CISCO 4503 not able to connect to 3COM 4900 at physical layer.
Hi,I hve at the core a CISCO 4503 and need to connect various 3COM 3300/4400/4900 access switches thru fibre. The problem is tht the cisco core 4503 switch fails to recgonise only the 4900 3com switches ie the link status shows down. The fibre multim...