Re: BGP

Raghav,

Just lab them up and see for yourself. Lab up everything you read on DOC-CD,
besides the books that you are working on.

Lab up the following scenarios:

   1. Connect two links between two routers in two different ASes.

                        |--------|

            AS100 |--------| AS200

   1. Connect a router in one AS, lets say AS 100, to two routers in AS
   200, and try to load balance for a network advertised by the two routers
in
   AS 200.

   1. Try unequal cost load balancing

   1. Connect a router in AS 100 to a router in AS 200 and another router in
   AS 300, and connect the router in AS 200 and 300 to another router in AS
   400, advertise a prefix in AS 400, and try to load balance on the router
in
   AS 100.

                        |-------AS200-----|

            AS100 |-------AS300-----| AS400

   1. Try the iebgp

On Mon, May 30, 2011 at 10:27 PM, Raghav Bhargava <
raghavbhargava12_at_gmail.com> wrote:

> Thanks guys..Appreciate all the inputs.
>
> -raghav
>
> On Mon, May 30, 2011 at 10:24 PM, Marko Milivojevic <markom_at_ipexpert.com
> >wrote:
>
> > That's pretty much it, again :-). Joe covered with his answer what
> > "bandwidth" does.
> >
> > However, when you look at alternate solutions, you may not need to
> > touch BGP at all - as long as you control both sides of the link (as
> > in a lab environment, for example).
> >
> > If you peer your BGP neighbors between Loopback interfaces, underlying
> > protocol used to learn next-hop will be used for load-sharing and/or
> > load-balancing. If that protocol supports unequal-cost load-sharing,
> > you can perform unequal-cost load-sharing of BGP-learned routes,
> > without ever touching any BGP attribute.
> >
> > This works only with two neighbors, though. As soon as you learn BGP
> > prefix from different BGP neighbors, best path selection takes place.
> >
> > --
> > Marko Milivojevic - CCIE #18427
> > Senior Technical Instructor - IPexpert
> >
> > FREE CCIE training: http://bit.ly/vLecture
> >
> > Mailto: markom_at_ipexpert.com
> > Telephone: +1.810.326.1444
> > Web: http://www.ipexpert.com/
> >
> > On Mon, May 30, 2011 at 21:49, Raghav Bhargava
> > <raghavbhargava12_at_gmail.com> wrote:
> > > Marko,
> > >
> > > The reason why i asked about load balancing was that if suppose i have
> 2
> > > equal paths to the same AS and i use this bgp dmz-link bw feature ,
> then
> > the
> > > bandwidth that i configure under the physical interface is only a
> > attribute
> > > which i can use to do load balancing. Will it impact the actual
> bandwidth
> > of
> > > the link. Sorry but i have not tried this in lab at the moment but will
> > > definitely try it. Also if we use this feature in a live network that
> > means
> > > i cannot use any other attribute in the same AS to modify the path for
> > > example Local pref because to use this feature all the path selection
> > > attribute should be default.Please correct me if i am wrong here.
> > >
> > > I was just trying to create different scenarios where if i use other
> BGP
> > > attributes for path selection will this feature create a issue.
> > >
> > > As far as load sharing is concerned, please correct me here that for
> ebgp
> > > links the cli is maximum-paths x and for ibgp links is maximum-path
> ibgp
> > x.
> > >
> > > Thats all i know people. not much as you all but trying to learn a
> little
> > > day by day. Once again thanks everyone for your valuable input.
> > >
> > > -Raghav
> > >
> > >
> > >
> > > On Mon, May 30, 2011 at 9:39 PM, Marko Milivojevic <
> markom_at_ipexpert.com>
> > > wrote:
> > >>
> > >> That's pretty much it. Now, let's see how we can build on that... :-)
> > >>
> > >> What remains unclear? Are there any other options you can use for
> > >> load-sharing and load-balancing of BGP-learned traffic other than
> > >> these two you mentioned? Also, what are the requirements for either
> > >> one to work?
> > >>
> > >> --
> > >> Marko Milivojevic - CCIE #18427
> > >> Senior Technical Instructor - IPexpert
> > >>
> > >> FREE CCIE training: http://bit.ly/vLecture
> > >>
> > >> Mailto: markom_at_ipexpert.com
> > >> Telephone: +1.810.326.1444
> > >> Web: http://www.ipexpert.com/
> > >>
