Re: [Idr] BGP Attribute for Large communities (Attribute 30) was squatted on - Let's get a new attribute number (1 week WG call (10/18 to 10/25)

t.petch <ietfc@btconnect.com> Wed, 19 October 2016 17:03 UTC

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From: t.petch <ietfc@btconnect.com>
To: "John G. Scudder" <jgs@juniper.net>, Nick Hilliard <nick@foobar.org>
References: <01f401d22950$7f988470$7ec98d50$@ndzh.com> <5806484F.5080006@foobar.org> <DAFB5E44-8319-4A4B-8751-4E4CC0F1AE20@juniper.net>
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Cc: IETF IDR WG <idr@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] BGP Attribute for Large communities (Attribute 30) was squatted on - Let's get a new attribute number (1 week WG call (10/18 to 10/25)
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----- Original Message -----
From: "John G. Scudder" <jgs@juniper.net>;
Sent: Tuesday, October 18, 2016 5:35 PM

> On Oct 18, 2016, at 12:05 PM, Nick Hilliard <nick@foobar.org>; wrote:
> > unless this is a temporary deprecation,
>
> All deprecation is temporary. It means "you shouldn't use this, and by
the way we might reuse it for something in the future" where "in the
future" probably/usually means "when we run out of unused space" (modulo
my earlier remark to Jeff). Deprecation is therefore the first step in
reusing a code point.
>
> I looked for a supporting citation and didn't find one, though. :-(

Mmm so RFCs

3879 Deprecating Site Local Addresses

4159 Deprecation of "ip6.int".

5095 Deprecation of Type 0 Routing Headers in IPv6.

6633 Deprecation of ICMP Source Quench Messages.

6649 Deprecate DES, RC4-HMAC-EXP, and Other Weak Cryptographic
Algorithms  in Kerberos

6814 Formally Deprecating Some IPv4 Options.

6918 Formally Deprecating Some ICMPv4 Message Types.

6938 Deprecation of BGP Path Attributes: DPA, ADVERTISER, and RCID_PATH
/CLUSTER_ID

7447 Deprecation of BGP Entropy Label Capability Attribute

7526 Deprecating the Anycast Prefix for 6to4 Relay Routers.

7568 Deprecating Secure Sockets Layer Version 3.0.

are all temporary and we should look forward their resurrection in
future; source quench from site local with SSL3 protection via the 6to4
anycast:-)

I note that RFC5226 does not mention the term while RFC5226bis has
' "deprecated" (use is not recommended). '

But then RFC7120 has

' The WG chairs are responsible for informing IANA
   that the expired assignments are not required and that the code
   points are to be marked "deprecated".

   A deprecated code point is not marked as allocated for use as
   described in any document (that is, it is not allocated) and is not
   available for allocation in a future document.  The WG chairs may
   inform IANA that a deprecated code point can be completely
   de-allocated (i.e., made available for new allocations) at any time
   after it has been deprecated'

So I think that deprecation is permanent until you say otherwise so I
guess that makes you right!

Tom Petch

> --John
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