查看完整版本: RFC5129-Explicit Congestion Marking in MPLS

RFC5129-Explicit Congestion Marking in MPLS

【资料成文时间】： 2007
【语言】：英文
【页数】：21
【何人（公司）所著】：
【文件格式】： PDF
【文件原名】：Explicit Congestion Marking in MPLS
【摘要或目录】：
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Background . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Intent . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Use of MPLS EXP Field for ECN . . . . . . . . . . . . . . . . 5
3. Per-Domain ECT Checking . . . . . . . . . . . . . . . . . . . 7
4. ECN-Enabled MPLS Domain . . . . . . . . . . . . . . . . . . . 8
4.1. Pushing (Adding) One or More Labels to an IP Packet . . . 8
4.2. Pushing One or More Labels onto an MPLS Labeled Packet . . 8
4.3. Congestion Experienced in an Interior MPLS Node . . . . . 8
4.4. Crossing a Diffserv Domain Boundary . . . . . . . . . . . 8
4.5. Popping an MPLS Label (Not the End of the Stack) . . . . . 9
4.6. Popping the Last MPLS Label in the Stack . . . . . . . . . 9
4.7. Diffserv Tunneling Models . . . . . . . . . . . . . . . . 10
5. ECN-Disabled MPLS Domain . . . . . . . . . . . . . . . . . . . 10
6. The Use of More Codepoints with E-LSPs and L-LSPs . . . . . . 10
7. Relationship to Tunnel Behavior in RFC 3168 . . . . . . . . . 11
8. Deployment Considerations . . . . . . . . . . . . . . . . . . 11
8.1. Marking Non-ECN-Capable Packets . . . . . . . . . . . . . 11
8.2. Non-ECN-Capable Routers in an MPLS Domain . . . . . . . . 12
9. Example Uses . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. RFC 3168-Style ECN . . . . . . . . . . . . . . . . . . . . 13
9.2. ECN Co-Existence with Diffserv E-LSPs . . . . . . . . . . 13
9.3. Congestion-Feedback-Based Traffic Engineering . . . . . . 14
9.4. PCN Flow Admission Control and Flow Termination . . . . . 14
10. Security Considerations . . . . . . . . . . . . . . . . . . . 14
11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15
Appendix A. Extension to Pre-Congestion Notification . . . . . . 16
A.1. Label Push onto IP Packet . . . . . . . . . . . . . . . . . 16
A.2. Pushing Additional MPLS Labels . . . . . . . . . . . . . . 16
A.3. Admission Control or Flow Termination Marking Inside
MPLS Domain . . . . . . . . . . . . . . . . . . . . . . . . 17
A.4. Popping an MPLS Label (Not End of Stack) . . . . . . . . . 17
A.5. Popping the Last MPLS Label to Expose IP Header . . . . . . 17
Normative References . . . . . . . . . . . . . . . . . . . . . . . 18
Informative References . . . . . . . . . . . . . . . . . . . . . . 18