Re: effect of deprecated site local addresses on router renumbering (rfc 2894)

[Elwyn Davies <[e-mail]>]

Suraj wrote:

>Hi All,
>
>RFC 2894 ' Router Renumbering for IPv6'describes the Renumbering of
>Prefixes using RR commands to multicast addresses. (Site local OR Link
>local).
>
>Since the site local addresses are now deprecated (RFC 3879), we can
>assume that RR is now supported only for Link local addresses (unicast
>and multicast).
>  
>
No:  The deprecation only affects site-local unicast addresses.  
Site-scope multicast is still available.

>What is the relevance of the 'S'(site specific) flag now in the command
>message. Should the 'S' flag be evaluated even if the scope of
>destination address is Link local (unicast or multicast)?
>  
>
Yes:  The relevance is unchanged.  If a router is at a site border and 
is configured with some interfaces (set A) associated with one site and 
others (set B)  associated with other site(s), then a renumbering 
message arriving on any interface in set A (whatever the destination 
address in the base IPv6 header) with the S flag set will be applied 
exclusively to the interfaces in set A - those in set B will be unaffected.

>Since RFC 2894 says that the 'S' flag should be ignored unless the
>router treats interfaces as belonging to different "sites", in this case
>should the RR command messages be limited only to the interfaces on that
>link OR to all interfaces on the router?
>  
>
Again the type of the command message destination address has no effect. 
Combining the words in s1, s3.1 and s4.3, the intention is that any RR 
command with the S flag clear applies to *all* interfaces apart from 
those that might be ruled out because they are currently shut down 
depending on the setting of the A flag - nothing is said about altering 
the processing depending on the type of destination address.

Regards,
Elwyn

>Thanks and Regards,
>Suraj.
>
>
>
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