Network Working Group K. Kompella, Ed.
Request for Comments: 4202 Y. Rekhter, Ed.
Category: Standards Track Juniper Networks
October 2005
Routing Extensions in Support of
Generalized Multi-Protocol Label Switching (GMPLS)
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document specifies routing extensions in support of carrying
link state information for Generalized Multi-Protocol Label Switching
(GMPLS). This document enhances the routing extensions required to
support MPLS Traffic Engineering (TE).
Kompella & Rekhter Standards Track [Page 1]
RFC 4202 Routing Extensions for GMPLS October 2005
Table of Contents
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements for Layer-Specific TE Attributes . . . . . 4
1.2. Excluding Data Traffic from Control Channels. . . . . . 6
2. GMPLS Routing Enhancements. . . . . . . . . . . . . . . . . . 7
2.1. Support for Unnumbered Links. . . . . . . . . . . . . . 7
2.2. Link Protection Type. . . . . . . . . . . . . . . . . . 7
2.3. Shared Risk Link Group Information. . . . . . . . . . . 9
2.4. Interface Switching Capability Descriptor . . . . . . . 9
2.4.1. Layer-2 Switch Capable. . . . . . . . . . . . . 11
2.4.2. Packet-Switch Capable . . . . . . . . . . . . . 11
2.4.3. Time-Division Multiplex Capable . . . . . . . . 12
2.4.4. Lambda-Switch Capable . . . . . . . . . . . . . 13
2.4.5. Fiber-Switch Capable. . . . . . . . . . . . . . 13
2.4.6. Multiple Switching Capabilities per Interface . 13
2.4.7. Interface Switching Capabilities and Labels . . 14
2.4.8. Other Issues. . . . . . . . . . . . . . . . . . 14
2.5. Bandwidth Encoding. . . . . . . . . . . . . . . . . . . 15
3. Examples of Interface Switching Capability Descriptor . . . . 15
3.1. STM-16 POS Interface on a LSR . . . . . . . . . . . . . 15
3.2. GigE Packet Interface on a LSR. . . . . . . . . . . . . 15
3.3. STM-64 SDH Interface on a Digital Cross Connect with
Standard SDH. . . . . . . . . . . . . . . . . . . . . . 15
3.4. STM-64 SDH Interface on a Digital Cross Connect with
Two Types of SDH Multiplexing Hierarchy Supported . . . 16
3.5. Interface on an Opaque OXC (SDH Framed) with Support
for One Lambda per Port/Interface . . . . . . . . . . . 16
3.6. Interface on a Transparent OXC (PXC) with External
DWDM that understands SDH framing . . . . . . . . . . . 17
3.7. Interface on a Transparent OXC (PXC) with External
DWDM That Is Transparent to Bit-Rate and Framing. . . . 17
3.8. Interface on a PXC with No External DWDM. . . . . . . . 18
3.9. Interface on a OXC with Internal DWDM That Understands
SDH Framing . . . . . . . . . . . . . . . . . . . . . . 18
3.10. Interface on a OXC with Internal DWDM That Is
Transparent to Bit-Rate and Framing . . . . . . . . . . 19
4. Example of Interfaces That Support Multiple Switching
Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1. Interface on a PXC+TDM Device with External DWDM. . . . 20
4.2. Interface on an Opaque OXC+TDM Device with External
DWDM. . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3. Interface on a PXC+LSR Device with External DWDM. . . . 21
4.4. Interface on a TDM+LSR Device . . . . . . . . . . . . . 21
5. Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . 22
6. Security Considerations . . . . . . . . . . . . . . . . . . . 22
Kompella & Rekhter Standards Track [Page 2]
RFC 4202 Routing Extensions for GMPLS October 2005
7. References. . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.1. Normative References. . . . . . . . . . . . . . . . . . 23
7.2. Informative References. . . . . . . . . . . . . . . . . 24
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