The MPLS WG Archive

[np rpr <np_rpr@yahoo.com>]

Hi Jean,

I have question about Hello messages in RSVP-TE(RFC
3209). When exactly should the hello message be
registered to timer. My thoughts: when RESVP is
received on a node(LSR) and which confirms the success
in creating the label.If this the right way then how
this will be dealed at egress as it(egress) issues the
first RESV and doesn't receieve as opposite to another
nodes. 

Please advice me.

Thanks,
Nitin 

 
How 
--- Jean Philippe Vasseur <jvasseur@cisco.com> wrote:
> Hi,
> 
> New draft recently posted:
> draft-vasseur-mpls-linknode-failure-00.txt. Any 
> comment is very welcome.
> 
> Abstract
> 
> The aim of this draft is to provide a method to
> distinguish a link from
> a node failure using RSVP hello extensions. In a
> network making use of
> MPLS Traffic Engineering Fast Reroute as specified
> in [FAST-REROUTE],
> efficient use can be made of the network links when
> protecting against
> link/node failures. As described in [FACILITY],
> excess capacity used
> for bypass tunnels can be shared between bypass
> tunnels providing
> protection for mutually exclusive failures of
> different links or nodes.
> This results in significant bandwidth savings under
> the single failure
> assumption. Making use of the single failure
> assumption  implies the
> need  to distinguish a link from a node failure.
> However, the
> mechanisms currently available for failures
> detection do not always
> allow to distinguishing a link from a node failure.
> 
> Thanks.
> 
> JP. 
> 


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