Mustafa, Don't take offense, I realize I may have come off a bit snappy. I was simply pointing out some information in case you didn't get a chance to see it. I really was helping out. >From what I understand: Maybe IPV6 just got set up - it goes INCOMPLETE if the link layer data as still forming. Reachable - You can get to it, ping it and everyone is happy. Stale could mean the neighbor IS reachable, maybe it was a minute ago but now it's not. Maybe due to the link not being used etc, so it goes STALE. Until someone else tries to communicate the state might change to REACHABLE ...or if there is physical problem or other it might go to INCOMPLETE if the link layer data is still forming...but never does goes to STALE he tricky thing is determining if STALE means you can't get to it and no traffic should go to it until it's declared REACHABLE. However, if it's not reachable, but traffic was recently sent then it could hit DELAY. If you can't get to it then it goes into PROBE which sends out the solicitations, but if it doesn't hear back.......it could go back to STALE? Confusing yes, but is it fun? Yes it is :) I'm sure I am wrong somewhere and someone will tell me. IPv6 = fun times to be had for the whole family! References: Under section 5.1 RFC2461 - Neighbor Discovery for IP Version 6 (IPv6)
The Neighbor Cache contains information maintained by the Neighbor Unreachability Detection algorithm. A key piece of information is a neighbor's reachability state, which is one of five possible values. The following definitions are informal; precise definitions can be found in Section 7.3.2. INCOMPLETE Address resolution is in progress and the link-layer address of the neighbor has not yet been determined. REACHABLE Roughly speaking, the neighbor is known to have been reachable recently (within tens of seconds ago). STALE The neighbor is no longer known to be reachable but until traffic is sent to the neighbor, no attempt should be made to verify its reachability. DELAY The neighbor is no longer known to be reachable, and traffic has recently been sent to the neighbor. Rather than probe the neighbor immediately, however, delay sending probes for a short while in order to give upper layer protocols a chance to provide reachability confirmation. PROBE The neighbor is no longer known to be reachable, and unicast Neighbor Solicitation probes are being sent to verify reachability. Read more: http://www.faqs.org/rfcs/rfc2461.html#ixzz0fAFmWT5d --- On Wed, 2/10/10, Mustafa Yadav <[email protected]> wrote: From: Mustafa Yadav <[email protected]> Subject: Re: [OSL | CCIE_RS] stale stands for whart To: "nicholas golden" <[email protected]> Cc: "ccie_rs" <[email protected]> Date: Wednesday, February 10, 2010, 10:57 AM good for you nick.but I hope you understand me why I am asking here.Sometimes even very basic quesiton be answered very good and there will be very trciky answer on it.I can google as well as you can:) even I know your videos on youtube.Google is good but asking you gurus is better than google.. good day. On 2/10/10, nicholas golden <[email protected]> wrote: > Did you read the RFC? > > http://www.faqs.org/rfcs/rfc2461.html > > Here is a piece of it > > IPV6 Neighbor discovery protocol RFC 2461. I looked for it in 2460 but did > not see it, took me all of about 20 seconds. I would really look these > things up on the RFC that's the bible of how things work. > > Here you go. > > " > STALE The neighbor is no longer known to be reachable but until traffic is > sent to the neighbor, no attempt should be made to verify its reachability. > > Read more: http://www.faqs.org/rfcs/rfc2461.html#ixzz0f9rsyGI3"; > > > > I'm just another student here, but google and RFC-editor.org are my buddies! > > -Nick > --- On Wed, 2/10/10, Mustafa Yadav <[email protected]> wrote: > > > From: Mustafa Yadav <[email protected]> > Subject: [OSL | CCIE_RS] stale stands for whart > To: "ccie_rs" <[email protected]> > Date: Wednesday, February 10, 2010, 9:58 AM > > > hi guys, > > in ipv6 what does stale stands for exactly? > please help > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > >
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