Lab 8.4.8: Frame Relay Traffic Shaping - Dynamic Enforcement

Objectives:

  • Configure dynamic rate enforcement on your Frame Relay network that will adapt itself automatically to the BECNs that are received from the Frame Relay network.

Scenario:

Your main office in Atlanta has a high-speed T1 Frame Relay connection. There is a bottleneck that exists at the other end of the PVC that connects to Orlando. This is due to the fact that Orlando only has a 56K Frame Relay connection.

Install dynamic rate enforcement that will automatically adapt itself based on BECNs that are received from the network.

Notes: 

Lab Tasks:

  1. Cable the lab as shown in the diagram. Use the Adtran Atlas 550 to simulate the Frame Relay network. Start with a clean config on both routers.
  2. Configure IP addresses on the Ethernet interfaces.
  3. Configure IGRP on all routers. Use AS# 100.
  4. Configure the serial interfaces that connect to the Frame Relay network for Frame Relay encapsulation and set the LMI type to ANSI.

    Use sub-interfaces on the router in Atlanta.

    Use the DLCI number of each PVC as your sub-interface number.

    Configure IP addresses, check your routing tables, and verify connectivity.

  5. Create Frame Relay map class for the Orlando site. Set the class to perform adaptive shaping based on BECN messages.
  • On the Atlanta router:

Atlanta(config)#map-class frame-relay becnnotify
Atlanta(config-map-class)#frame-relay adaptive-shaping becn

  1. Enable traffic shaping on the main serial interface. Note: the frame-relay traffic-shaping command must be issued on the interface itself, not the sub-interface.
  • On the Atlanta router:

Atlanta(config)#int s0/0
Atlanta(config-if)#frame-relay traffic-shaping

  1. Now apply the map-class to the sub-interface:
  • On the Atlanta router:

Atlanta(config)#int s0/0.17
Atlanta(config-subif)#frame-relay class becnnotify

  1. What command can be used to verify traffic shaping is turned on? (Hint: you must specify the DLCI number to see traffic shaping information.)


  2. How can we tell that the traffic shaping is adapting to the BECN messages?