+/**\r
+ A dedicated timer is used to poll underlying media status. In case of\r
+ cable swap, a new round auto configuration will be initiated. The timer \r
+ will signal the IP4 to run the auto configuration again. IP4 driver will free\r
+ old IP address related resource, such as route table and Interface, then\r
+ initiate a DHCP round by IP4Config->Start to acquire new IP, eventually\r
+ create route table for new IP address.\r
+\r
+ @param[in] Event The IP4 service instance's heart beat timer.\r
+ @param[in] Context The IP4 service instance.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+MediaChangeDetect (\r
+ IN EFI_EVENT Event,\r
+ IN VOID *Context\r
+ );\r
+\r