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Cisco Bug: CSCvu35879 - 100G-QSFP CISCO-INNOLIGHT: individual 25G breakout lane does not linkup if other 25G lane admin down

Last Modified

Sep 15, 2020

Products (61)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 92304QC Switch
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Known Affected Releases

7.0(3)I7(7)

Description (partial)

Symptom:
individual 25G breakout lane(s) do(es) not link up after performing no shut/admin up

100G breakout 25Gb lane
                               1/20/2 ------------------------ NIC

N9K-C9336C-FX2-1# sh int br | in 1/20
Eth1/20/1     --      eth  routed down    Administratively down      auto(D) --
Eth1/20/2     --      eth  routed down    Link not connected         auto(D) --   <<  remains not connected
Eth1/20/3     --      eth  routed down    Administratively down      auto(D) --
Eth1/20/4     --      eth  routed down    Administratively down      auto(D) --

Conditions:
1. Cloudscale N9K platform

2.  100G Cisco-Innolight QSFP used in 100G port configured in 4x25G breakout mode 

example:
  
9K# show run | in breakout
        interface breakout module 1 port 20 map 25g-4x   

9K# sh int transceiver | in ^Eth|name|type | in INN p 2
Ethernet1/20/1 
    type is QSFP-100G-SR4-S    << 100G broken into 4x 25G  1/20/1-4
    name is CISCO-INNOLIGHT
Ethernet1/20/2
    type is QSFP-100G-SR4-S
    name is CISCO-INNOLIGHT
Ethernet1/20/3
    type is QSFP-100G-SR4-S
    name is CISCO-INNOLIGHT
Ethernet1/20/4
    type is QSFP-100G-SR4-S
    name is CISCO-INNOLIGHT
513E.C.14-N9K-C9336C-FX2-1#

3. Not all 4x 25G lanes are in use. Among the lanes that are not in use, at least one is configured admin down.
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