The MPLS WG Archive

[Curtis Villamizar <curtis@fictitious.org>]

In message <1117F7D44159934FB116E36F4ABF221B0267EDA8@celox-ma1-ems1.celoxnetwor
ks.com>, "Gray, Eric" writes:
> And so, naturally, you could make this same argument for
> how an ECMP splitter would test out all of the equal cost
> paths...


The ECMP split affects the primary path.  The traffic for a branch has
to be injected upstream of the branch or you are not adequately
testing it.  There is no way to send traffic from upstream of a detour
to exercise a detour that is not in use.

Curtis


> Eric W. Gray
> Systems Architect
> Celox Networks, Inc.
> egray@celoxnetworks.com
> 508 305 7214
> 
> 
> > -----Original Message-----
> > From: George Swallow [mailto:swallow@cisco.com]
> > Sent: Friday, December 13, 2002 2:22 PM
> > To: curtis@fictitious.org
> > Cc: Shahram Davari; mpls@UU.NET; swallow@cisco.com
> > Subject: Re: Last call on LSP Ping
> > 
> > > Currently you'd have to do that from each PLR.  We don't provide a
> > > means to tell the ingress of the existance of a detour (except the
> > > local-protect-available bit in the signaling itself which one major
> > > implementation wasn't using last I checked).  We also don't provide a
> > > means to tell a specific PLR to exercise its detour and report back.
> > >
> > > Let's wait and hear from Kireeti or other authors whether they think
> > > anything should be added or whether the intent is to require testing
> > > initiated at each PLR.
> > 
> > The PLR is responsible for the bypass.  It knows what sender-template
> > it used, so it can form the proper FEC for the ping.  It can send a
> > lsp-ping with the proper label stack.  So it is the natural place to
> > do this.  If it fails, it should
> > 
> > a) report to network management
> > b) reset the backup in place bit
> > c) look for another way of establishing a backup
> > d) if successful on c) set the backup in place bit.
> > 
> > You may want to put a hold-down on b) to avoid reporting to the
> > head-end on a transient situation.
> > 
> > I don't see what advantage you would gain by moving all this to the
> > head-end.  I do see a lot of complications...
> > 
> > ...George
> > 
> > 
> > ==================================================================
> > George Swallow       Cisco Systems                  (978) 497-8143
> >                      250 Apollo Drive
> >                      Chelmsford, Ma 01824
>