A routing table is a set of rules, often viewed in table format, that is used to determine where data packets traveling over an Internet Protocol (IP) network will be directed. All IP-enabled devices, including routers and switches, use routing tables.
In Multicast Routing the objectives are
- Every member should receive only one copy
- Non members should not receive a copy
- There should be no loops
- The Distance between source and destination should be shortest
All these objectives can be achieved only by creating routing tables
