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Cisco Bug: CSCvs13353 - 10G link not coming up after changing transceiver from 1G to 10G

Last Modified

Sep 14, 2020

Products (61)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 3548-XL Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 92304QC Switch
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Known Affected Releases

6.0(2)A8(3) 7.0(3)I7(6) 9.3(2)

Description (partial)

After being changed transceiver from 1G to 10G, Link do not come up.

Connections :
N3K-C3548P-10GX <----------------------->N3K-C3048TP-1GE

When transceivers are swapped from an 1000base SFP to an 10Gbase-SR SFP, Link won't come up.
Either Link of status will be "(linkFlapErrDisabled)" or  (Link not connected).

1)  Set manual speed 1000 with 1G SFP. (port is up and running here)
2)  Swapped with 10G SFP, link goes down.
3)  Tried to change speed to auto and manual to 10G as well, port won't come up.
4)  Tried to shut/no shut didn't work.
5)  Tried to default interface config, didn't work, port remains still down.
Above steps performed on both boxes  N3K-C3548P-10GX <------->N3K-C3048TP-1GE parallelly.

Tested with  6.0(2)A8(3), 6.0(2)A8(11), 7.0(3)I7(6) and 9.3(2) code, same issue seen.

[+]  when transceivers are swapped from an 1000base to an 10Gbase-SR.
[+]  when we first set manual speed to 1000 with 1G SFP then swap with 10G SFP.
[+]  when speed is auto with 1G SFP then swap with 10G SFP, issue is not seen.
[+]  Also when we install 10G SPF at first time, it will work fine.
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