Hi all, 

We’ve submitted a draft for the extensions of VA-auto mechanism, below is 
the link:
http://tools.ietf.org/id/draft-cheng-grow-va-auto-extensions-00.txt 

This draft specifies VA auto-configuration extension operation, which 
includes the following 
two aspects: 

1. VP routes are tagged specifically with a “should-install tag”. 
Consequently, in the 
scenario where all VP routes for a given VP are withdrawn, routers 
(include tagging routers 
and non-tagging routers) could detect the withdrawn VP immediately, and 
then implement the 
proper operation. 

2. A popular prefixes list is configured on the tagging routers.  This 
list could be consisted 
of high volume prefixes, policy-based prefixes and static list prefixes. 
Customer prefixes 
mentioned in exiting mechanism could be considered as one kind of 
policy-based prefixes. Tagging 
routers should not tag routes whose prefix falls within this list. 

Your thoughts and comments are welcome. 

Best regards 
Li Cheng
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