Hi All,
Due to redundancy I have 4 switches SG550XG/X in hybrid stacking mode.
Ring topology:
Unit 1(Master): SG550X-24
Unit 2(Backup): SG550X-24
Unit 3(Slave): SG550XG-8F8T
Unit 4(Slave): SG550XG-8F8T
What exactly happens:
1) Unit 2 loses connection and reboot
2) Then Unit 3 and Unit 4 lose connection and reboot
3) Only master is up
4) Last 4 months without configuration changes
Cisco550XG#show version
Active-image: flash://system/images/image_tesla_hybrid_2.5.0.78_release_cisco_signed.bin
Version: 2.5.0.78
MD5 Digest: 1a3d018adc073322e051cd6683b50ee9
Date: 15-Apr-2019
Time: 17:21:11
Inactive-image: flash://system/images/image1.bin
Version: 2.4.0.91
MD5 Digest: 3d016227f4b3f7932ea0ea5d2f7846a1
Date: 17-Apr-2018
Time: 21:24:33
LOGS:
2147482038 2020-Oct-28 05:48:59 Warning %TRUNK-W-PORTREMOVED: Port gi2/0/4 removed from Po4
2147482039 2020-Oct-28 05:48:59 Warning %TRUNK-W-PORTREMOVED: Port gi2/0/3 removed from Po3
2147482040 2020-Oct-28 05:48:58 Warning %TRUNK-W-PORTREMOVED: Port gi2/0/1 removed from Po1
2147482041 2020-Oct-28 05:48:48 Warning %STP-W-PORTSTATUS: gi1/0/23: STP status Forwarding
2147482042 2020-Oct-28 05:48:48 Error %Stack-E-STCK-EXCEP-HNDLR: Lost connection with unit 4 reason : connection timeout. Unit will be rebooted .
2147482043 2020-Oct-28 05:48:48 Warning %MLDP-W-ABORT: Connection to Unit 4 is aborted due to Timeout.
2147482044 2020-Oct-28 05:48:46 Warning %STP-W-PORTSTATUS: gi1/0/23: STP status Blocking
2147482045 2020-Oct-28 05:48:45 Warning %CSCDLAG-W-CFG-CHNG: Configuration changed: Ring to Chain
2147482046 2020-Oct-28 05:48:45 Warning %CSCDLAG-W-DOWN: Stack port te3 operational status is Down
2147482047 2020-Oct-28 05:48:36 Error %Stack-E-STCK-EXCEP-HNDLR: Lost connection with unit 3 reason : connection timeout. Unit will be rebooted .
2147482048 2020-Oct-28 05:48:36 Warning %MLDP-W-ABORT: Connection to Unit 3 is aborted due to Timeout.
2147482049 2020-Oct-28 05:48:36 Warning %TRUNK-W-PORTREMOVED: Port gi2/0/5 removed from Po5
2147482050 2020-Oct-28 05:48:36 Warning %TRUNK-W-PORTREMOVED: Port gi2/0/2 removed from Po2
2147482051 2020-Oct-28 05:48:36 Error %Stack-E-STCK-EXCEP-HNDLR: Lost connection with unit 2 reason : connection timeout. Unit will be rebooted .
2147482052 2020-Oct-28 05:48:36 Warning %MLDP-W-ABORT: Connection to Unit 2 is aborted due to Timeout.
2147482053 2020-Oct-28 05:48:01 Warning %STP-W-PORTSTATUS: te4/0/4: STP status Forwarding
2147482054 2020-Oct-28 05:47:56 Informational %LINK-I-Up: te4/0/4
2147482055 2020-Oct-28 05:47:50 Warning %LINK-W-Down: te4/0/4
2147482056 2020-Oct-28 05:45:39 Warning %STP-W-PORTSTATUS: te4/0/4: STP status Forwarding
2147482057 2020-Oct-28 05:45:34 Informational %LINK-I-Up: te4/0/4
2147482058 2020-Oct-28 05:45:34 Warning %STP-W-PORTSTATUS: te3/0/4: STP status Forwarding
2147482059 2020-Oct-28 05:45:30 Informational %LINK-I-Up: te3/0/4
2147482060 2020-Oct-28 05:45:28 Warning %LINK-W-Down: te4/0/4
2147482061 2020-Oct-28 05:45:23 Warning %LINK-W-Down: te3/0/4
In the last 7 days, the second restart of the stack(restart Unit2 and then Unit3-4).
Thanks for help
Thanks and best regards
Juraj Kramár
