The MPLS WG Archive

[Francois Le Faucheur <flefauch@cisco.com>]

Grenville,

At 19:16 28/06/2000 -0700, Grenville Armitage wrote:
>Francois,
>
>I'm gradually getting time to continue our discussion of
>my other points. In this email, my suggestion #9:
>
>Francois Le Faucheur wrote:
>	[..]
>> >#9 Preconfigured E-LSP EXP<->PHB mapping?
>> >
>> >   Section 3.2.1 talks about a preconfigured EXP<->PHB mapping
>> >   but does not suggest a default. I think the document ought to
>> >   specify an actual default for EXP 000 to map to Best Effort PHB
>> >   (or set of defaults where *all* EXP values map to BE).
>> >
>> 
>> The Network Adminsitrator is expected to configure the
>> "preconfigured EXP<->PHB mapping" depending on the BAs that
>> are actually used in his/her network. Since differenet Network
>> Administrators are likely to run differnet subsets of BAs it is
>> difficult to define a Default mapping that would be generally
>> useful.
>
>Agreed, generally useful non-BE mappings would be hard to
>get WG agreement on.
>
>> But I guess you are saying , it would be useful to have
>> a default mapping in case the preconfigured mapping hasn't been
>> configured at all by the Network Adminsitrator. Right?
>
>Yes. I contemplated suggesting a set of eight BAs, but
>didn't want to open up a can of worms regarding which
>eight BAs are important enough to mandate that an LSR
>support. So....
>
>> In that case, I suppose I woudl also map all EXP values
>> towards BE.
>
>Yes, I think it would be beneficial for the text to at least
>nominate the default behavior for every EXP value (or at least
>EXP=000) to be Best Effort. Although such a default is kind
>of intuitive, its worth stating. The text can easily reassure
>readers that local configuration is always entitled to override
>the default.
>

makes sense to me. unless someone raises issues with this, we will add that default mapping.
thanks

Francois

>cheers,
>gja
>________________________________________________________________________
>Grenville Armitage                    http://members.home.net/garmitage/
>Bell Labs Research Silicon Valley
> 
_________________________________________________________________
Francois Le Faucheur   
Development Engineer, IOS Layer 3 Services 
Cisco Systems 
Office Phone:   	+33 4 92 96 75 64
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Email:          	flefauch@cisco.com
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