Re: Last Call: draft-manner-router-alert-iana (IANA Considerations for the IPv4 and IPv6 Router Alert Option) to Proposed Standard

Jukka,

> Both registries will use 32 values for the aggregation levels. For 
> IPv6 RAO, value 3 is removed but value 35 is kept. Thus, IPv6 will 
> have values 4-35 (=32 values) for the 32 levels.

OK

> We can make this more clear, yet, I already answered a question from 
> IANA about this a couple of weeks ago, so they are aware of how the 
> registry should be changed.
Which is good, but I was hoping the RFC itself would also be clear on 
this. How about this:

OLD:
   | 3        | Aggregated Reservation  | Aggregated Reservation       |
   |          | Nesting Level 3         | Nesting Level 0 [RFC3175]    |
   |          | [RFC3175]               |                              |
NEW:
   | 3        | Aggregated Reservation  | Aggregated Reservation       |
   |          | Nesting Level 3         | Nesting Level 0 [RFC3175](*) |
   |          | [RFC3175]               |                              |

OLD:
   Note (*): The entry in the above table for the IPv6 RAO Value of 35
   (Aggregated Reservation Nesting Level 32) has been marked due to an
   inconsistency in the text of [RFC3175], and that is consequently
   reflected in the IANA registry.  In that document the values 3-35
   (i.e. 33 values) are defined for nesting levels 0-31 (i.e. 32
   levels).

   It is unclear why nesting levels begin at 1 for IPv4 (described in
   section 1.4.9 of [RFC3175]) and 0 for IPv6 (allocated in section 6 of
   [RFC3175]).
NEW:
   Note (*): The entry in the above table for the IPv6 RAO Value of 35
   (Aggregated Reservation Nesting Level 32) has been marked due to an
   inconsistency in the text of [RFC3175], and that is consequently
   reflected in the IANA registry.  In that document the values 3-35
   (i.e. 33 values) are defined for nesting levels 0-31 (i.e. 32
   levels). Similarly, value 3 is duplicate, because aggregation
   level 0 means end-to-end signaling, and this already has an IPv6
   RAO value "1" assigned.

   Also note that nesting levels begin at 1 for IPv4 (described in
   section 1.4.9 of [RFC3175]) and 0 for IPv6 (allocated in section 6 of
   [RFC3175]).

   Section 3.2 of this document redefines these so that for IPv6,
   value 3 is no longer used and values 4-35 represent levels
   1-32. This removes the above inconsistencies.

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