What is meant by connection state information in virtual circuit network? If in a switch in VC network, connections are established and from down at a rate of one connection per millisecond (on...

What is meant by connection state information in virtual circuit network? If in a switch in VC  network, connections are established and from down at a rate of one connection per millisecond (on average), at what rate dose the forwarding table in the switch need to be modified?