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Link Aggregation interruption

During the in-service software upgrade, LACP PDUs are not generated or received for about 15 seconds on Ethernet ports configured with LACP,

This interruption has no effect on the local side of the link because JUNOSe software generates LAC PDU packets every 30 seconds. The link is not declared down unless packets are missed three times. LACP packet generation continues when the unified ISSU operation is completed.

If a device on the other end of the link is configured with the short timeout of one second, then the device is likely to declare the link to be down and remove the link from the LAG bundle.

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