[c-nsp] Re : BFD on ASR 9000

[Marc Binderberger]

Hello Chams,

> My firewall is using bfd and when typing "show bfd session" on it, it shows me 
> down sessions

problem #2 solved :-)


> and here is the "show bfd client", (i'm using bfd for my ISIS configuration)
> 
> Name            Node       Num sessions  
> --------------- ---------- --------------
> MPLS-TE         0/RSP0/CPU 3             
> bgp-0           0/RSP0/CPU 0             
> bgp-0           0/RSP1/CPU 0             
> ipv4_static     0/RSP0/CPU 0             
> ipv4_static     0/RSP1/CPU 0             
> isis-IGP-MPLS   0/RSP0/CPU 3             
> isis-IGP-MPLS   0/RSP1/CPU 0             
> pim             0/RSP0/CPU 3             
> pim             0/RSP1/CPU 0             
> rsvp            0/RSP0/CPU 0             
> rsvp            0/RSP1/CPU 0          


So BGP is not telling BFD anything about the session it wants - "0".
Thus "show bfd session" shows nothing about it.

Odd. The eBGP session between ASR and FW is UP, right? What kind of
interface it this? I would guess (gig-)Ethernet but better ask. Vlans in
the game?


Regards, Marc

> ----- Message d'origine ----
> De : Marc Binderberger <marc at sniff.de>
> À : Gert Doering <gert at greenie.muc.de>
> Cc : chams <chams_b at yahoo.fr>; cisco-nsp at puck.nether.net
> Envoyé le : Mar 1 février 2011, 13h 42min 16s
> Objet : Re: [c-nsp] BFD on ASR 9000
> 
> 
> Hello Gerd and Chams,
> 
> > My guess is that your unnamed firewall doesn't do BFD...
> 
> that is problem #2  ;-) - but it still should show up with "show bfd session"
> on the ASR9k as a DOWN session.
> 
> The eBGP session must be non-multihop, i.e. it must be between the
> addresses of the link ASR9k--FW. I assume this is what you mean
> with point-to-point?
> 
> BFD really doesn't know anything about "i" or "e"-BGP. All it requires
> is a "bfd fast-detect" line under the BGP neighbor.
> 
> What is "show bfd client" showing?
> 
> 
> Regards, Marc
> 
> 
> 
> > On Tue, Feb 01, 2011 at 10:31:10AM +0000, chams wrote:
> > > I have to configure a bfd session between my ASR and a Firewall, over a BGP 
> > > session.
> > > but after configuration i ca't even see the configured session when doing a 
> > > "show bfd session".
> > > by  reading some cisco docs, i've seen that BFD can be configured onlu on  
> >point 
> >
> > > to point eBGP session, my ASR and Firewall have an eBGP point to  point 
> >session 
> >
> > > but they belong to the same confederation (perhaps BFD see  it as iBGP 
> >session)
> > 
> > My guess is that your unnamed firewall doesn't do BFD...
> > 
> > gert
> > -- 
> > USENET is *not* the non-clickable part of WWW!
> >                                                            //www.muc.de/~gert/
> > Gert Doering - Munich, Germany                            gert at greenie.muc.de
> > fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
> 
> 
> 
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> 
> -- 
> Marc Binderberger        <marc at sniff.de>        Powered by *BSD ;-)
> 
> 
> 
>       
> 
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