Re: BGP Graceful restart - RFC 4724

Good to highlight aware and capability differences:

BGP support for NSF requires that neighbor routers are NSF-aware or
NSF-capable. NSF awareness in BGP is also enabled by the graceful restart
mechanism. A router that is NSF-aware functions like a router that is
NSF-capable with one exception: an NSF-aware router is incapable of performing
an SSO operation. However, a router that is NSF-aware is capable of
maintaining a peering relationship with a NSF-capable neighbor during a NSF
SSO operation, as well as holding routes for this neighbor during the SSO
operation

--
BR
Tony
Sent from my iPad
On 30 Nov 2012, at 13:22, Joe Sanchez <marco207p_at_gmail.com> wrote:
> Tauseef, please see below.
>
> 1.  No need for community strings.  BGP graceful restart capability will be
exchanged between BGP peers during the OPEN phase of the neighborship
exchange.  This is enable under the BGP process peer statements.
>
> 2.  When a peer sees a neighbor reset , it will hold all of the routes from
that peer but will mark them as STALE.  When the peer comes back online it
will again exchange the BgP graceful restart flag and this peer will exchange
routes with one another an it will update its routing table .
>
>
>
> Regards,
> Joe Sanchez
>
> ( please excuse the brevity of this email as it was sent via a mobile
device.  Please excuse misspelled words or sentence structure.)
>
> On Nov 29, 2012, at 4:08 AM, Tauseef Khan <tasneemjan_at_googlemail.com>
wrote:
>
>> I am reading up on RFC 4724  - BGP Graceful restart for EOR marker.
>>
>> http://tools.ietf.org/html/rfc4724
>>
>> Appreciate if some one could clarify.
>> 1.  to configure on an ios router do you need to send extended community
to
>> the peers or it ios router it should work with just bgp graceful-restart
>> under bgp process.
>> 2. with the bgp grceful restart whena peer sees tcp/179 reset from the
>> peer will it still have the routes from receiving peer in routing table or
>> just in the RIB and when it sees tcp/179 socket again it will install
>> routes from RIB in the FIB (routing table) rather then receiving all the
>> bgp RIB again from the peer.
>> 3. If some one knows a good link from cco on this please let me know.
>>
>> thanks in advance and regards
>>
>>
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