as0 is subject to announce/withdraw problem

some text reduction and clarification

draft-ietf-sidrops-8210bis.xml

@@ -8,7 +8,7 @@
 <?rfc compact="yes"?>
 <?rfc subcompact="no"?>
 
-<rfc category="std" docName="draft-ietf-sidrops-8210bis-19"
+<rfc category="std" docName="draft-ietf-sidrops-8210bis-20"
      submissionType="IETF" ipr="trust200902" version="2" consensus="yes">
 
   <front>
@@ -21,13 +21,6 @@
     <author fullname="Randy Bush" initials="R." surname="Bush">
       <organization>Arrcus, DRL, &amp; IIJ Research</organization>
       <address>
-        <postal>
-          <street>5147 Crystal Springs</street>
-          <city>Bainbridge Island</city>
-          <region>Washington</region>
-          <code>98110</code>
-          <country>United States of America</country>
-        </postal>
         <email>randy@psg.com</email>
       </address>
     </author>
@@ -1748,8 +1741,7 @@ Cache                         Router
 
   <section anchor="races" title="ROA PDU Race Minimization">
     <t>
-      When a cache is sending ROA (IPv4 or IPv6) PDUs to a router,
+      When a cache is sending ROA (IPv4 or IPv6) PDUs to a router
-      especially an initial full load in response to a Reset Query PDU,
       undesirable race conditions are possible:
       <list style="hanging">
 	<t hangText="Make Before Break:">
@@ -1759,25 +1751,26 @@ Cache                         Router
 	  "make before break."  If a cache is feeding a router and sends
 	  the one not yet in service a significant time before sending
 	  the one currently in service, then BGP data could be marked
-	  invalid during the interval.  To minimize that interval, the
+	  Invalid during the interval.  To minimize that interval, the
-	  cache SHOULD announce all VRPs for the same prefix as close to
+	  cache SHOULD semd all VRPs for the same prefix as close to
-	  sequentially as possible, and announce new VRPs for a prefix
+	  sequentially as possible.
-	  before any withdraws,
 	</t>
-	<t hangText="Shorter Prefix First:">
+	<t hangText="Longest Prefix Match:">
-	  If an operator has created a ROA for P0, and another operator
+	  If an operator has created a ROA for prefix P0, and another
-	  (likely their customer) has issued a ROA for P1 which is a
+	  operator (often their customer) has created a ROA for P1 which
-	  sub-prefix of P0, a router which receives the ROA for P0
+	  is a sub-prefix covered by P0, a router which receives the ROA
-	  before that for P1 is likely to mark a BGP announcement of
+	  for P0 before that for P1 might mark BGP for prefix P1 Invalid
-	  prefix P1 invalid.  Therefore, the cache SHOULD announce the
+	  until the P1 announcement is processed.  Therefore, the cache
-	  sub-prefix P1 before the covering prefix P0.  Conversely, in
+	  SHOULD announce the sub-prefix P1 before the covering prefix
-	  the case of withdrawals, the cache SHOULD withdraw covering
+	  P0.  Conversely, the cache SHOULD withdraw covering prefixes
-	  prefixes before their sub-prefixes.
+	  before covered sub-prefixes.
 	</t>
-	<t hangText="AS 0 Last:">
+	<t hangText="AS 0:">
 	  To minimize risk of inadvertent marking of BGP data as
-	  invalid, a prefix PDU for prefix P which has an AS of 0,
+	  Invalid, an announcement VRP for prefix P which has an AS of
-	  SHOULD be sent after all other prefix PDUs for prefix P.
+	  0, SHOULD be sent after all other prefix PDUs for prefix P.
+	  Conversely, a withdrawal VRP for prefix P which has an AS of
+	  0, SHOULD be sent before all other prefix PDUs for prefix P.
 	</t>
       </list>
       <t>
@@ -1807,14 +1800,15 @@ Cache                         Router
 	PDUs are first ordered by PDU Type,
       </t>
       <t>
-	IPv4 and IPv6 Prefix PDUs are ordered by: first IPvX Prefix,
+	IPv4 and IPv6 Prefix VRPs are ordered by: first IPvX Prefix,
 	second Prefix Length, third Max Length, and fourth Autonomous
-	System Number.  Treating AS 0 as sorting last fulfills the "AS 0
+	System Number.  Treating announcements of VPUs with AS 0 as
-	Last" requirement of <xref target="races"/>,
+	sorting last, and withdrawals as sorting first, fulfills the "AS
+	0" requirement of <xref target="races"/>,
       </t>
       <t>
-	Router Keys are ordered by AS Number and then Subject Public Key
+	Router Key PDUs are ordered by AS Number and then Subject Public
-	Info,
+	Key Info,
       </t>
       <t>
 	And ASPA PDUs ordered by Customer AS.