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

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
>
> 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
> Sr. Technical Instructor

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Received on Fri Sep 25 2009 - 14:01:57 ART