RE: New agenda for today (Wed March 21)

[Jonathan Lang <jplang@calient.net>]

Cheng-Yin,
  The "secondary" LSP (A-G-H-I-J-K-E) has reserved resources on the links,
but they have not yet been allocated to it.  This means that signal on J-K
is not cross-connected to K-E until the resources are needed for the
failover.

Cheers,
Jonathan

> -----Original Message-----
> From: Cheng-Yin Lee [mailto:leecy@paragon-networks.com]
> Sent: Thursday, March 22, 2001 9:55 AM
> To: jplang@calient.net
> Cc: ccamp@ops.ietf.org
> Subject: Re: New agenda for today (Wed March 21)
> 
> 
> Hello,
> > 
> > Generalized MPLS Recovery Mechanisms, Jonathan Lang     (15 min)
> >         draft-lang-ccamp-recovery-00.txt
> 
> A question on one of the slides of this presentation showing extra
> traffic on an LSP (using links of the secondary path) being preempted
> when the primary path fails. As i recall, the slide shows something
> along this line :
> 
>     
> 
>        A--------B------C--------D------E
>        |                               |
>        |                               |
>  X-----G--------H------I--------J------K----Y
> 
> 
> A-B-C-D-E is the primary path
> A-G-H-I-J-K-E is the secondary path
> Another LSP X-G-H-I-J-K-Y was shown to carry extra traffic, 
> and this LSP
> will be preempted if a link on the path A-B-C-D-E fails. I don't quite
> follow how this works and how protection switching is effected. If a
> signal on J-K is cross connected to a signal on K-E for the secondary
> path how is the signal on J-K be cross connected to  K-Y for the extra
> traffic LSP? Could you pls clarify?
> 
> 
> thanks,
> cyl
>