On 28/03/2023 11:41, Aijun Wang wrote:
There is already overload bit to accomplish the maintenance purposes,
Why do you guys repeat such work again?
OL-bit is only propagated inside the area. We are solving
inter-area/inter-domain routing convergence here.
Peter
Aijun Wang
China Telecom
On Mar 28, 2023, at 18:00, Shraddha Hegde
<shraddha=40juniper....@dmarc.ietf.org> wrote:
Hi Robert,
> Second, if you say this is needed for BGP free deployments then I
question the merit on the basis that UPA is >ephemeral and expires say
in 120 sec which will not be enough for most planned maintenance work.
So if someone >insists to add UP Flag it should be not just a bit but
also a time or time delta from set UTC where it is expected that
>provided prefix will be down,
That is a good point that there should be a max-time associated with
maintenance.
I do not think that this needs to be signaled in IGP. It can be a
local configuration.
Rgds
Shraddha
Juniper Business Use Only
*From:* Lsr <lsr-boun...@ietf.org> *On Behalf Of *Robert Raszuk
*Sent:* Monday, March 27, 2023 1:36 PM
*To:* lsr <lsr@ietf.org>
*Subject:* [Lsr] Interdomain UPA & UP Flag
*[External Email. Be cautious of content]*
Hi,
I would like to get more clarification in respect to
extending External LSAs for UPA. Area summary use case is pretty clear
- but in case of redistribution (typical src of external LSAs) IMO we
are going way too far with this. Let's all keep in mind that this is a
pulse designed to trigger upper protocol switchover.
Needless to say that would work only via one hop by design as
redistribution happens via RIB and by definition of UPA unreachable
routes are not being installed in RIB in the first place.
On the apparently relative terms I do not see a need for the UP Flag.
First planned maintenance should be solved by BGP protocol and there
are already a number of tools in BGP allowing one to do it.
Second, if you say this is needed for BGP free deployments then I
question the merit on the basis that UPA is ephemeral and expires say
in 120 sec which will not be enough for most planned maintenance work.
So if someone insists to add UP Flag it should be not just a bit but
also a time or time delta from set UTC where it is expected that
provided prefix will be down,
Kind regards,
R.
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