This technique reduces the CIR in response to backwards explicit congestion notification (BECN) messages from the service provider. Because traffic is being transmitted at the CIR in the first place, it does not need to be throttled.
Set cir and mincir to the negotiated CIR.
If FRF.12 fragmentation is implemented, reduce the cir and mincir values to account for the fragment headers.
Set be, the excess burst rate, to 0.
Set bc, the committed burst rate, to cir/100.
This accounts for a serialization delay of maximum 10 ms .
Apply this map class to an interface, subinterface, or VC.
Example
The complete configuration for Frame Relay traffic shaping looks like the following:
map-class frame-relay
NoBurst no frame-relay adaptive shaping
frame-relay cir 384000! (for a 384K CIR)
frame-relay mincir 384000
frame-relay be 0
frame-relay bc 3840
interface serial 0
frame-relay class NoBurst
