Re: [spring] [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions

Wed, 25 Mar 2020 07:50:32 -0700 

Chris,

please see inline:


On 23/03/2020 17:39, Chris Bowers wrote:

Peter,

The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.
1) As discussed in item#3 below, it is not clear that flooding LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is really the right approach.  However, if the WG determines that it is the right approach, the current encodings of this information in the proposed SRv6 SID Structure Sub-Sub-TLV are problematic.  As discussed earlier in this thread, a network operator may choose to not allocate all locators from a single block, so LB Length and LN Length may not be well-defined.
I'm not sure what do you mean by not "well defined". For every SID you need to know the LOC (B+N) part. If you guarantee that it is the same on all nodes, you know it from the local config, otherwise, you advertise it with a SID.
The current encoding of the SRv6 SID Structure Sub-Sub-TLV makes it difficult to represent this situation.  The simple thing to do for nodes that don't have a well-defined value of LB Length and LN Length would be to not advertise a value for LB Length and LN Length.  However, since the currently proposed SRv6 SID Structure Sub-Sub-TLV combines LB Length, LN Length, Fun. Length, and Arg. Length into a single sub-sub-TLV, if a node wants to advertise values for Fun. Length and Arg. Length, it also has to advertise values for LB Length and LN Length.  It seems like a better approach would be to have different sub-sub-TLVs, one for  LB Length and LN Length, and a separate one for Fun. Length and Arg. Length to be able to better represent this situation. 


I'm afraid you are missing an important point.
SRv6 SID is defined as LOC:FUNCT:ARG, where LOC is represented as B:N. To be able to find out where the func and arg are located, you need to know the LOC length, e.g. Block and Node length. Advertising just Func and Arg length does not help.
2) Now consider the situation where a network operator chooses to allocate all locators from a single block, so that LB Length and LN Length are well-defined across the network.  A given node should presumably advertise its own understanding of LB Length and LN Length. A given node's understanding of LB Length and LN Length is a property of the node.  It is not a property of a given End SID.  The currently proposed SRv6 SID Structure Sub-Sub-TLV however is carried within each End SID Sub-TLV.  With the currently proposed encoding, presumably an implementation is expected to send the exact same values of LB Length and LN Length for all of the End SIDs that it advertises.  Not only is this inefficient, but it creates the need for logic to decide what to do when different End SIDs advertised by the same node carry different values of LB Length and LN Length in their sub-sub-TLVs.  It seems like a better approach would be for a given node to advertise its understanding of the value of LB Length and LN Length in a sub-TLV of the Router Capability TLV.
When we design the encoding, we have to define it such, that it supports all possible use cases. We can not design the encoding that works for single use case (allocate all locators from a single block) and does not work for others - different block from different node, multiple blocks on a single node (e.g. border node), which are all valid.
3) At this point, the only use case that has been proposed for flooding the LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is to make it more convenient for BGP-LS to get those values to an external controller as part of a topology feed from any ISIS node. No use case has been proposed for ISIS speakers themselves to make use of the information.  It seems like a more scalable approach would be to use BGP-LS sessions to collect the information from the subset of nodes that actually produce the relevant information.  So far there are no End SIDs defined that are advertised in ISIS that have a non-zero Arg. Length.  If an End SID with non-zero Arg. Length were to be proposed in the future as needing to be flooded to all ISIS nodes, it seems likely that the new End SID would also be advertised using the BGP IP/VPN/EVPN control plane.   So it seems like a viable alternative for this hypothetical future End SID would be to have the subset of nodes that have non-zero Arg. Length values communicate to an external controller via  BGP sessions. I think the WG needs a more detailed discussion of a concrete use case in order to determine whether flooding LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is really the right approach.
there are networks, where BGP is not deployed on all nodes, only on a few nodes that re-distribute the information to BGP-LS. In such case we need the IGP to distribute this data.
Argument that "it seems likely that the new End SID would also be advertised using the BGP IP/VPN/EVPN" is a wishful thinking that we can not based our encoding on.
Given the lack of a compelling use case for flooding LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers and the problems with the currently proposed encodings for doing that, I think that the SRv6 SID Structure Sub-Sub-TLV should be removed from draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers can be defined in a future document. 

