Role of Addresses
Address structure required for scalability
- Why ? Routing table sizes, control traffic etc depends upon the number of nodes in the network.
- By capturing an entire sub-network as a “virtual node”, you can reduce the number of “virtual nodes” core routers see.
- Need hierarchical addressing, and address allocation according to topology for this.
Telephony and ATM networks use variable sized, large (upto 20 bytes) addresses.
- The large address is only carried during signaling