This post is a partial excerpt from the QoS section of our IEWB-RS VOL1 V5. We'll skip the discussion of how much of a legacy the Custom Queue is, and get stright to the working details. Custom queue feature is similar to WFQ in that it tries to share the bandwidth between packet flows using the max min approach: each flow class gets the guaranteed share proportional to its weight plus any class may claim the “unused” interface bandwidth. However, unlike WFQ, there are no dynamic conversations,... Read More
The subject is a legacy and is no longer a big issue for the CCIE SP exam. However, it still worths mentioning few major features of cell-mode ATM. For our article we'll conside a small network consisting of three routers: Read More
Generally, flow-control is a mechanics allowing the receiving party of a connection to control the rate of the sending party. You may see many different implementations of flow-control technologies at different levels of OSI model (e.g. XON/XOFF for RS232, TCP sliding window, B2B credits for Fibre Channel, FECN/BECN for Frame-Relay, ICMP source-quench message, etc). Flow-Control allows for explicit feedback loop and theoretically implementing loss-less networks that avoid congestion. For the... Read More
This is the most well-known FRTS method, which has been available for quite a while on Cisco routers. It is now being outdated by MQC configurations. The key characteristic is that all settings are configured under map-class command mode, and later are applied to a particular set PVCs. The same configuration concept was used for legacy ATM configuration mode (map-class atm). Read More
As first and very basic option, you may use Generic Traffic Shaping to implement FRTS. This is a common technique, not unique to Frame-Relay, with the following properties: Read More
Commonly people run into issues with the ip default-network command putting static routes in their configuration when they select a network that can not be considered as the candidate default network. I'll show the two common mistakes with this command that causes this to happen. Read More

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