The security use case has already been pointed out earlier in this thread:

https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5
Given the arguments I mentioned above, I respectfully disagree with the removal of the SID Structure Sub-Sub-TLV from the ISIS SRv6 draft. 

thanks,
Peter




Thanks,
Chris
On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak <ppse...@cisco.com <mailto:ppse...@cisco.com>> wrote: 

    Hi Chris,

    On 12/03/2020 15:58, Chris Bowers wrote:
     > Peter,
     >
     > I think that the SRv6 SID Structure Sub-Sub-TLV should be removed
    from
     > draft-ietf-lsr-isis-srv6-extensions.  I think that we should
    leave the
     > ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV,
    End.X SID
     > Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those
    sub-TLVs.
     >
     > I don't think that the current text describing the SRv6 SID
    Structure
     > Sub-Sub-TLV would result in interoperable implementations.  Based
    on the

    SRv6 base spec defines SID B, L, A, F.

    SRv6 protocol specs are advertising these values with the SRv6 SID,
    they
    don't use them. The usage is outside of the scope of the protocol
    drafts. What exactly is the problem?

    thanks,
    Peter


     > discussion with Ketan below, it appears that use cases for ISIS
    speakers
     > receiving advertised values of LB Length, LN Length, Fun. Length,
    and
     > Arg. Length are not currently well-defined.    So I think it
    makes sense
     > to defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a
     > future document.
     >
     > Thanks,
     > Chris
     >
     > On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant)
     > <ket...@cisco.com <mailto:ket...@cisco.com>
    <mailto:ket...@cisco.com <mailto:ket...@cisco.com>>> wrote:
     >
     >     Hi Chris,____
     >
     >     __ __
     >
     >     Dropping the draft-ietf-spring-srv6-network-programming authors
     >     since we are now back to discussing the ISIS extensions.____
     >
     >     __ __
     >
     >     Please check inline below.____
     >
     >     __ __
     >
     >     *From:*Chris Bowers <chrisbowers.i...@gmail.com
    <mailto:chrisbowers.i...@gmail.com>
     >     <mailto:chrisbowers.i...@gmail.com
    <mailto:chrisbowers.i...@gmail.com>>>
     >     *Sent:* 05 March 2020 21:53
     >     *To:* Ketan Talaulikar (ketant) <ket...@cisco.com
    <mailto:ket...@cisco.com>
     >     <mailto:ket...@cisco.com <mailto:ket...@cisco.com>>>
     >     *Cc:* Ketan Talaulikar (ketant) <ket...@cisco.com
    <mailto:ket...@cisco.com>
     >     <mailto:ket...@cisco.com <mailto:ket...@cisco.com>>>;
    l...@ietf.org <mailto:l...@ietf.org> <mailto:l...@ietf.org
    <mailto:l...@ietf.org>>;
     >     SPRING WG List <spring@ietf.org <mailto:spring@ietf.org>
    <mailto:spring@ietf.org <mailto:spring@ietf.org>>>;
     >     draft-ietf-spring-srv6-network-programming
     >     <draft-ietf-spring-srv6-network-programm...@ietf.org
    <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org>
     >     <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org
    <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org>>>; Peter
     >     Psenak (ppsenak) <ppse...@cisco.com
    <mailto:ppse...@cisco.com> <mailto:ppse...@cisco.com
    <mailto:ppse...@cisco.com>>>;
     >     Bruno Decraene <bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com>
     >     <mailto:bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com>>>
     >     *Subject:* Re: [Lsr] clarification of locator block and
    locator node
     >     in draft-ietf-spring-srv6-network-programming and
     >     draft-ietf-lsr-isis-srv6-extensions____
     >
     >     __ __
     >
     >     Ketan,____
     >
     >     __ __
     >
     >     See inline [CB].____
     >
     >     __ __
     >
     >     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant)
     >     <ket...@cisco.com <mailto:ket...@cisco.com>
    <mailto:ket...@cisco.com <mailto:ket...@cisco.com>>> wrote:____
     >
     >         Hi Chris,____
     >
     >         ____
     >
     >         You are right in that there is no assumption that all SRv6
     >         locators in a domain are allocated from the same block.
     >         Therefore knowing the blocks used in the domain is
    useful.____
     >
     >     ____
     >
     >     [CB] Since you refer to "blocks" (plural) in this sentence,
    are you
     >     saying that in the scenario where all SRv6 locators in a
    domain are
     >     not allocated from the same block, you would expect different
     >     routers in the same domain to advertise different values of B
    and N?
     >     ____
     >
     >     */[KT] While personally I believe it would not be the usual
    case, it
     >     is left to the operator.____/*
     >
     >     */__ __/*
     >
     >     For example, assume we have a network where all SRv6 locators
    in a
     >     domain are not allocated from the same block.  Router A
    advertises
     >     an SRv6 Locator TLV with locator = 2000::/64, and an SRv6 End SID
     >     sub-TLV with some endpoint behavior. Router B advertises an SRv6
     >     Locator TLV with locator = 3000::/64, and an SRv6 End SID sub-TLV
     >     with some endpoint behavior. What should routers A and B
    advertise
     >     as the values of B and N in their SRv6 SID Structure
    Sub-Sub-TLVs ?____
     >
     >     */[KT] It is difficult for me to figure out what the block
    and node
     >     parts are with such an addressing./*____
     >
     >     ____
     >
     >         ____
     >
     >         The IGP drafts covers the advertisement of the B and N
    parts of
     >         the locally configured locator on the node via IGPs. On the
     >         receiver side, the IGP may not really do much with this
     >         information, however it enables propagation of this
    information
     >         from all nodes in the network to be advertised out via BGP-LS
     >         (or other mechanisms) as part of the topology feed. Once
    this is
     >         part of the topology feed, it enables use-cases on
    controllers
     >         to perform network wide validation of the SRv6 SID block
     >         provisioning and can also help in automation of the security
     >         aspects described in
     >
    
