The MPLS-OPS Archive

[Rohit Mediratta <rohit_medi@yahoo.com>]

Hi, 

Attached is a paragraph from "Fast reroute Extensions
to RSVP-TE for LSP Tunnels" Sec 6.3

- The PLR MUST generate an EXPLICIT_ROUTE object
toward the egress.First, the PLR must remove all
sub-objects preceding the first address belonging to
the Merge Point.  Then the PLR SHOULD add sub-objects
corresponding to the desired backup path between the 
PLR and the MP.

 I have this setup

   A---B---C---D--G
       |       |
       E-------F

If i have a Fast reroute LSP setup between Router A
and Router G with
every interface on the primary path explicitly defined
in the hop list. The PLR (Router B) would signal a
Detour path to Router D via E and F. 
It seems to me from the paragraph attached above, that
Router B should not remove the sub-object for the
interface on Router D towards C. As that interface
shall be "belonging to the merge point".

However if we do that the ERO for the detour PATH will
have the following ERO
interface B-E
interface E-F
interface F-D
interface D-C  <----
interface D-G

This will never be setup.

Am i interpreting the draft incorrectly ?

thanks,
rohit


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