Re: BGP TTL

I agree ! DOUBT is DOUBT ..

and being a CCIE doesn't mean you stop clarifying doubts in your mind ..

On Fri, Oct 21, 2011 at 5:45 PM, CCIE KID <eliteccie_at_gmail.com> wrote:

> Hey abdul,
>
> See I know the stuff, I just want to confirm with the brains in GS. So when
> someone asks a basic question , is he a dumbo?
> Good engineers are the ones who explains and not criticizes when someone
> asks a basic question ?
>
> There is nothing called as GOOD DOUBT or BAD DOUBT. It depends upon the
> person who takes this question.
> I am really worried with ur words and feeling really bad.
>
>
>
> On Fri, Oct 21, 2011 at 5:36 PM, Routing Freak <routingfreak_at_gmail.com
> >wrote:
>
> > Then buddy all OSPF update packets are sent with a TTL of 1 to their
> > directly connected neighbors , so when the neighbors receive the packet ,
> > decrement the TTL to 0 and drop the packet ahh. Naa this will not happen
> >
> > TTL decrement will happen only on outbound .
> >
> >
> > On Fri, Oct 21, 2011 at 5:20 PM, Imran Ali <immrccie_at_gmail.com> wrote:
> >
> >> Hi kid,
> >>
> >> regardsless of data plane or control pale TTL value is reduced .
> >>
> >> The moment any interface receives a packet the TTL will be reduced by 1
> .
> >>
> >> On Fri, Oct 21, 2011 at 2:25 PM, CCIE KID <eliteccie_at_gmail.com> wrote:
> >>
> >> > Hi fellas,
> >> >
> >> > I am working on BGP and i find in sh ip bgp neighbor command, the
> >> incoming
> >> > TTL and the outgoing TTL . I understood the outgoing TTL is the one
> when
> >> > the
> >> > control plane packets are generated , the TTL in the IP Header will be
> >> 255.
> >> > I find the incoming TTL to 0 . Can anyone explain me what is actually
> >> meant
> >> > by incoming TTL.
> >>
> >>
> >>
> >> > My understanding is the incoming TTL is the when the
> >> > neighbor send u any BGP Control plane packet, the local router is
> >> expecting
> >> > this TTL value in the IP HEader. Am i right ?
> >> > So the incoming TTL valus is 0 in my case..
> >> >
> >>
> >> regardless of any operation , the TTL value is always present in ip
> >> header
> >> :-
> >>
> >> >
> >> > Router drops a packet with a TTL value of 0. So when the control plane
> >> > packet comes. it should be of TTL of 1.
> >> > TTL will be only decremented on the outgoing interface and not the
> >> incoming
> >> > interface. THe genreal logic says that the TTL of all control plane
> >> packets
> >> > of all IGPS will be 1 and so when a router receives this control plane
> >> > packet , it is destined to itself , it will update the OSPF or EIGRP
> RIB
> >> > and
> >> > in turn do the local computation for the best path .
> >> >
> >> > My question is whether the where does the TTL decrement happen ? My
> >> answer
> >> > is outbound and for any other control plane packet it will be destined
> >> to
> >> > itslef , so there will be no decrement in the TTL
> >> >
> >> > --
> >> > With Warmest Regards,
> >> >
> >> > CCIE KID
> >> > CCIE#29992 (Security)
> >> >
> >> >
> >> > Blogs and organic groups at http://www.ccie.net
> >> >
> >> >
> _______________________________________________________________________
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> >> _______________________________________________________________________
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
>
>
> --
> With Warmest Regards,
>
> CCIE KID
> CCIE#29992 (Security)
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Fri Oct 21 2011 - 18:45:36 ART