> > >> On Mon, May 30, 2011 at 21:35, Raghav Bhargava
> > >> <raghavbhargava12_at_gmail.com> wrote:
> > >> > Hey garry,
> > >> >
> > >> > To answer your query , i did a little of bit research at my end but
> i
> > >> > wanted
> > >> > to know the answers from expert. Below is a short summary of load
> > >> > balancing
> > >> > & load sharing what i understand:
> > >> >
> > >> > Load balancing.
> > >> >
> > >> > To my understanding all the routing protocols do equal cost load
> > >> > balancing
> > >> > and it is only EIGRP that does unequal cost load balancing. But
> having
> > >> > said
> > >> > that BGP has a feature through which you can do unequal cost load
> > >> > balancing.
> > >> > the bgp dmz-link bw feature allows you to do unequal cost load
> > >> > balancing.
> > >> > Note cost in this will be the bandwidth that you configure under the
> > >> > specific ebgp interface.
> > >> >
> > >> > Load sharing.
> > >> >
> > >> > Load sharing can be done via the maximum path command under BGP
> > process
> > >> >
> > >> > Please feel free to chime in and ellaborate these if anyone wants.
> > >> >
> > >> >
> > >> > On Mon, May 30, 2011 at 9:23 PM, garry baker <baker.garry_at_gmail.com
> >
> > >> > wrote:
> > >> >>
> > >> >> maybe his yes and yes is just his way of saying, yes they sure do,
> to
> > >> >> encourage you to do a little bit of digging on your own...
> > >> >>
> > >> >>
> > >> >>
> > >> >>
> >
>
http://www.cisco.com/en/US/docs/ios/iproute_bgp/configuration/guide/irg_multi
_load_ps6441_TSD_Products_Configuration_Guide_Chapter.html
> > >> >>
> > >> >> --
> > >> >> Garry L. Baker
> > >> >>
> > >> >> "With sufficient thrust, pigs fly just fine..." - RFC 1925
> > >> >>
> > >> >>
> > >> >> On Tue, May 31, 2011 at 7:16 AM, Raghav Bhargava
> > >> >> <raghavbhargava12_at_gmail.com> wrote:
> > >> >>>
> > >> >>> Hey Marko,
> > >> >>>
> > >> >>> Good to know yes for both of them in BGP. Can you please elaborate
> > >> >>> your
> > >> >>> solutions.
> > >> >>>
> > >> >>> -Raghav
> > >> >>>
> > >> >>> On Mon, May 30, 2011 at 8:59 PM, Marko Milivojevic
> > >> >>> <markom_at_ipexpert.com>wrote:
> > >> >>>
> > >> >>> > 1. Yes.
> > >> >>> >
> > >> >>> > 2. Yes.
> > >> >>> >
> > >> >>> > --
> > >> >>> > Marko Milivojevic - CCIE #18427
> > >> >>> > Senior Technical Instructor - IPexpert
> > >> >>> >
> > >> >>> > FREE CCIE training: http://bit.ly/vLecture
> > >> >>> >
> > >> >>> > Mailto: markom_at_ipexpert.com
> > >> >>> > Telephone: +1.810.326.1444
> > >> >>> > Web: http://www.ipexpert.com/
> > >> >>> >
> > >> >>> > On Mon, May 30, 2011 at 20:49, Raghav Bhargava
> > >> >>> > <raghavbhargava12_at_gmail.com> wrote:
> > >> >>> > > Hey Experts,
> > >> >>> > >
> > >> >>> > > I have a question regarding BGP which is
> > >> >>> > >
> > >> >>> > > 1. Can we do load balancing in BGP ?
> > >> >>> > >
> > >> >>> > > 2. Load sharing ?
> > >> >>> > >
> > >> >>> > > I know this might have been repeated a lot many times but
> please
> > >> >>> > > if
> > >> >>> > someone
> > >> >>> > > can shed some insight on this will be really great.
> > >> >>> > >
> > >> >>> > > --
> > >> >>> > > Warm Regards
> > >> >>> > > Raghav
> > >> >>> > >
> > >> >>> > >
> > >> >>> > > Blogs and organic groups at http://www.ccie.net
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > _______________________________________________________________________
> > >> >>> > > Subscription information may be found at:
> > >> >>> > > http://www.groupstudy.com/list/CCIELab.html
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>> --
> > >> >>> Warm Regards
> > >> >>> Raghav
> > >> >>>
> > >> >>>
> > >> >>> Blogs and organic groups at http://www.ccie.net
> > >> >>>
> > >> >>>
> > >> >>>
> > _______________________________________________________________________
> > >> >>> Subscription information may be found at:
> > >> >>> http://www.groupstudy.com/list/CCIELab.html
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>
> > >> >
> > >> >
> > >> >
> > >> > --
> > >> > Warm Regards
> > >> > Raghav
> > >> >
> > >
> > >
> > >
> > > --
> > > Warm Regards
> > > Raghav
> > >
> >
>
>
>
> --
> Warm Regards
> Raghav
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

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