Comprehensive and Detailed In-Depth Explanation:
* Multicast MAC addresses follow the format 01-00-5E-XX-XX-XX, derived from the IPv4 multicast address (224.0.0.0 - 239.255.255.255).
* The lower 23 bits of the IPv4 multicast address are mapped to the MAC address, causing ambiguity because different IPv4 multicast addresses can share the same MAC address.
* The IPv4 multicast range (224.0.0.0 - 239.255.255.255) is divided as follows:# 224.0.0.0 -
224.0.0.255: Local Network Control Block (e.g., 224.0.0.1)# 224.0.1.0 - 238.255.255.255: Global and Reserved Multicast (e.g., 224.0.1.1, 225.0.1.1)# 239.0.0.0 - 239.255.255.255: Private Multicast (Not mapped to 01-00-5E)
* The MAC 01-00-5e-00-01-01 corresponds to an IPv4 multicast address in the range 224.0.0.0 -
238.255.255.255, but not to 239.128.1.1, because addresses in the 239.x.x.x range are private multicast addresses.
# Reference: HCIP-Datacom Advanced Routing & Switching Technology - Multicast MAC Address Mapping