Subject: [mpls] RFC 5331 -- upstream labels

From: Kireeti Kompella <[email-masked]>
Date: Thu, 25 Oct 2012 11:36:09 -0700

While we're on the subject of special purpose labels, could the authors of RFC 5331 comment on whether a reserved (aka special purpose) label can be signaled as an upstream label?  The RFC is silent on the subject, saying only (in Section 5):

   The only requirement on an upstream LSR assigning upstream-assigned
   labels is that an upstream-assigned label must be unambiguous in the
   context-specific label space in which the downstream LSR will look it
   up.  

which seems to imply that a reserved label can be assigned as an upstream label.

Thanks,
Kireeti.