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Cisco Bug: CSCsg35506 - JQL: port-channel member in suspend due to flowcontrol mismatch .

Last Modified

Jan 28, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

12.2(18)SXF5

Description (partial)

Symptoms: After a Gigabit Ethernet (GE) interface has flapped, a mismatch may 
occur on a port channel, preventing the GE interface from joining the port 
channel. This situation occurs when the default flow control operational mode 
on the GE interface is unexpectedly changed from "off/off" to "on" after the 
GE interface has flapped.

If the symptom occurs for the first interface of a group of interfaces that 
is supposed to join the port channel, none of the interfaces in the group can 
join the port channel, degrading the bandwidth and possibly causing severe 
packet drops on the channel.

Conditions: This symptom is observed on a Cisco Catalyst 6000 series switch 
and Cisco 7600 series router, and affects the following modules:

- Supervisor Engines 1 and 1a

- Supervisor Engine 2

- WS-X6408-GBIC

- WS-X6416-GBIC

- WS-X6516-GBIC and WS-X6516A-GBIC

Note that the symptom does not occur with the WS-X6724-SFP and the
WS-X6748-GE-TX.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
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