【原创】关于Cisco Nexus XBAR 问题TS

[liu_zhimin]

故障日志：

2020 Apr 1 11:22:35.500 SW01 %$ VDC-1 %$ %FLN_XBAR-SLOT2-2-FLN_XBAR_FR_CRC: FLN6received packets with CRC error from MOD 1 through XBAR slot 1/inst 1

2020 Jul 15 01:38:01.172 SW01 %$ VDC-1 %$ %FLN_XBAR-SLOT2-2-FLN_XBAR_FR_CRC: FLN1 received packets with CRC error from MOD 1 through XBAR slot 1/inst 12020 Jul 26 07:04:37.901 SW01 %$ VDC-1 %$ %FLN_XBAR-SLOT2-2-FLN_XBAR_FR_CRC: FLN4 received packets with CRC error from MOD 1 through XBAR slot 1/inst 1
检查过程：

SW01# show module internal exceptionlog module 2
********* Exception info for module 2 ********
exception information --- exception instance 1 ----
Module Slot Number: 2
Device Id         : 190
Device Name       : Flanker Queue Driver
Device Errorcode  : 0xcbe036e2
Device ID         : 190 (0xbe)
Device Instance   : 03 (0x03)
Dev Type (HW/SW)  : 06 (0x06)
ErrNum (devInfo)  : 226 (0xe2)
System Errorcode  : 0x427a0020 error
Error Type        : Informational
PhyPortLayer      : Ethernet
Port(s) Affected  : Ethernet2/25-32
Error Description : FLN_QUE_INTR_EB_RO_NO_AM_NOTIFY
DSAP              : 0 (0x0)
UUID              : 0 (0x0)
Time              : Sun Jul 26 07:04:39 2020
                    (Ticks: 5F1CBA87 jiffies) 
 
exception information --- exception instance 2 ----
Module Slot Number: 2
Device Id         : 190
Device Name       : Flanker Queue Driver
Device Errorcode  : 0xcbe036e0
Device ID         : 190 (0xbe)
Device Instance   : 03 (0x03)
Dev Type (HW/SW)  : 06 (0x06)
ErrNum (devInfo)  : 224 (0xe0)
System Errorcode  : 0x427a0020 error
Error Type        : Informational
PhyPortLayer      : Ethernet
Port(s) Affected  : Ethernet2/25-32
Error Description : FLN_QUE_INTR_EB_RO_ERR
DSAP              : 0 (0x0)
UUID              : 0 (0x0)
Time              : Sun Jul 26 07:04:39 2020
                    (Ticks: 5F1CBA87 jiffies)

修复过程：因该XBAR多次提示CRC错误，故怀疑为硬件问题，针对该XBAR进行了RMA更换

1/替换步骤
1）	switch(config)# poweroff xbar 1
switch(config)# show mod xbar 
Xbar Ports  Module-Type                         Model              Status
---  -----  ----------------------------------- ------------------ ----------
1    0      Fabric Module 2                     N77-C7706-FAB-2    powered-dn
       2）将Xbar移除，将新的Xbar插入，等待检测
       3）switch(config)# show mod xbar 
Xbar Ports  Module-Type                         Model              Status
---  -----  ----------------------------------- ------------------ ----------
1    0      Fabric Module 2                     N77-C7706-FAB-2    powered-dn
       4）将Xbar上线，switch(config)# no poweroff xbar 1
       5）检查Xbar是否正常工作
switch(config)# show module xbar 
Xbar Ports  Module-Type                         Model              Status
---  -----  ----------------------------------- ------------------ ----------
1    0      Fabric Module 2                     N77-C7706-FAB-2    ok
2/ Xbar支持热插拔
3/通过对log的查看以及故障周期的预测，理论上该问题目前不会对设备的运行造成影响，更换Xbar不会对网络业务造成影响和风险。如我们电话所述，安全起见，建议协调窗口进行Xbar的更换。
4/ switch(config)# show mod xbar  显示Xbar的状态是OK的就可以了。

附：XBAR照片，版主第一次更换，第一次看到N7K XBAR ,下图为刚拆的XBAR

[one-time]

感谢版主分享，谢谢~

[likuo]

借鉴学习。

[likuo]

比较详细。