Re: [OSPF] Extensions to OSPF for Advertising Optional Router Capabilities

Hi Abhay,

Abhay D.S wrote:
>
> hi acee, and other neighbors in the AS,
>
>   5.  Flooding Scope of the Router Information LSA
>
>   The flooding scope for a Router Information LSA is determined by the
>   LSA type.  For OSPFv2, type 9 (link-scoped), type 10 (area-scoped),
>   or a type 11 (AS-scoped) opaque LSA may be flooded.  For OSPFv3, the
>   S1 and S2 bits in the LSA type determine flooding scope.  If AS wide
>   flooding scope is chosen, the originating router should also
>   advertise area scoped LSA(s) into any attached NSSA area(s).  An OSPF
>   router MAY advertise different capabilities when both NSSA area
>   scoped LSA(s) and an AS scoped LSA are advertised.  This allows
>   functional capabilities to be limited in scope.  For example, a
>   router may be an area border router but only support traffic
>   engineering (TE) in a subset of its attached areas.
>
>   *The choice of flooding scope is made by the advertising router and is
>   a matter of local policy.
>   *This specification, takes OSPFv2 to new levels of  intelligence.
>   Flooding scope MAY  also be policed. Such as only a subset of 
> capabilities to be
>   advertised  from capability subset in each scope.
>
>   Such as when a router becomes ASBR, ABR or just an Internal Area 
> Router, GR capable
>   Overloaded, busy for example (if you receive a busy bit) (add to 
> capability set ?). Busy and Free
>   capability  might be used by CSPF. ( You might have just edited the 
> new specification for the TE Addresses
>   for all OSPF interfaces). You might read the relation.
>
>   You might want to add a section, IMPACT:   Where in you might add 
> the impact
>    Action: Router shall perform only those actions upon reception of 
> these capability information
Since the draft defines a generic mechanism for advertising router 
capabilities and
the action an OSPF router would take is specific to a capability, I 
don't think this is
necessary. Note that all the bits in the OSPF Router Informational 
Capabilities TLV
are informational and no explicit action is necessary.

Thanks,
Acee
>
>   Any comments ,
>   - Abhay
>  
>
>
>  
>  
>  
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