[c-nsp] Re : Re : BFD on ASR 9000

[Marc Binderberger]

Hello,

odd. There was a restriction for BGP requesting BFD on Vlan on a _Bundle_. Normal interfaces should work though.

Sorry, no further idea ... .


Regards, Marc



On 2011-02-01, at 3:08 PM, chams wrote:

> Hi,
> it's a TengigaEthernet interface, but i'm using sub interfaces.
> And, right, the bgp is UP.
> 
> 
> 
> 
> 
> ----- Message d'origine ----
> De : Marc Binderberger <marc at sniff.de>
> À : chams <chams_b at yahoo.fr>
> Cc : Gert Doering <gert at greenie.muc.de>; cisco-nsp at puck.nether.net
> Envoyé le : Mar 1 février 2011, 14h 58min 12s
> Objet : Re: [c-nsp] Re :  BFD on ASR 9000
> 
> 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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> 
> -- 
> Marc Binderberger        <marc at sniff.de>        Powered by *BSD ;-)
> 
> 
> 
> 
> 

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Marc Binderberger           <marc at sniff.de>