BGP TTL

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..

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

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CCIE#29992 (Security)
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