When using IS-IS, to which multicast address will the peers send their hello packets?

In IS-IS (Intermediate System to Intermediate System), the multicast address used for sending hello packets, which are essential for the establishment of neighbor relationships, is indeed represented by the MAC address 01:80:C2:00:00:14. This specific multicast MAC address is defined for the Link Layer Discovery Protocol (LLDP) and is utilized by IS-IS to identify multicast traffic meant for routing protocol operations.

When IS-IS routers need to dynamically discover neighbors on a network segment, they use this address to send hello packets, ensuring that all IS-IS peers on the local link receive them. The use of a dedicated multicast MAC allows IS-IS to efficiently communicate with multiple neighbors without needing to address each one individually.

The other listed addresses pertain to different protocols or functions within networking. For instance, the address 224.0.0.5 is used by OSPF (Open Shortest Path First) for hello packets, while 224.0.0.6 is used for OSPF designated routers. The notation "49.0001.0224.0000.0015.00" doesn't align with standard multicast operations in the context of IS-IS either. Hence, the correct focus is on