Jun
14
In this short blog post, we are going to give condensed overview of the four main flavors of Frame-Relay Traffic Shaping (FRTS). Historically, as IOS evolved with time, different methods have been introduced, having various level of feature support. Two main features, specific to Frame-Relay Traffic-Shaping are per-VC shaping and queueing and adaptive shaping in response to Frame-Rleay congestion notifications (e.g. BECNs). You'll see that not every flavor supports these two features. We begin... Read More
Mar
23
This blog post is taken from the INE Resources area Understanding Frame-Relay Traffic Shaping presentation by Brian Dennis. Overview 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... Read More
Mar
02
You just cannot assume anything when you sit for your Version 4.0 CCIE R&S Lab Exam. One of the former assumptions we could make with Version 3.x was that our Frame Relay Switch is going to be just fine and dandy. Therefore, if you examined your PVC health (status) and you saw DELETED, you could immediately inspect your Frame Relay map statements, or your frame-relay interface-dlci commands for a typo in the DLCI. But in this new exam (Troubleshooting section or Configuration section), nothing... Read More
Dec
03
Following along the idea of pinging yourself (depending on where you live, there may actually be laws against that!), there are some further problems if we happen to be running PPP over Frame-Relay.   So let's start with some basic Frame-Relay configuration and move up from there. R3 int s1/0 encap frame no shut R5 int s0/0/0 encap frame no shut INE-R3(config-if)#do sh frame pvc | in ACT DLCI = 301, DLCI USAGE = UNUSED, PVC STATUS = INACTIVE, INTERFACE = Serial1/0 DLCI = 302, DLCI USAGE =... Read More
Dec
02
You might have a request in the Core Knowledge, Troubleshooting, or the Configuration section to have a Cisco router be able to PING its own Frame-Relay IP address. In this blog post, we will make sure we can accomplish this. Here is the topology that we will use: Read More
Dec
01
Sample Trouble Ticket Your junior administrator has reported that R1 and R3 are unable to establish their EIGRP adjacency. The first thing I want to do is engage in some "ground up" troubleshooting here. How are Layers 1 and 2 starting at R1? R1#show ip int brief Interface                  IP-Address      OK? Method Status                Protocol FastEthernet0/0            unassigned      YES unset  administratively down down Serial0/0                  178.10.0.1      YES manual... Read More
Aug
26
Note: The following post is an excerpt from the full QoS section of IEWB-RS VOL1 version 5. Peak shaping may look confusing at first sight; however, its function becomes clear once you think of oversubscription. As we discussed before, oversubscription means selling customers more bandwidth than a network can supply, hoping that not all connections would use their maximum sending rate at the same time. With oversubscription, traffic contract usually specifies three parameters: PIR, CIR and Tc –... Read More
Aug
14
Can you please help me understand use of Frame-Relay Interface-dlci command. It’s getting mysterious for me day by day as I am studying FR. The reason being is I earlier thought that I should only use this command on FR point to point subinterface. As Point to Point subinterface don’t allow us to put Frame relay map statements. Also in such case Inverse arp should be turned off. But while I was going through Cisco’s FR documentation on website I saw that in almost all examples they used... Read More
Aug
04
More updates have been posted tonight to the CCIE Routing & Switching Lab Workbook Volume 1 Version 5.0 Beta on the member’s site. Bridging & Switching, Frame Relay, IP Routing, RIP, and EIGRP are now posted. Also there is a new feature that indicates when the files were updated last, so you will always know if you have the most current version. Read More
Jun
29
Hi Brian, Read More

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