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A1. CISCO IP-SLA Monitoring Probe Configuration Example Cisco® IP-SLA Probe Command Line Configuration used on JANET Monitoring probes at sites are configured with the Cisco® IOS command: ! tr responder ! This enables the IP-SLA process, allowing the router to receive, process, and return probes back to the CMP. For IOS version 12.4 this command became ‘ip sla monitor responder’ and the related commands changed also.

6.1 Operating System Support for Quality of Service When considering application support for QoS, a key underlying issue will be the level of QoS support in the operating system for packet marking. Earlier sections of this guide have stated that it is preferential to move the packet marking process as close to the source as possible. As such, the ability to do this within the host itself would be the ultimate outcome here. This section will present an overview of QoS support in the major end user operating systems including Microsoft Windows, Linux and UNIX based systems.

In this section we address the deployment of QoS in the Regional Network based on the experience gained by QoS operation and trailing in the project. Due to the range and scope of network infrastructures that operate in this area, it is difficult to present a single case for QoS that fits all cases. Instead, this section will present a discussion of the issues that may be encountered when considering QoS in the Regional Networks and how this can interact with the JANET QoS Policy presented above.

2.1 Introduction to QoS This section provides a brief description of the main techniques concerned with engineering support for QoS in packet networks. A more detailed description of QoS can be found in a companion document [QoSBasics].