Re: [spring] I-D Action: draft-previdi-spring-problem-statement-02.txt

Hi Yakov,

see below a comment I forgot to answer...

On Apr 7, 2014, at 12:38 PM, Stefano Previdi (sprevidi) wrote:
> Hi Yakov,
> 
> On Apr 4, 2014, at 10:53 PM, Yakov Rekhter wrote:
>> Stefano,
>> 
>>> All,
>>> 
>>> this is the new version of the problem-statement draft incorporating 
>>> the latest comments.
>> 
>> Section 5.1.1.2 is clearly an improvement over what was in the
>> previous version, although some text is still problematic.
>> Specifically, "C only installs the path via AS2 in its RIB." If it
>> is the Adj-RIB-Out, then C wouldn't be able to advertise the path
>> via AS3 inside AS1 (as this path is not in the Adj-RIB-Out).  And
>> if it is the Loc-RIB, then the Adj-RIB-Out would have only the path
>> via AS2 (as the Adj-RIB-Out is populated from the Loc-RIB), and C
>> would not be able to advertise the path via AS3 inside AS1. Either
>> way, this would contradict the assumption that "C propagates all
>> the paths to Z within AS1 (add-path)."

you're right, the statement that is confusing is "C only installs 
the path via AS2 in its RIB".

Anyway, we have re-phrased the whole section and I'm about to submit 
a new version of the draft.

Thanks.
s.

> I'll address your BGP concerns on a separate thread.
> 
> 
>> You addressed one part of my comments on section 3.
> 
> 
> it's already good to hear/read that ;-)
> 
> 
>> However,
>> the other part of my comments on section 3 is still not addressed.
>> Specifically, section 3 of draft-previdi-spring-problem-statement-02 
>> still contains the following:
>> 
>>  The source-based routing model, applied to the MPLS dataplane, offers
>>  the ability to tunnel services (VPN, VPLS, VPWS) from an ingress PE
>>  to an egress PE, with or without the expression of an explicit path
>>  and without requiring forwarding plane or control plane state in
>>  intermediate nodes.
>> 
>> The above claim about the ability to tunnel services is misleading,
>> as VPN and VPLS services may use p2mp or (in the case of VPN) mp2mp
>> LSPs, and providing any capability for setting up such LSPs is not
>> in the SPRING charter.
>> 
>> With this in mind I propose to replace the above with the following:
>> 
>>  The source-based routing model, applied to the MPLS dataplane, offers
>>  the ability to tunnel services (VPN, VPLS, VPWS) from an ingress PE
>>  to an egress PE, with or without the expression of an explicit path
>>  and without requiring forwarding plane or control plane state in
>>  intermediate nodes, but only if such tunnels are neither p2mp
>>  nor mp2mp tunnels.
> 
> 
> fine by me, I'll incorporate your comments. Thanks.
> 
> s.
> 
> 
> 
>> 
>> Yakov.
>> 
> 
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