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5____
     >
     >         ____
     >
     >     [CB] If an ISIS speaker is not expected to do anything with B
    and N,
     >     then I think the text in draft-ietf-lsr-isis-srv6-extensions
    needs
     >     to clarify this.  I have a similar observation about Fun.
    Length and
     >     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .  As far
    as I can
     >     tell, none of the endpoint behaviors that are currently
    specified to
     >     be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs
    uses an
     >     Argument, so there is never a case where an SRv6 SID Structure
     >     Sub-Sub-TLV should have a non-zero value for Arg. Length. What
     >     should an ISIS speaker do if it receives a non-zero value of the
     >     Arg. Length for an endpoint behavior that doesn't use an
    argument?
     >     Are there any use cases envisioned where an ISIS speaker needs to
     >     know the Arg. Length ? ____
     >
     >     */[KT] The behaviors currently listed in the draft do not have an
     >     argument nor is the use of B and N required for them. We cannot
     >     preclude a future use-case or extension where such behaviors
     >     introduced are also applicable to ISIS. So IMHO ruling such
    aspects
     >     out might not be the right thing to do from a protocol
    extensibility
     >     perspective.____/*
     >
     >     */__ __/*
     >
     >     */Thanks,____/*
     >
     >     */Ketan/*____
     >
     >     __ __
     >
     >         Thanks,____
     >
     >         Ketan____
     >
     >         ____
     >
     >         *From:*Chris Bowers <chrisbowers.i...@gmail.com
    <mailto:chrisbowers.i...@gmail.com>
     >         <mailto:chrisbowers.i...@gmail.com
    <mailto:chrisbowers.i...@gmail.com>>>
     >         *Sent:* 02 March 2020 23:39
     >         *To:* Ketan Talaulikar (ketant) <ket...@cisco.com
    <mailto:ket...@cisco.com>
     >         <mailto:ket...@cisco.com <mailto:ket...@cisco.com>>>
     >         *Cc:* Ketan Talaulikar (ketant)
     >         <ketant=40cisco....@dmarc.ietf.org
    <mailto:40cisco....@dmarc.ietf.org>
     >         <mailto:40cisco.....@dmarc.ietf.org
    <mailto:40cisco.....@dmarc.ietf.org>>>; l...@ietf.org
    <mailto:l...@ietf.org>
     >         <mailto:l...@ietf.org <mailto:l...@ietf.org>>; SPRING WG
    List <spring@ietf.org <mailto:spring@ietf.org>
     >         <mailto:spring@ietf.org <mailto:spring@ietf.org>>>;
     >         draft-ietf-spring-srv6-network-programming
     >         <draft-ietf-spring-srv6-network-programm...@ietf.org
    <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org>
>  <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org 
    <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org>>>;
     >         Peter Psenak (ppsenak) <ppse...@cisco.com
    <mailto:ppse...@cisco.com>
     >         <mailto:ppse...@cisco.com <mailto:ppse...@cisco.com>>>;
    Bruno Decraene
     >         <bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com> <mailto:bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com>>>
     >         *Subject:* Re: [Lsr] clarification of locator block and
    locator
     >         node in draft-ietf-spring-srv6-network-programming and
     >         draft-ietf-lsr-isis-srv6-extensions____
     >
     >         ____
     >
     >         Ketan,____
     >
     >         ____
     >
     >         Based on current documents, allocating all SRv6 locators
    used in
     >         a domain from a single block is optional.____
     >
     >         ____
     >
     >         However, assuming for the moment that a network operator has
     >         chosen to allocate all SRv6 locators used in a domain from a
     >         single block, so that there is a well-defined value of B
    and N
     >         across a domain, what is the use of having a router advertise
     >         its own understanding of these two values?  And what is a
     >         receiver supposed to do with this information?____
     >
     >         ____
     >
     >         Thanks,____
     >
     >         Chris____
     >
     >         ____
     >
     >         On Fri, Feb 28, 2020 at 8:23 AM
    <bruno.decra...@orange.com <mailto:bruno.decra...@orange.com>
     >         <mailto:bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com>>> wrote:____
     >
     >             Hi Ketan,____
     >
     >             ____
     >
     >             Thanks fort the follow up.____
     >
     >             Clarification inline [Bruno]____
     >
     >             ____
     >
     >             *From**:*Ketan Talaulikar (ketant)
    [mailto:ket...@cisco.com <mailto:ket...@cisco.com>
     >             <mailto:ket...@cisco.com <mailto:ket...@cisco.com>>]
     >             *Sent:* Friday, February 28, 2020 11:11 AM
     >             *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant);
     >             Chris Bowers
     >             *Cc:* l...@ietf.org <mailto:l...@ietf.org>
    <mailto:l...@ietf.org <mailto:l...@ietf.org>>; SPRING WG List;
     >             draft-ietf-spring-srv6-network-programming; Peter Psenak
     >             (ppsenak)
     >             *Subject:* RE: [Lsr] clarification of locator block and
     >             locator node in
    draft-ietf-spring-srv6-network-programming
     >             and draft-ietf-lsr-isis-srv6-extensions____
     >
     >             ____
     >
     >             Hi Bruno,____
     >
     >             ____
     >
     >             I believe the description and usage of Locator is
    very well
     >             described and covered in the net-pgm draft as also the
     >             corresponding IGP extensions. Is the question is more
    about
     >             the “block” part of it (what is not in the block part
    is in
     >             the node part as per the text in the net-pgm draft)?____
     >
     >             ____
     >
     >             The “block” is again not a new thing. Please check the
     >             following:____
     >
     >             Under
     >
    
