Jinmei,
Makes sense, I've always struggled with that paragraph too, it's quite hard to
follow.
I'll make the change to something similar to what you have below.
thx
Hesham
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> Sent: Friday, February 11, 2005 3:11 PM
> To: Erik Nordmark
> Cc: Pekka Savola; Soliman, Hesham; IPv6 WG
> Subject: Re: IPv6 WG Last Call:draft-ietf-ipv6-2461bis-01.txt
>
>
> Catching up a possibly minor point of an old thread...
>
> >>>>> On Thu, 13 Jan 2005 10:39:15 -0800 (PST),
> >>>>> Erik Nordmark <[EMAIL PROTECTED]> said:
>
> >> ==> AFAICS, you can remove 'both the Override flag is
> clear and' here,
> >> because the same result happens if the Override flag is set.
>
> > No. The "but do not update the entry in any other way"
> does not apply when the
> > O flag is set, since in that case the recorded link layer
> address is updated.
>
> I'm not sure if this really rejects Pekka's point. In fact, it seems
> to me Pekka is correct here. To make it sure, I've cited the related
> part from the draft:
>
> If the Override flag is clear and the
> supplied link-layer address differs from that in the
> cache, then one
> of two actions takes place: if the state of the entry is
> REACHABLE,
> set it to STALE, but do not update the entry in any other way;
> otherwise, the received advertisement should be ignored
> and MUST NOT
> update the cache. If the Override flag is set, both the Override
> flag is clear and the supplied link-layer address is the
> same as that
> in the cache, or no Target Link-layer address option was supplied,
> the received advertisement MUST update the Neighbor Cache entry as
> follows:
> (Section 7.2.5 of draft-ietf-ipv6-2461bis-01.txt)
>
> This awfully complicated block would be clarified as follows (BTW,
> regardless of the result of this small discussion, it would
> be nice if
> we could make this part more understandable in the 2461bis work):
>
> 1. If the Override flag is clear and the supplied link-layer address
> differs from that in the cache, then:
> - if the state of the entry is REACHABLE, set it to STALE, but
> do not update the entry in any other way;
> - otherwise, the received advertisement should be ignored and
> MUST NOT update the cache.
>
> 2. (else) If
> - the Override flag is set,
> - both the Override flag is clear and the supplied link-layer
> address is the same as that in the cache, or
> - no Target Link-layer address option was supplied,
> then
> the received advertisement MUST update the Neighbor Cache entry
> as follows:
> [snip]
>
> Pekka talked about the second bullet of case 2, whereas you referred
> to (a part of) the 1st bullet of case 1. And, in my understanding,
> cases 1 and 2 are mutually exclusive.
>
> JINMEI, Tatuya
> Communication Platform Lab.
> Corporate R&D Center,
> Toshiba Corp.
> [EMAIL PROTECTED]
>
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