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Cisco Bug: CSCur55469 - In UCS, changing the native VLAN in uplink causes link flap

Last Modified

Mar 15, 2016

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.1(1a)B

Description (partial)

Symptom:
-When a user modifies the native VLAN on the uplinks for the fabric interconnects, a link flap will occur

-This change can be done in the GUI or via CLI

-There is no notification to the user that changing the native VLAN will force the links to flap

Conditions:
-In normal environment where user changes the native VLAN

-In a correctly configured environment, no major negative issues would occur. However if there are any misconfigurations such as incorrectly set disjoint layer 2 settings, a link flap could force traffic out the incorrect interface and cause an outage
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