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5
     >             … look for “block”____
     >
     > https://tools.ietf.org/html/rfc8402#section-2 … look under
     >             SRGB for SRv6____
     >
     >             ____
     >
     >             [Bruno]____
     >
     >             To clarify, my question was not specific to “block” but
     >             related to the usage, by the receiver, of the following
     >             piece of information:____
     >
     >             ____
     >
     >                    LB Length: SRv6 SID Locator Block length____
     >
     >                    LN Length: SRv6 SID Locator Node length____
     >
     >                    Fun. Length: SRv6 SID Function length____
     >
     >                    Arg. Length: SRv6 SID Arguments length____
     >
     >             ____
     >
     >             ____
     >
     >             So perhaps I don’t get Chris’s point and would wait
    for him
     >             to clarify.____
     >
     >             [Bruno] I’ll leave this to Chris.____
     >
     >             ____
     >
     >             Thanks,____
     >
     >             Ketan____
     >
     >             ____
     >
     >             *From:*Lsr <lsr-boun...@ietf.org
    <mailto:lsr-boun...@ietf.org>
     >             <mailto:lsr-boun...@ietf.org
    <mailto:lsr-boun...@ietf.org>>> *On Behalf Of
     >             *bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com> <mailto:bruno.decra...@orange.com
    <mailto:bruno.decra...@orange.com>>
     >             *Sent:* 28 February 2020 14:34
     >             *To:* Ketan Talaulikar (ketant)
     >             <ketant=40cisco....@dmarc.ietf.org
    <mailto:40cisco....@dmarc.ietf.org>
     >             <mailto:40cisco.....@dmarc.ietf.org
    <mailto:40cisco.....@dmarc.ietf.org>>>; Chris Bowers
     >             <chrisbowers.i...@gmail.com
    <mailto:chrisbowers.i...@gmail.com>
    <mailto:chrisbowers.i...@gmail.com <mailto:chrisbowers.i...@gmail.com>>>
     >             *Cc:* l...@ietf.org <mailto:l...@ietf.org>
    <mailto:l...@ietf.org <mailto:l...@ietf.org>>; SPRING WG List
     >             <spring@ietf.org <mailto:spring@ietf.org>
    <mailto:spring@ietf.org <mailto:spring@ietf.org>>>;
     >             draft-ietf-spring-srv6-network-programming
     >             <draft-ietf-spring-srv6-network-programm...@ietf.org
    <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org>
>  <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org 
    <mailto:draft-ietf-spring-srv6-network-programm...@ietf.org>>>;
     >             Peter Psenak (ppsenak) <ppse...@cisco.com
    <mailto:ppse...@cisco.com>
     >             <mailto:ppse...@cisco.com <mailto:ppse...@cisco.com>>>
     >             *Subject:* Re: [Lsr] clarification of locator block and
     >             locator node in
    draft-ietf-spring-srv6-network-programming
     >             and draft-ietf-lsr-isis-srv6-extensions____
     >
     >             ____
     >
     >             Hi Ketan,____
     >
     >             ____
     >
     >             ____
     >
     >             ____
     >
