Реферат: Cisco Tag Switching Essay Research Paper Abstract
Large, enterprise backbones immediately benefit from the increased capacity and traffic management provided by Tag switching. Enterprises can also exploit Tag switching for their networks or backbones to: 7
Provide advanced QoS features that ensure network priority for mission-critical traffic.
Seamlessly integrate voice and data networks under one high-speed infrastructure.
Extend Tag-enabled ISP network services to the corporate enterprise.
Provide a more cost-effective environment by optimally using WAN bandwidth.
Scale existing enterprise backbone infrastructures to meet future requirements.
Conclusion
Of the currently proposed multilayer switching technologies, Tag Switching provides the most robust solution along with the best match with the requirements for multilayer switching. The Tag Switching topology-driven approach, which couples its control-driven destination prefix algorithm to standard routing protocols, supports much more efficient use of labels than traffic-driven per flow designs, and avoids flow-by-flow setup procedures.
One of the key innovations brought to the table by Tag Switching is the use of hierarchy of tags (e.g. Tag stacks). This enables enhancements to routing scalability by allowing FEC’ s to form a hierarchy that reflects the hierarchy in the underlying routing system.
Tag Switching also provides direct support for advanced IP services, such as CoS, RSVP, IP, VPNs, and multicast on ATM switches. This technology also brings the benefits of explicit routing and VPNs to gigabit routers. Most importantly, Cisco’ s implementation of Tag Switching is a close fit and will conform to the Multi-protocol Label Switching (MPLS) standard, both for external interfaces and for interfaces within the core of the network, enabling multi-vendor networks.
The inherent flexibility of Tag Switching also provides an outstanding match with the evolutionary requirements of public and private IP networks. Tag switching is designed from the ground up to support both packet and cell interfaces. Flexible, durable (for now) and influencing the IETF with Tag technology for the MPLS standard.
Simply stated, I believe Tag Switching, a.k.a. future name MPLS, is a viable technology able to meet the requirements brought up in the beginning of this document. Tag Switching brings layer 2 and Layer 3 functionality together with increased performance is, for right now, the best in class.
References
[1] Christopher Y. Metz , “IP Switching : Protocols and Architectures,” McGraw Hill 1999,
Chapter 11, PP. 279-307
[2] Y. Rekhter, B. Davie, D. Katz, E. Rosen, G. Swallow, et al., “Cisco Systems’ Tag Switching
Architecture Overview,” RFC 2105, February 1997.
[3] Cisco Tag Switching: Data Sheets; for further information see
http://www.cisco.com/warp/public/cc/cisco/mkt/wan/mgx8800/prodlit/tagsi_ds.htm
[4] Cisco White Paper; Tag Switching: Uniting Routing and Switching for Scalable, High-Performance
Services; see http//www.cisco.com/warp/public/cc/cisco/mkt/ios/tag/tech/tagsw_wp.htm
[5] A. Detriech,…et al., “MPLS and Cisco Tag Switching,” Proc. Cisco Networkers Conference, July
2000
[6] Bruce Davie, Yakov Rekhter, “MPLS: Technology and Applications,” Morgan Kaufman 2000,
Chapter 4, PP. 87-120
[7] Cisco IOS Software; Tag Switching:, Tag Switching: Evolving Your Network,
see http//www.cisco.com/warp/public/732/Tech/tag/overview.html
[8] Cisco On-line Documentation Paper; Tag Switching: Uniting Routing and Switching for Scalable,
High-Performance Services;