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

Thanks mate. I have read some of your posts, you are pretty good yourself.

On Fri, Sep 25, 2009 at 2:14 PM, Salah ElShekeil
<salah.elshekeil_at_gmail.com>wrote:

> 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
>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
Blogs and organic groups at http://www.ccie.net