Hello,

I am currently experimenting with OpenBGPD uing OpenBSD VMs on
VirtualBox.

I've noticed that, given interface em1 to which I've assigned address
192.168.1.1/24, if I either execute 'ifconfig em1 down' or virtually
unplug em1 from VirtualBox the following happens:

1. The 192.168.1.0/24 route remains visible in 'netstat -rvn', albeit
   *without* the 'U' flag.
2. OpenBGPD does *not* send an update to its peer that 192.168.1.0/24 is
   no longer reachable.

I interpret this to mean that on a bare metal server, even if I
physically unplugged the Ethernet cable from em1, OpenBGPD would still
advertise reachability to 192.168.1.0/24; is my assumption correct? If
so, what can I do to make sure that OpenBGPD would stop advertising any
directly-connected subnet whose Ethernet connection has experienced some
kind of fault?

Thanks,
-Martin

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