When launching IOL from the CLI it is possible to use the keepalive flag:
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root@eve-ng:/opt/unetlab/addons/iol/bin# LD_LIBRARY_PATH=/opt/unetlab/addons/iol/lib /opt/unetlab/addons/iol/bin/i86bi-linux-l2-adventerprise-15.1b.bin -l 1
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Switch#show ip int br
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES unset down down
Ethernet0/1 unassigned YES unset down down
Ethernet0/2 unassigned YES unset down down
Ethernet0/3 unassigned YES unset down down
Ethernet1/0 unassigned YES unset down down
Ethernet1/1 unassigned YES unset down down
Ethernet1/2 unassigned YES unset down down
Ethernet1/3 unassigned YES unset down down
Serial2/0 unassigned YES unset administratively down down
Serial2/1 unassigned YES unset administratively down down
Serial2/2 unassigned YES unset administratively down down
Serial2/3 unassigned YES unset administratively down down
Serial3/0 unassigned YES unset administratively down down
Serial3/1 unassigned YES unset administratively down down
Serial3/2 unassigned YES unset administratively down down
Serial3/3 unassigned YES unset administratively down down
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root@eve-ng:/opt/unetlab/addons/iol/bin# LD_LIBRARY_PATH=/opt/unetlab/addons/iol/lib /opt/unetlab/addons/iol/bin/i86bi-linux-l2-adventerprise-15.1b.bin 1
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Switch>show ip int br
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES unset up up
Ethernet0/1 unassigned YES unset up up
Ethernet0/2 unassigned YES unset up up
Ethernet0/3 unassigned YES unset up up
Ethernet1/0 unassigned YES unset up up
Ethernet1/1 unassigned YES unset up up
Ethernet1/2 unassigned YES unset up up
Ethernet1/3 unassigned YES unset up up
Serial2/0 unassigned YES unset administratively down down
Serial2/1 unassigned YES unset administratively down down
Serial2/2 unassigned YES unset administratively down down
Serial2/3 unassigned YES unset administratively down down
Serial3/0 unassigned YES unset administratively down down
Serial3/1 unassigned YES unset administratively down down
Serial3/2 unassigned YES unset administratively down down
Serial3/3 unassigned YES unset administratively down down