diff --git a/package/czechlight-clearfog-leds/init-leds-sfp.sh b/package/czechlight-clearfog-leds/init-leds-sfp.sh
new file mode 100755
index 0000000..fb904c1
--- /dev/null
+++ b/package/czechlight-clearfog-leds/init-leds-sfp.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+set -ex
+
+for candidate in osc oscW eth2; do
+    if [[ -d "/sys/class/net/${candidate}" ]]; then
+        NETDEV="${candidate}"
+        break
+    fi
+done
+
+if [[ ! -n "${NETDEV+set}" ]]; then
+    echo "Unrecognized SFP device name"
+    exit 1
+fi
+
+# SFP: green lit for "link"
+# SFP: green blinking for activity
+cd /sys/class/leds/sfp:green
+echo netdev > trigger
+echo "${NETDEV}" > device_name
+echo 1 > link
+echo 1 > rx
+echo 1 > tx