Field Notice: FN - 64178 - N2K-C2232TM-E FEX 10G Port Speed Auto-Negotiation Failure - Replace on Failure

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Publish Date	Comments
1.0	16-Aug-16	Initial Release
10.0	19-Oct-17	Migration to new field notice system
10.1	23-Jul-21	Updated the Workaround/Solution Section

Products Affected

Affected Product ID	Comments
N2K-C2232TM-E
N2K-C2232TM-E-10G=
N2K-C2232TM-E-10GE

Defect Information

Defect ID	Headline
CSCux14029	10G Auto-negotiation issue between 2232TM-E FEX and 10G partners

Problem Description

10G capable devices auto-negotiate to 1G when connected to Nexus 2232TM-E FEX. Some devices also exhibit non-stomped cyclic redundancy check (CRC) errors RX into the Fabric Extender (FEX) ports while in 10G mode.

Background

High ripple noise to the 10G PHY, caused by part-to-part variation in the 2232TM-E FEX, results in some ports that fail to negotiate to 10G.

This issue is NOT seen on all 2232TM-E FEX units and manifests over time in as little as a few weeks of FEX operation.

If the FEX hits Cisco bug ID CSCux14029, a FEX reload has no positive impact on port speed negotiation.

THESE PRODUCTS ARE IMPACTED BY THIS ISSUE:

N2K-C2232TM-E, N2K-C2232TM-E-10GE, and N2K-C2232TM-E-10G= with any of these Hardware Versions: 1.0, 1.1, 2.0, 2.1, 2.2, or 2.3.

N2K-C2232TM-E, N2K-C2232TM-E-10GE, and N2K-C2232TM-E-10G= products with a Hardware Version 3.0 or later are NOT impacted.

Problem Symptom

The problem symptoms are:

• All or some ports on the FEX fail to negotiate to 10G. Ports will negotiate to 1G.

  Port negotiated at 1G:

  esc-6004-A# show interface Ethernet
  
  	161/1/1-32 brief | inc up
  
  	Eth161/1/12 1 eth access up none 1000(D) --
  
  	esc-6004-A#

  Port negotiated at 10G:

  esc-6004-A# show interface Ethernet
  
  	161/1/1-32 brief | inc up
  
  	Eth161/1/12 1 eth access up none 10G(D) --
  
  	esc-6004-A#

• Non-stomped CRC errors seen on the 2232TM-E FEX while in 10G mode.

  Sample output of the show RMON command is shown here:

  esc-6004-A# show platform software woodside rmon 0 hi3
  .
  .
  .
  161/1/1-32 brief | inc up
  | | | | RX_CRC_NOT_STOMPED | 843746| 2000|
  esc-6004-A#

  Note: If you see CRC non-stomped errors, you will also see output as shown in the next sample for all ports that do see CRC errors in the woodside dbg logs.

  Sample output of the woodside dbgexec show log command is shown here:

  esc-6004-A# dbgexec woo show log
07/17/2017 22:45:36.590434 |t| 0-HI3 : PORT:EMI RETRAIN INFO
07/17/2017 22:45:36.590533 |t| 0-HI3 : PORT:EMI RETRAIN INFO: Frequency of the most successful recent retrain = 1382417209800994901086282264912424104663336231431007581000376674887895746384644
07/17/2017 22:45:36.590891 |t| 0-HI7 : PORT:EMI RETRAIN INFO: MDI Pair Diff tone levels (uV) estimated on pair A = 0
07/17/2017 22:45:36.590959 |t| 0-HI3 : PORT:EMI RETRAIN INFO: MDI Pair Diff tone levels (uV) estimated on pair B = 0
07/17/2017 22:45:36.591038 |t| 0-HI3 : PORT:EMI RETRAIN INFO: MDI Pair Diff tone levels (uV) estimated on pair C = 0
07/17/2017 22:45:36.591096 |t| 0-HI3 : PORT:EMI RETRAIN INFO: MDI Pair Diff tone levels (uV) estimated on pair D = 0
07/17/2017 22:45:36.591148 |t| 0-HI : PORT:EMI RETRAIN INFO: SNR (dB) of pair A = 138241720980099490108628226491242410466333623143100758100037667488789574638464411125328654128836478841694187
07/17/2017 22:45:36.591487 |t| 0-HI7 : PORT:EMI RETRAIN INFO: SNR (dB) of pair B = 138241720980099490108628226491242410466333623143100758100037667488789574638464411125328654128836478841694187
07/17/2017 22:45:36.591834 |t| 0-HI7 : PORT:EMI RETRAIN INFO: SNR (dB) of pair C = 138241720980099490108628226491242410466333623143100758100037667488789574638464411125328654128836478841694187
07/17/2017 22:45:36.592192 |t| 0-HI7 : PORT:EMI RETRAIN INFO: SNR (dB) of pair D = 138241720980099490108628226491242410466333623143100758100037667488789574638464411125328654128836478841694187
07/17/2017 22:45:36.592549 |t| 0-HI7 : PORT:END OF EMI RETRAIN INFO esc-6004-A#

• Moving the network cable to a non-impacted 2232TM-E FEX brings the link up at 10G.

Workaround/Solution

Verify the current port speed. If the speed is reported as 1G, move the network cable to a port on FEX known to negotiate to 10G. If the port comes up as 10G, then the prior FEX is probably impacted by Cisco bug ID CSCux14029. Verify the FEX Hardware Version per the instructions in the "How to Identify Affected Products" section.

The FEX affected by this issue can be replaced through the standard Return Material Authorization (RMA) process using normal service support channels.

How To Identify Affected Products

In order to verify the FEX H/W Version, enter this command:

esc-6004-A#show sprom fex 161 backplane | begin Supervisor | include Part|Product|H/W|Serial

Product Number : N2K-C2232TM-E-10GE

Serial Number : SSI16140DYC

Part Number : 68-4482-02

Part Revision : C0

H/W Version : 1.1

esc-6004-A#

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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