What a reason to run /sbin/atmconfig diag list in /etc/network.subr?

[Oleg Ginzburg]

Getting the issue when i run a certain number of vnet-epair-jail described in 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194550 I could not 
understand why in /etc/network.subr execute atm-case from afexists() function 
and in particular, why we need to run

/sbin/atmconfig diag list 2>/dev/null 2>&1

Can someone explain what it is used for? 

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