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Cisco Bug: CSCvs15521 - Incorrect interface up/down detection using QSFP-4X10G-LR-S breakout-cable

Last Modified

Jun 16, 2020

Products (214)

  • Cisco Catalyst 9500 Series Switches
  • Cisco Catalyst 9300-48UN-A Switch
  • Cisco Catalyst 3650-12X48UQ-L Switch
  • Cisco Catalyst 3850-48P-E Switch
  • Cisco Catalyst 3650-8X24UQ-E Switch
  • Cisco Catalyst 3850-48XS-F-S Switch
  • Cisco Catalyst 3850-24U-S Switch
  • Cisco Catalyst 9300L-48P-4G-E Switch
  • Cisco Catalyst 3650-48TQ-L Switch
  • Cisco Catalyst 3650-24TD-S Switch
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Known Affected Releases

16.12.1 Gibraltar-16.12.1

Description (partial)

Symptom:
When using QSFP-4X10G-LR-S on 9500-24Q interfaces status are not interpreted correctly. 
Topology:
MASTER                                                                                         CLIENT
9500-24Q [Fo2/0/13 (Te2/0/49-52)] <QSFP-4X10G-LR-S> [Fo1/0/1-4] 9500-12Q (seen as Forty but SFPs are 10G)

Seen from the client perspective (4x10G):
When we shutdown the Fo1/0/1 on the client side, Te2/0/49 and Te2/0/51 ports go down.
When we shutdown the Fo1/0/3 on the client side, Te2/0/49 and Te2/0/51 ports go down.  
When we shutdown the Fo1/0/2 on the client side, Te2/0/50 port go down (expected)
When we shutdown the Fo1/0/4 on the client side, Te2/0/52 port go down (expected)

In faulty scenario interfaces status on the client side is still up/up despite of lack of connectivity. On the master side it's down/down. 

Seen from the master (40G physical port, and 4 logical 10G):
When we shutdown the Te2/0/49 on the master side, Fo1/0/3 port go down. Lack of connectivity on Fo1/0/1 despite of up/up.
When we shutdown the Te2/0/51 on the master side, Fo1/0/1 port go down. Lack of connectivity on Fo1/0/3 despite of up/up.
When we shutdown the Te2/0/50 on the master side, Fo1/0/2 port go down (expected)
When we shutdown the Te2/0/52 on the master side, Fo1/0/4 port go down (expected)

Conditions:
1. 9500-24Q
2. IOS-XE 16.12.1
3. Using QSFP-4X10G-LR-S breakout cable.
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