Thanks for Replies....

I created a the class like this for shaping the packets with a specified bandwidth rate.....

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 1: htb default 15
tc class add dev eth0 parent 1:0 classid 1:1 htb rate 750kbit ceil 750kbit
tc class add dev eth0 parent 1:1 classid 1:3 htb rate 600kbit ceil 750kbit prio 0

For Our Requirement:-
I dont want to specify the bandwidth rate strictly like this rate750kbit ceil 750kbit,based on whatever speed is coming which should allocate the bandwidth rate for particular class...
I need one application for finding the upcoming bandwidth &
Is any other method is there for specify the bandwidth rate in a classes.,

Saravanan G