Posts from ‘WAN Links’


This blog post is taken from the INE Resources area Understanding Frame-Relay Traffic Shaping presentation by Brian Dennis.


Frame-Relay traffic shaping is designed to control the amount of traffic the router sends out of an interface or out of a particular DLCI. Common reasons for Frame-Relay traffic shaping are:

  • It allows the router to conform to the rate subscribed with the service provider
  • It allows for the throttling of a higher speed site (768K) so that it does not overrun a lower speed site (64K)

Traffic shaping is designed to delay excess traffic, whereas policing is designed to drop excess traffic.


  • Available Rate (AR) – the actual physical speed of the interface; on a DCE serial interface this is determined by the configured clock rate. On a DTE serial interface, it is determined by the received clock rate. A router will always (by default) try to send out at the AR regardless of the interface bandwidth. AR is also commonly referred to as port speed, line rate, or access rate.

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Two new Hands On Labs are being added to the course this weekend. Enjoy!

  • Configuring a Back-to-Back Serial WAN Connection
  • Configuring a Back-to-Back PPP WAN Connection

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We are adding practices for common commands you need to know to the CCENT course. We uploaded an updated Verifying the WAN Connection lesson tonight. Want to experience a sample practice right now? Use the link below. Happy studies!

Verifying the WAN Connection

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In this post, we will examine the steps required to ensure full reachability over a Serial interface between two Cisco routers. Here is the network diagram that presents the topology used in this scenario:

Network Diagram

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