Peter

Ethernet1/1 is down (Link not connected)

  Hardware: 1000/10000 Ethernet, address: 0005.9b70.7f88 (bia 0005.9b70.7f88)

  Description: Server Ports GigEth / 10GigEth

  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

  Last link flapped never

  Last clearing of "show interface" counters 00:14:14

  1 minute input rate 0 bits/sec, 0 packets/sec

  1 minute output rate 0 bits/sec, 0 packets/sec

  Rx

    0 input packets 0 unicast packets 0 multicast packets

    0 broadcast packets 0 jumbo packets 0 storm suppression packets

    0 bytes

  Tx

    0 output packets 0 multicast packets

    0 broadcast packets 0 jumbo packets

    0 bytes

    0 input error 0 short frame 0 watchdog

    0 no buffer 0 runt 0 CRC 0 ecc

    0 overrun  0 underrun 0 ignored 0 bad etype drop

    0 bad proto drop 0 if down drop 0 input with dribble

    0 input discard

    0 output error 0 collision 0 deferred

    0 late collision 0 lost carrier 0 no carrier

    0 babble

    0 Rx pause 0 Tx pause

  0 interface resets

!

[gurpreetabdal]

My problem was resolved by specifying speed. So, it looks like by default, switch thinks that it need to operate GLC-T in 10G, which it can't. So doing this manual fix of specifying speed helps fix the issue.

N5K# sh int eth1/21 transceiver calibrations
Ethernet1/21
    transceiver is present
    type is SFP-1000BASE-T
    name is CISCO-METHODE  
    part number is SP7041_Rev_F   
    revision is F  
    serial number is 00000MTC162802H3
    nominal bitrate is 1300 MBit/sec
    Link length supported for copper is 100 m
    cisco id is --
    cisco extended id number is 4

SFP calibration is invalid

N5K(config)# int e1/21
DATACORE1(config-if)# speed 1000
DATACORE1(config-if)# shut
DATACORE1(config-if)# no shut

DATACORE1# sh int status

--------------------------------------------------------------------------------
Port          Name               Status    Vlan      Duplex  Speed   Type
--------------------------------------------------------------------------------

Eth1/21       --                 connected 1         full    1000    SFP-1000BAS

[vdsudame]

this is already part of our Cisco documentation

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/layer2/502_n1_1m/Cisco_n5k_layer2_config_gd_rel_502_N1_1_chapter3.html#task_1266647

[Arumuga Raj Shanmugam]

Hi

I have this same problem as " Ethernet is down Link not connected" in Nexus 7010 Switch.

Since i trying to connect the SFP in one of the Module in N7k. The port is in shutdown mode when i given the command "no shutdown" the LED of the particular port disabled.

GSSO-AGG-N7K-03# sh int eth 7/18

Ethernet7/18 is down (SFP not inserted)

Dedicated Interface

  Hardware: 10000 Ethernet, address: 0026.cbcd.6549 (bia 0026.cbcd.6549)

  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec

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

  Encapsulation ARPA

  Port mode is trunk

  auto-duplex, auto-speed

  Beacon is turned off

  Auto-Negotiation is turned off

  Input flow-control is off, output flow-control is off

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped never

  Last clearing of "show interface" counters never

  0 interface resets

  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  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

GSSO-AGG-N7K-03#

Ports  Module-Type                                                 Model              Status

-----  -----------------------------------                                  ------------------        ----------

32     10 Gbps Ethernet Module                           N7K-M132XP-12      ok

48     10/100/1000 Mbps Ethernet Module            N7K-M148GT-11      ok

0      Supervisor module-1X                                  N7K-SUP1           active *

0      Supervisor module-1X                                  N7K-SUP1           ha-standby

32     10 Gbps Ethernet Module                            N7K-M132XP-12      ok

NXOS  is :

kickstart: version 5.2(5)

system:    version 5.2(5)

In the below link i didnt find the compaitblity of module   M132XP.

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#wp139256

Any idea ?

[martinreinwein]

Hi Arumuga,

Did you try to set the speed?

We had issues with the GLC-T SFPs in Nexus-5548 and had to specify "speed 1000" to make it work.

Thanks,

Martin

[Leo Laohoo]

GSSO-AGG-N7K-03# sh int eth 7/18
Ethernet7/18 is down (SFP not inserted)

Maybe this is the reason?