By Srinivas Raju Vegesna
This layout advisor, for someone making plans to install caliber of carrier (QoS) in Cisco networks, offers entire assurance of Cisco IP QoS good points and services and provides case reviews and configuration examples. Emphasis is on real-world functions. Chapters are in sections on IP QoS, internetworking with IP QoS, and site visitors engineering. Appendices conceal the Cisco modular QoS command-line interface, packet switching mechanisms, routing guidelines, RTP, and link-layer fragmentation and interleaving. fabric is written for internetworking execs who're chargeable for designing and preserving IP companies for company intranets and for merchant community infrastructures
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Additional resources for IP Quality of Service
In Step 1, shown in Figure 4-2, the demands of Users A and B are fully allocated because their resource requests fall within the fair allocation. 8 and, hence, cannot be allocated. In the next step, the unused excess bandwidth of A and B's fair allocation is equally distributed among the three remaining users, C, D, and E. Figure 4-2 Resource Allocation for Users A and B Figure 4-3 Resource Allocation forUser C 54 Figure 4-4 Resource Allocation forUsers D and E In Step 2, shown in Figure 4-3, the demand of User C is fully allocated because its resource request falls within the fair allocation.
All protocols. IP only. Protocol Support Case Study 3-10: Shaping Traffic to the Access Rate An enterprise connects to a service provider's network at a 256 Kbps access rate using a T1. The enterprise's network administrator wants to constrain the amount of data going over the T1 link to 256 Kbps on average, as in Figure 3-11. 44 Figure 3-11 Traffic Shaping to an Access Rate of 256K The serial interface of the enterprise's router that connects to the service provider has an access rate of 256 Kbps.
So it is possible to classify users in the order of their increasing demand for a resource. The max-min fair-share allocation is defined as follows: • • • Resources are allocated in order of increasing demand. No user gets a resource share larger than its demand. Users with unsatisfied demands get an equal share of the resource. Consider an example in which a resource has a capacity of 14, servicing five users, A, B, C, D, and E, with demands 2, 2, 3, 5, and 6, respectively. Initially, the source with the smallest demand is given a resource equal to the resource capacity divided by the total number of users.