UDLD - Uni-Directional Link Detection Feature ICX 7150 ICX 7250 ICX 7450 ICX 7550 ICX 7650 ICX 7850 Unidirectional Link Detection (UDLD) (Link keepalive) 08.0.60 08.0.30 08.0.20 08.0.95 08.0.70 08.0.90 UDLD on tagged ports 08.0.60 08.0.30 08.0.20 08.0.95 08.0.70 08.0.90 Parent topic: Layer 2 Switching