[Bug 230040] [lagg] [cxgbe] [vlan] no carrier on one laggport after boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230040

            Bug ID: 230040
           Summary: [lagg] [cxgbe] [vlan] no carrier on one laggport after
                    boot
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: dd at goboomtown.com

After upgrading from 11.1-RELEASE-p11, I have an issue where after booting the
first laggport (cxl0) is UP but shows "no carrier".  In this state, the lagg0
interface shows that port as inactive (e.g. not active/collecting/distributing)
and my switch 'show port etherchannel' output agrees that the laggport is in
fact not active.

Here is the configuration which works as expected on 11.1-RELEASE-p11:

cloned_interfaces="lagg0"
ifconfig_cxl0="up media 10Gbase-T mediaopt full-duplex rxcsum txcsum"
ifconfig_cxl1="up media 10Gbase-T mediaopt full-duplex rxcsum txcsum"
ifconfig_lagg0="up laggproto lacp laggport cxl0 laggport cxl1 lagghash l2,l3
lacp_fast_timeout"
vlans_lagg0="6"
ifconfig_lagg0_6="inet 172.27.1.1/26 mtu 1500"

This is a mature configuration in a tightly controlled production environment. 
It has not been changed in a long time, and was not changed during the upgrade.

Consistency/Reproducibility:

I have 5 servers in my production facility which use this config (e.g. cxgbe +
lagg + vlan).  All of the machines worked as expected before the upgrade.  And
all of the machines exhibit this behavior after the upgrade.

Workaround:

I am able to fully correct the condition by issuing the following command:

# ifconfig cxl0 down && sleep 2 && ifconfig cxl0 up

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