Advertising Global Labels Using IGP

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Last updated 2014-01-12 (latest revision 2013-07-11)
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Segment Routing (SR) [SR-ARCH] is a new MPLS paradigm in which each SR-capable router is required to independently advertise global MPLS labels for its attached prefixes using IGP [SR-ISIS-EXT][SR-OSPF-EXT]. One major challenge associated with such label advertisement mechanism is how to avoid a given global MPLS label from being allocated by different routers to different prefixes. Although manual allocation can address such label allocation collision problem, it is error-prone and therefore may not be suitable for large SR network environments. This document proposes an alternative approach for advertising global labels without any risk of label allocation collision.


Xiaohu Xu (
Mach Chen (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)