[c-nsp] The mechanics of SSO

[Ross Vandegrift]

On Thu, May 07, 2009 at 02:03:44AM +0300, Ibrahim Abo Zaid wrote:
> actually i can't get if SUP running SSO why you think configuration will be
> loaded from active to standby during switchover ? !
>
> SSO maintains control plane and data plane resiliency and both SUP have
> active IOS image and synchronized configuration

Not during switchover - during bootup.  When the standby SUP is
booting, it needs to fetch the config from the active.

That is the syncronization problem I ran into yesterday.

Ross

> 
> 
> best regards
> --Ibrahim
> 
> 
> 
> On Wed, May 6, 2009 at 11:50 PM, Ross Vandegrift <ross at kallisti.us> wrote:
> 
> > On Wed, May 06, 2009 at 04:39:40PM -0400, Jared Mauch wrote:
> > > I would recommend trying to get the devices on SXF16 or SXI1 if
> > > possible.  You may need to send a break and interrupt the boot process
> > > on one (hope you have good OOB and know how to do this).
> >
> > What do you mean "you may need to send a break and interrupt the boot
> > process on one"?  I mean, I know how to do that, and know why I might
> > under a variety of conditions, but what circumstances are you
> > referring to?
> >
> > We've been stuck on SXF becasue of the CSM, but after hitting this
> > bug, we'll be spinning up our CSMs in a spare chassis just so we can
> > avoid the bug that started the whole damn thing.
> >
> > > This is also reinforces the reason some people do not run dual
> > > processor systems.  They sometimes fail in really bad ways.
> >
> > Indeed, though honestly, it was no worse than the reboot time we'd see
> > from a single SUP.  And it has saved me before.
> >
> > I can imagine that others may have seen much worse from dual SUPs :)
> >
> > --
> > Ross Vandegrift
> > ross at kallisti.us
> >
> > "If the fight gets hot, the songs get hotter.  If the going gets tough,
> > the songs get tougher."
> >        --Woody Guthrie
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> >
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-- 
Ross Vandegrift
ross at kallisti.us

"If the fight gets hot, the songs get hotter.  If the going gets tough,
the songs get tougher."
	--Woody Guthrie