Re: BGP TTL

Kid no need to feel bad ..its just a opinion , just work on gainin knowledge
.till you are confident of justifying the cert that you hold .

On Fri, Oct 21, 2011 at 4:15 PM, GAURAV MADAN <gauravmadan1177_at_gmail.com>wrote:

> 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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>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>>
>>
>> --
>> With Warmest Regards,
>>
>> CCIE KID
>> CCIE#29992 (Security)
>>
>>
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>>
>> _______________________________________________________________________
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Received on Fri Oct 21 2011 - 22:18:10 ART