flows use datalink IDs in persistent configuration
The /etc/dladm/flowadm.conf configuration for flows stores the datalink over which flows are configured using a datalink ID. For example:
1_sns linkid=2 transport=6 local_port=21001
Datalink IDs themselves are not persistent. A given datalink may be assigned a different ID each time the system is booted. As such, persistent flows could accidentally migrate to unexpected links when the system reboots, or end up disappearing if the datalink ID happens to be unused.
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