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Cisco Bug: CSCuj64557 - N77-F3 : Module failed - not responding due to eUSB access failure

Last Modified

Jul 26, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(10)FM(0.35) 6.2(10)S67 6.2(12)S29 6.2(5.20)S1 6.2(5.52)S0 6.2(6)S23 6.2(6a)S13 7.1(0)D1(0.136) 7.1(0)D1(0.196)

Description (partial)

The eUSB (Embedded USB) module installed internally on the N77 F3 linecard may fail to respond to accesses from the local processor. Any of the following symptoms may be experienced when this occurs. (For Log examples please see the More-Info section).

(1) Line card gets kernel panic during runtime and is reloaded. "show logging onboard stack-trace" can be used to confirm this.  

(2) Line card is not reloaded but experiences eUSB failure during runtime.
The following command can be used to check for eUSB failure : "show system internal kernel messages". 

(3) Line card had PLOG failure and ISSU is performed on the failed module. ISSU will fail and line card will be reloaded with Upgrade Failure.

The access failure to the eUSB module on F3 linecard is related to a USB component marginality. It may occur with low probability of occurrence, on a limited set of hardware which uses the marginal component.  

The list of serial numbers potentially susceptible to this failure mode is as below , a total of 113 units. 
However it may be noted that only a subset of this list will actually experience any symptoms during operation. 
N77-F312CK-26  [34 units]
JAE18050366  JAE18050365  JAE1805035Y  JAE1805035U  JAE1805035Z  JAE18050360  JAE18050361 JAE18050367  JAE18050362  JAE18050363  JAE18050364  JAE1805035X  JAE1805035W  JAE1805035T JAE1805035S  JAE18050368  JAE1805035J  JAE1805035H  JAE1805035L  JAE1805035R  JAE1805035Q JAE1805035P  JAE1805035N  JAE18050359  JAE18050358  JAE18050356  JAE18050357  JAE1805035D JAE1805035C  JAE1805035A  JAE1805035B  JAE1805035E  JAE1805034W  JAE1805034X 

N77-F324FQ-25  [30 units]
JAE17500CM3	JAE17500CME	JAE17500CM6	JAE17500CM5	JAE17500CSB	JAE17500CM1	JAE17500CLW	JAE17500CLX	JAE17500CSC	JAE17500CLV	JAE17500CLB	JAE17500CM4	JAE17500CLZ	JAE17500CLC	JAE17500CLD	JAE17500CLE	JAE17500CLF	JAE17500CLG	JAE17500CLH	JAE17500CLJ	JAE17500CLM	JAE17500CLN	JAE17500CLP	JAE17500CLQ	JAE17500CLS	JAE17500CLU	JAE17500CLY	JAE17500CM0	JAE17500CSD	JAE17500CSE

N77-F348XP-23  [49 units]
JAE18040172	JAE18040173	JAE18040174	JAE18040175	JAE18040176	JAE18040177	JAE18040178	JAE18040179	JAE1804017A	JAE1804017B	JAE1804017C	JAE1804017D	JAE1804017F	JAE1804017G	JAE1804017H	JAE1804017J	JAE1804017K	JAE1804017L	JAE1804017M	JAE1804017N	JAE1804017R	JAE1804017S	JAE1804017T	JAE1804017U	JAE1804017V	JAE1804017W	JAE1804017X	JAE1804017Y	JAE18040180	JAE18040181	JAE18040182	JAE18040183	JAE18040184	JAE18040185	JAE18040186	JAE18040187	JAE18040188	JAE1804018A	JAE1804018B	JAE1804018C	JAE1804018D	JAE1804018E	JAE1804018F	JAE1804018G	JAE1804018H	JAE1804018J	JAE1804018K	JAE1804018L	 JAE180708R4 

Other F3 PIDs and Serial Numbers which do not belong to this list are NOT affected.
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