Hi Lou,
Since no one offered objection - lets make this a WG document when
refreshed. See below:
Lou Berger wrote:
Hi Acee,
See below.
At 04:47 PM 11/28/2006, Acee Lindem wrote:
Hi Lou,
Lou Berger wrote:
Acee,
See below.
At 06:37 PM 11/20/2006, Acee Lindem wrote:
Hi Lou,
See inline.
Lou Berger wrote:
Acee,
See responses in-line below.
Should the corrected version go in as draft-berger or draft-ietf?
Lou
At 07:03 PM 11/13/2006, Acee Lindem wrote:
[...]
Section 3.1 - Type 9 LSA - "keep" rather than "keepk".
yes. Also I added the following to the beginning of the section:
Section 13 of [OSPF] describes the OSPF flooding procedure.
Those procedures MUST be followed as defined except where
modified in this section.
I believe we
should discard a link-local LSA received from
a neighbor not
on the interface (text similiar to type 11).
okay, updated as follows:
o If the Opaque LSA is type 9 (the flooding scope is link-local)
and the interface that the LSA was received on is not the same
as the target interface (e.g., the interface associated with a
particular target neighbor), the Opaque LSA SHOULD be discarded
and not acknowledged, and MUST NOT be flooded out that interface
(or to that neighbor). An implementation SHOULD keep track of
the IP interface associated with each Opaque LSA having a
link-local flooding scope.
I guess I think that if you discard an LSA, it is implied that you
won't
reflood it.
it does say "and MUST NOT be flooded". I'm open to alternate wording.
In every other instance where an LSA is discarded in RFC 2328 we don't
explicitly state that we don't reflood them. In other words, why would
anybody get the misconcept we'd ever reflood anything that was
discarded.
ahh, I thought you *wanted* the explicit text. The primary reason for
the seemingly redundant directives is that's how it was done in 2370
(see type 11). Also, for type 9 and 10, one is a SHOULD (ignore) and
the other is a MUST NOT(flood). The ignore part is IMO implicit in
OSPF/2370, but isn't explicit so I've put it as a SHOULD. I have no
issue changing this a MUST.
I think saying the LSAs are discarded is enough.
[...]
5.1 Inter-Area Considerations
......
Section 5.1
Type-9 opaque LSAs and type-10 opaque LSAs do not have this
problem
as a receiving router can detect an a loss of reachability
through the intra-area
SPF calculation.
Section 5.1
To enable OSPF routers in remote areas to check availability of
the
originator of link-state type 11 opaque LSAs, the orignators of
type-11 opaque LSAs are considered Autonomous System Border
Routers (ASBRs) and will advertise themselves as such.
Section 5.1 - Remove "It is important to note that this solution
MUST NOT ..."
This is redundant.
which part is redundant, just the sentence you are asking to be
removed? I agree that it is redundant with 2328, but I thin
mentioning it is still useful. Will rephrase to remove directive.
This part of the specification doesn't modify stub area behavior.
Here, we are talking about validating AS scoped opaque LSA.
I guess you could say, "Note that AS scoped opaque LSA
validation is not applicable to stub and NSSA areas since LSAs
with AS scope are not flooded into these areas types." However,
I don't see it as necessary.
here's what I have now: "It is important to note that per
[OSPF] this solution does not apply to OSPF stub areas or NSSAs as
neither type-11 LSAs are flooded nor are type-4 LSAs originated into
such areas."
As you mentioned above, it is worth explicitly stating things
sometimes.
Okay - I'll concede though I don't think it is necessary. Can we
call say "AS scoped opaque LSAs" rather than type-11s.
sure.
Great.
Also, do
we have to add the detail about the ASBR-summary-LSAs (as they
are referred to RFC 2328).
This is just an informative statement on an issue that was previously
missed. I'd prefer to keep it. That said, if you really feel
strongly about it, we can remove the whole thing as it's just
informative.
Ok.
Remove numbered items (1) and (2), these actions ARE NOT new to
opaque LSAs. Make (3) a separate paragraph rather than numbered
item.
But inclusion of type-11 originate routers as ASBR is new. Will
rephrase to make clear that existing ospf requirements apply.
How about:
The procedures related to inter-area opaque LSAs are as follows:
(1) An OSPF router that is configured to originate AS-scope opaque
LSAs advertise themselves as ASBRs and MUST follow the related
requirements related to setting of the Options field E-bit in
OSPF Hello packets and LSA headers as specified in [OSPF].
(2) When ....
I don't think these points need to be restated even if they reference
RFC 2328. Opaque LSAs don't modify these conditions. Hence,
I don't see them to be required any more than stating the version
field
the OSPF packet header should be set to 2.
huh? opaque LSAs aren't present in 2328 and the specification of
E-bit setting/handling in 2328 is largely relative to AS-external-LSAs.
The E options bit must be set in hellos for any regular (not stub or
NSSA) area
independent of any opaque support. Opaque LSAs don't change this at all.
yes, but the use of the E-bit due to Opaque LSAs is novel/unique to
this document.
[...]
Not really, the setting of the E-bit in the Hello packet Options is solely
dependent on the area type. There is nothing about this specific to
opaque LSAs.
Thanks,
Acee
Much thanks,
Lou
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