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Hi Bruno,

Thanks for your comments. I can agree your some statement with spring co= -chair hat on. I would like to propose the definition of draft-ietf-isis-se= gment-routing-extensions-05:

1. "2.1.  Prefix Segment Identifier (Prefix-SID Sub-TLV)

         V-Flag: Value flag.&nbs= p; If set, then the Prefix-SID carries a
         value (instead of an index= ).  By default the flag is UNSET.
         L-Flag: Local Flag.  = If set, then the value/index carried by
         the Prefix-SID has local s= ignificance.  By default the flag is
         UNSET.

 

      SID/Index/Label: according to the V and L= flags, it contains
      either:
      * 

         A 4 octet index definin= g the offset in the SID/Label space
         advertised by this router = using the encodings defined in
         Section 3.1.  In this= case the V and L flags MUST be unset.

         A 3 octet local label w= here the 20 rightmost bits are used for
         encoding the label value.&= nbsp; In this case the V and L flags MUST
         be set"

 

Regarding these definition, since the combination of V-Flag and L-F= lag should have four types. But now it only defines two types. If V-Flag is= SET and L-Flag is UNSET, what should be contained

in SID/Index/Label? If with co-author of the draft hat on, can you help = explain? Or will you define definitely in the draft that this case MUST NOT= happen?

In addition, I learn some implementation can directly use Prefix-SID Sub= -TLV to advertise the domain-wide label value directly instead of using you= r proposed "global segments uses global index +

local labels (aka SRGB)". I= f this case happens, what should we say? Is it that the implementation is t= otally wrong or the implementation can also be accepted or it is an

special case that = the domain-wide label happens to be = the same as the "global segments uses global index &= #43; local labels (aka SRG= B)"?

 

Best Regards,

Zhenbin(Robin)

 


 

 

 

=B7=A2=BC=FE=C8=CB: bruno.decraene@orange.com [bruno.decraen= e@orange.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA11=D4=C24=C8=D5 14:26
=CA=D5=BC=FE=C8=CB: Lizhenbin
=B3=AD=CB=CD: mpls@ietf.org; John G. Scudder
=D6=F7=CC=E2: RE: Solicit Opinions on Definition of MPLS Global Labe= l

Hi Robin,

 

Since I did not get the cha= nce to express my comment during the meeting, I=A1=AFll do over email.

 

<s= pring co-chair hat on>

SPRING/SR:

- is compliant with the MPL= S architecture (RFC 3031)

   &nb= sp;          - in particular, in the control plane l= abels are locally allocated and in the forwarding plane, labels (of global = segments) are SWAPed

- does NOT need global/doma= in wide label

   &nb= sp;            - local segments uses local labels

   &nb= sp;            - global segments uses global index = 3; local labels (aka SRGB)

- is not requesting the MPL= S WG to work on global/domain wide label. (i.e= . the debate is closed from the SPRING standpoint.). Obviously, the MPLS WG is free to re-open the debate, but this is not a sp= ring thing.

</spring co-chair hat on= >

 

Based on this, some of your= slides referring to =A1=B0SR uses cases=A1=B1 seem a bit misleading. (I ca= n=A1=AFt be more specific since during the meeting, I could see the slides but could not comment, and now I can comment but can= =A1=AFt see the slides as they are not online).

 

Thanks

-- Bruno

 

From: mpls [mailto:mpls-bounces@ietf.org] On Beh= alf Of Lizhenbin
Sent: Wednesday, November 04, 2015 2:27 PM
To: mpls@ietf.org
Subject: [mpls] Solicit Opinions on Definition of MPLS Global Label<= /span>

 

Hi MPLSers,

As the development of MPLS technologies, many new label concepts = beyond RFC3031 are proposed. And in segment routing MPLS label can be

allocated and flooded in the network which means the meaning of t= he lablel can be understood by all nodes in the network. It is totally diff= erent from

the label distribution behavior of LDP, RSVP-TE, and MP-BGP. From= my point of view we need not argue if it is global label or global ID. In = fact, the

possible persons who read the drafts of protocol extensions for s= egment routing which incorporate the label allocation may be confused that = MPLS WG as

the base of MPLS work seems to have nothing with the work. But th= e challenge of definition of global label truly exists which has been propo= sed in the draft

https://www.ietf.org/id/draft-li-mpls-globa= l-label-usecases-03.txt. Hope you can refer to Section 4 of the draft.

The debates on MPLS global label have lasted for a long time. The= opinions can be classified as following:

Opinion 1: Segment Routing has nothing with global label and plea= se do not make it bother MPLS WG. But it seems a little hard to convin= ce some MPLSers.

Opinion 2: The usecase truly exists. But the concept of global la= bel is too big. It is hard to allocate a label which is unique spanning mul= tiple domains or

as IP address which is unique all over world since it is not a sc= alable way or it is hard to achieve the goal. Then maybe it is a better way= to narrow the

scope to rename the global label as Domain-wide label, Network-wi= de label, etc.

Opinion 3: The global label can be kept to cover more label conce= pts which label behaviors in the control plane and forward plane are d= ifferent form the

traditional LDP/RSVP-TE/MP-BGP.

 

Since I could not get more time in my presentation to c= ollect your opinions, if convenient please help feedback your opinion in yo= ur mailing list. Hope through

the discussion we can make some consensus.

 

 

 

Best Regards,

Zhenbin(Robin)

 

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