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

Okok! gotcha!

On Sat, Jan 23, 2010 at 12:52 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> The issue with the /24 loopbacks is that you will actually not have a
> label for the LER in the MPLS cloud. What will happen is that by
> default OSPF will advertise that /24 loopback as a /32. LDP on the
> other hand will advertise the /24. Since your LFIB is based in part
> by your existing routing table, and the label you received does not
> match the prefix in your RIB (/24 vs /32) the label will never be
> installed.
>
> On Fri, Jan 22, 2010 at 1:58 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>
> wrote:
> > 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
> >> >> >
> >> >> > Mailto: markom_at_ipexpert.com <mailto:markom_at_ipexpert.com>
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> >> >> > Fax: +1.810.454.0130
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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
> >
>
>
>
> --
> Regards,
>
> Joe Astorino CCIE #24347 (R&S)
> Sr. Technical Instructor - IPexpert
> Mailto: jastorino_at_ipexpert.com
> Telephone: +1.810.326.1444
> Live Assistance, Please visit: www.ipexpert.com/chat
> eFax: +1.810.454.0130
>
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-- 
Sent from Bengaluru, Karnataka, India
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