Some comments on draft-dimitri-ccamp-gmpls-ason-routing-ospf-00.txt

["Dean Cheng \(dcheng\)" <dcheng@cisco.com>]

Dimitri,

 

I've some comments now as follows:

 

1) The third paragraph of section 6.1, it says, "....However, an

    additional restriction MUST be applied such that the RC

    selection process takes into account that an upper level may

    be adjacent to one or more lower levels."

 

    It would be good to clarify the words "one or more lower levels"

    here. From the sentence after that, it actually means one or

    more areas at the lower levels.

 

2) In section 6.1, it says that the D bit is used together with the

   "Associated Area ID" sub-tlv, as "an additional restriction". In

    the same section, it does not mention the use of that sub-tlv

    along with U bit.

 

   But in section 6.2.1 and 6.2.2, it explicitly says that the "Associated

   Area ID" sub-tlv is included when re-originating the opaque LSA

   downward or upward.

 

   It would require clarification and consistency here.

 

3) In section 6.1 (Discovery and Selection), it describes a method

    for "selecting" the RC that performs the upward/downward dissemination

    of routing information.

 

    What happens if RC1 is currently the RC that doing the upward advertising

    but RC2 just becomes active with U-bit set and a higher Router ID ?

 

    I guess the same handling as OSPF DR's election can be used for

    stability purpose, and also for consistency, and if so, needs to be stated

    in this section. And for that matter, the word "selection" vs. "election"

    does not really make much difference.

 

4) In section 7.2, it is also useful to add that the number of levels be under

    policy control.

 

5) It would be useful to add an interoperability section, which describes how

    an traditional OSPF node/network interoperates (if need to) with an OSPF

    node/network with extensions as described in this ID. E.g., a reachable

    address (prefix) is advertised by an ABR normally but with this ID, can also

    be advertised through hierarchy.

 

Thanks

Dean