Re: QS: FIB and RIB: what is the difference

Hi Narbik,

As usual great reply

keep it up boss :)

On Fri, Sep 25, 2009 at 10:01 PM, Tony Varriale
<tvarriale_at_flamboyaninc.com>wrote:

> It's actually very revelant as the info he is quoting is from systems
> that's have the capability to download fib onto hardware/linecard.
>
> What you described is more of the foundation and is more accurate in a
> base sense.
>
> You can't download fib to hardware that doesn't exist.
>
> Sent from my iPhone
>
> On Sep 25, 2009, at 12:30 PM, Narbik Kocharians <narbikk_at_gmail.com>
> wrote:
>
> > When you look at RIB and FIB you have to think of the 2 major and
> > most important components of routing:
> >
> > Control Plane
> > Data Plane
> > The control plane takes care of the routing information exchange,
> > and in MPLS environment, label exchange between adjacent devices.
> > What do we have and see in the control plane? Routing protocols,
> > exchange of routing information, RIB (Routing Information Table) and
> > once again in an MPLS environment you will also see a Label Exchange
> > Protocol such as LDP.
> >
> > So therefore control plane builds a routing table or RIB based on
> > the routing protocols.
> > The control plane builds/populates 2 forwarding tables: a FIB (Which
> > is built from the information in the RIB) and in MPLS networks an
> > LFIB (Label Forwarding Information Base). These (FIB and LFIB) exist
> > and work in the Data plane.
> >
> > The data Plane is simply a forwarding engine that is independent of
> > the routing protocol or Label exchange protocol type; this Plane
> > forwards packets to the appropriate interface based on the info
> > found in the FIB or LFIB.
> >
> > So the way I envision it:
> >
> > You use a routing protocol to advertise routes upstreamb&b&and if
> > any of the upstream routers need to connect to the advertised networ
> > ks, they connect downstream toward the destination.
> >
> > Now this is a very brief and basic explanation of the RIB, FIB and
> > LFIB.
> >
> > Now weather they are hardware based or software based I think is
> > irrelevant when you look at different platforms.
> >
> >
> > On Fri, Sep 25, 2009 at 9:24 AM, Tony Varriale <
> tvarriale_at_flamboyaninc.com
> > > wrote:
> > That's making a poor assumption that the device you are speaking
> > about is
> > hardware based.
> >
> > More than half of people won't come in contact with those devices
> > (with the
> > exception of a 6500).
> >
> > tv
> >
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf
> > Of
> > Anthony Sequeira
> > Sent: Friday, September 25, 2009 10:13 AM
> > To: Syed Khalid Ali
> > Cc: ccielab_at_groupstudy.com
> > Subject: Re: QS: FIB and RIB: what is the difference
> >
> > The Routing Information Base is the copy of the routing table stored
> > in software on the Cisco device.
> >
> > The Forwarding Information Base is the copy of the routing table
> > stored in hardware on the Cisco device.
> >
> > Thanks to Cisco Express Forwarding (CEF) and its use of the FIB,
> > performance for Cisco routers is much improved.
> >
> > Warmest Regards,
> >
> > Anthony J. Sequeira, CCIE #15626
> > http://www.INE.com <http://www.ine.com/>
> >
> > Test your Core Knowledge today!
> > Q: What protocol supports load-balancing with first-hop redundancy?
> > A: gateway load balancing protocol
> > More Info:
> >
>
> http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html
> >
> >
> > On Sep 25, 2009, at 10:47 AM, Syed Khalid Ali wrote:
> >
> > > dear group,
> > >
> > > I just started to prepare for R&S track. While going through the "ip
> > > packet
> > > debug command" these two terms just popped up.
> > > What is the difference between these two?
> > >
> > > Thanks
> > > Khalid
> > >
> > >
> > >
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> >
> >
> >
> >
> >
> >
> >
> > --
> > Narbik Kocharians
> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> > www.MicronicsTraining.com <http://www.micronicstraining.com/>
> > Sr. Technical Instructor
>
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-- 
Salah
CCIE #24207
Blogs and organic groups at http://www.ccie.net