文档介绍：DESIGN GUIDE
Designing ATM works
Version . Cisco Internal Use Only.
Jeremy Lawrence, Multiservice Switching Business Unit
Note on Versions
This document is for Cisco Internal Use Only. An shorter Cisco Confidential version with some sensitive content removed is (or will
soon be) available from “IP+ATM Solutions” page at .com//cisco/mkt/wan/ipatm/. The Cisco
Confidential version (but not this version) may be released to Service Provider customers under a Non-Disclosure Agreement.
Outline
Multiprotocol Label Switching (MPLS) extends the capabilities of IP routers and ATM Switches in several key ways:
• It fully integrates IP Routing control with ATM switches, providing native support of IP services such as IP Class of Service and
IP Multicast on ATM switches as well as routers.
• It provides support for scalable and flexible IP Virtual work (VPN) services on both switches and routers.
• It provides support for IP Traffic Engineering, which is the fine-grained adjustment of IP traffic flows according to the resources
in work.
This version of Designing ATM works concentrates on the fundamentals of ATM work design. These
fundamentals apply to all ATM works, irrespective of the services being offered on them:
• Choosing MPLS equipment
• IP+ATM concepts and equipment
• Designing and dimensioning ATM MPLS points of presence
• Dimensioning work links
• IP routing in ATM works
• Dimensioning MPLS Label VC requirements
• work design
• Migrating works to MPLS
Open Issues
ments & Errata
• : In Figure 4c it's not clear that the data flow is CPE -- MGX -- eLSR -- MPLS cloud. A revised version of the diagram would
make this clearer.
• : The equations are either correct or “safe” over-estimates. However some slightly tighter limits apply to the edge LSRs in
networks with switches which use unpaired cross-connects, namely the LS1010, 6400 and 8540 MSR. These should be mentioned.
Designing ATM works
Cisco Internal U