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Additional resources for End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs
Likewise, the role of QoS is evolving. Specifically, following the development of advanced hardware policers within the Catalyst switching platforms, such as per-port/per-VLAN policers, dual-rate policers, and user-based microflow policers, new contexts for the use of QoS tools have become possible. These include the use of QoS as a technology not only to enable convergence, but also to increase securityespecially in relation to the exponentially increasing number of DoS and worm attacks experienced by customers since 2000.
150 bps (plus Layer 2 overhead) per phone of guaranteed bandwidth is required for voice control traffic; more may be required, depending on the Call-Signaling protocol(s) in use. Originally, Cisco IP Telephony equipment marked Call-Signaling traffic to DSCP AF31. However, the assured forwarding classes, as defined in RFC 2597, were intended for flows that could be subject to markdown and aggressive dropping of marked-down values. Marking down and aggressively dropping Call-Signaling could result in noticeable delay to dial tone (DDT) and lengthy call-setup times, both of which generally translate into poor user experiences.
Indianapolis: Cisco Press, 2001. Cisco Catalyst QoS: Quality of Service in Campus Networks. Michael Flannagan and Kevin Turek. Indianapolis: Cisco Press, 2003. Cisco DQOS Exam Certification Guide. Wendell Odom, Michael Cavanaugh. Indianapolis: Cisco Press, 2003. com . jsp . com/go/qos . IntServ IntServ is described by a series of RFCs from the IntServ IETF working group. txt . txt . txt . txt . txt . txt . DiffServ DiffServ is described by a series of RFCs from the DiffServ IETF working group. txt .