Re: Is there a methodical way to check full reachability?

The PHP will occur one hop early.
That's why I asked if MPLS is present in R&S lab :)

Divin Mathew John @ 22/01/2010 15:49 -0300 dixit:
> Wht will happen?
>
> On Sat, Jan 23, 2010 at 12:17 AM, Joe Astorino <jastorino_at_ipexpert.com
> <mailto:jastorino_at_ipexpert.com>> wrote:
>
> Indeed....using MPLS and having a broken LSP somewhere in the middle
> can result in having routes but no reachability : ) Try running MPLS
> L3 VPN with OSPF over frame-relay in your SP "core" and make your PE
> loopbacks /24s and see what happens : )
>
> On Fri, Jan 22, 2010 at 1:18 PM, Divin Mathew John
> <divinjohn_at_gmail.com <mailto:divinjohn_at_gmail.com>> wrote:
> > R1--- r2--- R3
> > R1 thinks R2 is next hop for R3 Lo0. and R2 Thinks R1 is next hop
> for R3'
> > Lo0
> >
> >
> > On Fri, Jan 22, 2010 at 10:27 PM, Carlos G Mendioroz
> <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> > wrote:
> >>
> >> Would you please show a simple example where you have routes and
> >> not reachability ? Obviously without ACLs blocking traffic.
> >>
> >> -Carlos
> >>
> >> Marko Milivojevic @ 22/01/2010 8:54 -0300 dixit:
> >> > On Thu, Jan 21, 2010 at 23:51, Carlos G Mendioroz
> <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> >> > wrote:
> >> >> Or you can use the thoughtfull (sp?) way of verifying that all
> your
> >> >> networks have indeed routes in all your routers, and that you have
> >> >> no routing (change) activity (i.e. debug routing).
> >> >
> >> > Having routes in the routing table does not mean reachability :-).
> >> >
> >> > Having pings working, doesn't mean full routing convergence :-).
> >> >
> >> > --
> >> > Marko Milivojevic - CCIE #18427
> >> > Senior Technical Instructor - IPexpert
> >> >
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> >> --
> >> Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> LW7 EQI Argentina
> >>
> >>
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> >>
> >>
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> >>
> >>
> >>
> >>
> >
> >
> >
> > --
> >
> > Sent from Bengaluru, Karnataka, India
> >
>
>
>
> --
> Regards,
>
> Joe Astorino CCIE #24347 (R&S)
> Sr. Technical Instructor - IPexpert
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> Sent from Bengaluru, Karnataka, India

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net