CAR is a QoS mechanism that also lends itself to use in security implementations. CAR's primary function is to control the amount of traffic flowing through an interface based on various configured parameters. CAR can perform two basic functions: Bandwidth management Traffic classification for use by other QoS mechanisms This chapter concentrates on CAR's first function—bandwidth management on a router. CAR uses rate limit definitions to control the traffic flowing thro..
Area Design of Integrated IS-IS Routers
When designing a network, you have to compromise. Typically, the trade-off is between reliability and speed. What is most efficient for the network is determined by the requirements of the network and the resources available. In designing Integrated IS-IS networks and the hierarchical design, you need to consider the data flow in addition to the resources required by the routing protocol. Tuning the update process might be sufficient, although this results in compromis..
The purpose of the default route in any routing protocol is to forward traffic to destinations that are not in the router's routing table. It is not possible for all the routers in a network to have full Internet routes. For this purpose, routers without full routes to all the destinations forward traffic to the default originating router. Level 1 routers never maintain information about any destination that is outside their area, so all level 1 routers merely s..
Recall that link-state protocols are based on neighbor relationships, so every router within an area knows about all the active links within its area and knows the identity of router-originating information about these active links. Every router advertises the cost and state of its links. This state information is then propagated one hop away. This propagation of information results in all routers having identical databases. Every router is identified by its uni..
Currently Recommended Layer 3 Queuing Mechanisms
Each of the previously described Layer 3 queuing tools had serious shortcomings in handling the traffic mix required by converged networks. Either they handled data fairly well or could prioritize real-time applications, such as voice. But none of these tools was capable of handling both types of traffic efficiently. Therefore, enhanced algorithms were developed to leverage the strengths of each type of legacy algorithm and, at the same time, to minimize their weaknesses. Th..
