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Cisco Bug: CSCun57644 - Altering a Unified port from FC to Eth mode can cause network outage

Last Modified

Mar 29, 2017

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.1(3a)A 2.2(1c)A

Description (partial)

If a user is re-purposing a unified port from Fiber channel mode to ethernet mode, and the port is connected to a chassis, user may experience network disruption on some vEthernet interfaces.

This problem happens because when a unified port is converted from a Fiber channel mode to ethernet mode, it automatically gets enabled and become an uplink port. Since this port is an uplink ports, vnics can re-pin itself to this newly connected uplink port. If this port is connected to a chassis instead of an upstream switch, the traffic would be dropped for all vnics that are pinned to that port.
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