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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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Recover from Stack Link Flaps

Stack link integrity monitoring enables units to monitor their own stack ports and disable any stack port that flaps five times within 10 seconds.

Dell EMC Networking OS displays console messages for the local and remote members of a flapping link, and on the primary (master) and standby management units as KERN-2-INT messages if the flapping port belongs to either of these units.

In the following example, a stack-port on the master flaps. The remote member, Member 2, displays a console message, and the master and standby display KERN-2-INT messages.

To re-enable the downed stack-port, power cycle the offending unit.

Example of Console Messages About Flapping Link

DellEMC#00:42:46: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 2/54
00:42:48: %S3148P:4 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 4/53
00:42:48: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 2/54
00:42:48: %S3148P:4 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 4/53
00:42:48: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 2/54
00:42:52: %S3148P:4 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 4/53
00:42:52: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 2/54
00:42:53: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 2/54
00:42:53: %S3148P:4 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 4/53
00:42:55: %S3148P:4 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 4/53
00:42:55: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_UP: Changed stack port state to up: 2/54
00:42:56: %S3148P:2 %IFAGT-5-STACK_PORT_LINK_DOWN: Changed stack port state to down: 2/54

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