From: Ahmed Elhoussiny (aelhoussiny@gmail.com)
Date: Sat Aug 09 2008 - 17:50:31 ART
if you wanna filter/Limit routes sent from Router X to router Y , and filter
must be implemented on Router Y
can we consider ORF ?
On 8/7/08, Luan M Nguyen <luan@t3technology.com> wrote:
>
> How do you *choose* what to send and what not?
> If it's easy, I am sure this feature has been proposed and implemented
> already :)
> In real life, maybe you could use a script to check the advertised-route,
> if
> exceed a certain amount, then configure prefix-lists to only send a certain
> routes...etc
>
> -Luan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Roger RPF
> Sent: Thursday, August 07, 2008 11:00 AM
> To: 'Joseph Brunner'; 'Victor Cappuccio'
> Cc: 'GS CCIE-Lab'
> Subject: AW: limit BGP prefixes sent to a neighbor
>
> Hmmmm...do I understand it wrong? Doing the limitation on Y does only
> prevent Y from installing/accepting too many routes but it does not prevent
> X from sending too many routes, isn't it?
>
>
> http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_bgp3.html#
> wp1014777
>
> If my task says, that I have to configure it on X, limiting the ammount of
> routes he is sending, what then??
>
> But I agree with you, I think it is just a misswording in the task. But is
> it not an interesting question at all? How to limit the sent routes?
>
> regards
>
> Roger
>
> -----Urspr|ngliche Nachricht-----
> Von: Joseph Brunner [mailto:joe@affirmedsystems.com]
> Gesendet: Donnerstag, 7. August 2008 16:44
> An: 'Roger RPF'; 'Victor Cappuccio'
> Cc: 'GS CCIE-Lab'
> Betreff: RE: limit BGP prefixes sent to a neighbor
>
> >Sure, I know, I could configure on y neighbor x.x.x.x max-prefix 5 to
> limit
> >the received routes but the task says to limit the routes sent from x to
> y.
>
> Say it a few times to yourself. Doing the limitation on Y IS LIMITING THE
> ROUTES SENT from x to y!
>
> So sometimes we need to think in both directions at the same time.
>
> I would say that is what the workbook wanted.
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Roger RPF
> Sent: Thursday, August 07, 2008 5:55 AM
> To: 'Victor Cappuccio'; 'Joseph Brunner'
> Cc: 'GS CCIE-Lab'
> Subject: AW: limit BGP prefixes sent to a neighbor
>
> Hi all,
>
> Well, interesting solution to define a vrf and specify the max prefixes
> allowed in the vrf. So in this case I would never send more than the
> specified amount. But the drawback, as Victor said, is that with this I
> would also limit the max routes I can receive in this vrf (if I understand
> that correct).
>
> My task is that router x should only advertise 5 routes to it's bgp
> neighbor
> y because y has not enough memory (just a fictive example). The 5 routes
> are
> not specified, so I don't know which one.
>
> Sure, I know, I could configure on y neighbor x.x.x.x max-prefix 5 to limit
> the received routes but the task says to limit the routes sent from x to y.
>
> Hmmm....
>
> thanks
>
> Roger
>
> -----Urspr|ngliche Nachricht-----
> Von: Victor Cappuccio [mailto:vcappuccio@gmail.com]
> Gesendet: Donnerstag, 7. August 2008 11:39
> An: Joseph Brunner
> Cc: Roger RPF; GS CCIE-Lab
> Betreff: Re: limit BGP prefixes sent to a neighbor
>
> Hi Jose,
>
> Those 2 are also are used to set the maximum amount of prefixes
> *received* and not only for information learned by a VRF via MP-BGP
> between PE and PE or BGP between the PE and the CE, but also for any
> routing context running between the PE and the CE routers. (rip, ospf
> whateva), I think that an alternative to Roger question could be the
> use of prefix-list and/or community lists and/or as-path list, but I
> am not sure if there is any mechanism to control the Max number of
> routes to *send* to a neighbor (say only 3 routes sent to neighbor X)
>
> Good question...
>
>
> On Thu, Aug 7, 2008 at 10:28 AM, Joseph Brunner <joe@affirmedsystems.com>
> wrote:
> > Sure; (warning I'm goofy)
> >
> > Does this count?
> >
> > 1. config vrf
> >
> > ip vrf 1001
> > rd 65000:1001
> > route-target both 65000:1001
> > maximum routes 1000 500 <- where we would limit to 1000, but warn at 500
> >
> >
> > 2. Place interface into vrf
> >
> > Int s0/0
> > Ip vrf forwarding xxxx
> >
> >
> > Run afi ipv4 to push the vrf routes from this router to our neighbor via
> > bgp...
> >
> > Router bgp 65000
> > Neighbor 1.1.1.1 remote-as 1
> >
> > address-family ipv4 unicast vrf 1001
> > Neighbor 1.1.1.1 activate
> >
> >
> > Of course if the other side of this router is to another bgp peer, you
> could
> > put that interface in a vrf, say that didn't have the max routes
> configured,
> > and add the route targets to get routes between the vrf's.
> >
> > -Joe
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Roger RPF
> > Sent: Thursday, August 07, 2008 5:10 AM
> > To: 'GS CCIE-Lab'
> > Subject: limit BGP prefixes sent to a neighbor
> >
> > Hi group,
> >
> >
> >
> > Is there a way to limit the maximum amount of prefixes that BGP sends to
> a
> > neighbor? I know that with neighbor x.x.x.x max-prefix I can limit the
> > received ones, but in sending direction?
> >
> >
> >
> > regards
> >
> >
> >
> > Roger
> >
> >
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> >
> >
> >
> >
> >
> >
> >
>
>
>
> --
> Victor Cappuccio
> CCIE R/S# 20657
> CCSI# 30452
> www.anetworkerblog.com
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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