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Cisco Bug: CSCut17477 - Random interface flaps on 6800IA/FEX host interfaces

Last Modified

Feb 24, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.1(2)SY4.1

Description (partial)

Symptom:
On a VSS switch pair with multiple IA's (FEX's) attached, FEX host ports are flapping randomly:

Mar  2 15:32:05.622: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/17, changed state to down (FEX-111)
Mar  2 15:32:13.780: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/17, changed state to up (FEX-111)
Mar  2 15:32:14.779: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/17, changed state to up (FEX-111)
Mar  2 15:38:17.577: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to down (FEX-107)
Mar  2 15:38:18.580: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/10, changed state to down (FEX-107)
Mar  2 15:38:21.303: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/10, changed state to up (FEX-107)
Mar  2 15:38:22.302: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to up (FEX-107)
Mar  2 16:23:49.611: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/12, changed state to down (FEX-109)
Mar  2 16:23:51.614: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/12, changed state to up (FEX-109)
Mar  2 16:24:40.607: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/12, changed state to down (FEX-109)

Conditions:
This issue is applicable to 6800IA setup (standalone or stacked), running 15.x SY releases.
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