     >             *From:*Lsr [mailto:lsr-boun...@ietf.org
    <mailto:lsr-boun...@ietf.org>] *On Behalf Of
     >             *Ketan Talaulikar (ketant)
     >             *Sent:* Friday, February 28, 2020 6:30 AM____
     >
     >             ____
     >
     >             Hi Chris,____
     >
     >             ____
     >
     >             I agree with Peter and I would suggest to drop LSR since
     >             this is not a protocol specific thing.____
     >
     >             ____
     >
     >             I believe the text in
     >             draft-ietf-spring-srv6-network-programming clears
    says what
     >             locator block and locator node are. What more details
    do you
     >             think are required?____
     >
     >             ____
     >
     >             [Bruno] Speaking as an individual, the draft could
    possibly
     >             clarify the usage of these information/fields by the
     >             receiver. Possibly using the same name/term (e.g.
    SRv6 SID
     >             Locator Block length) to ease the references between both
     >             drafts.____
     >
     >             ____
     >
     >             Thanks,____
     >
     >             --Bruno____
     >
     >             ____
     >
     >             Thanks,____
     >
     >             Ketan____
     >
     >             ____
     >
     >             *From:*Lsr <lsr-boun...@ietf.org
    <mailto:lsr-boun...@ietf.org>
     >             <mailto:lsr-boun...@ietf.org
    <mailto:lsr-boun...@ietf.org>>> *On Behalf Of *Chris Bowers
     >             *Sent:* 27 February 2020 22:46
     >             *To:* l...@ietf.org <mailto:l...@ietf.org>
    <mailto:l...@ietf.org <mailto:l...@ietf.org>>; SPRING WG List
     >             <spring@ietf.org <mailto:spring@ietf.org>
    <mailto:spring@ietf.org <mailto:spring@ietf.org>>>
     >             *Cc:* Peter Psenak (ppsenak) <ppse...@cisco.com
    <mailto:ppse...@cisco.com>
     >             <mailto:ppse...@cisco.com <mailto:ppse...@cisco.com>>>
     >             *Subject:* [Lsr] clarification of locator block and
    locator
     >             node in draft-ietf-spring-srv6-network-programming and
     >             draft-ietf-lsr-isis-srv6-extensions____
     >
     >             ____
     >
     >             SPRING and LSR WGs,____
     >
     >             ____
     >
     >             I think that we need a much more detailed description
    of the
     >             locator block and locator node in either
     >             draft-ietf-spring-srv6-network-programming or
     >             draft-ietf-lsr-isis-srv6-extensions.  See original email
     >             below.____
     >
     >             ____
     >
     >             Thanks,____
     >
     >             Chris____
     >
     >             ____
     >
     >             On Thu, Feb 27, 2020 at 11:08 AM Peter Psenak
     >             <ppse...@cisco.com <mailto:ppse...@cisco.com>
    <mailto:ppse...@cisco.com <mailto:ppse...@cisco.com>>> wrote:____
     >
     >                 Hi Chris,
     >
     >                 On 27/02/2020 17:54, Chris Bowers wrote:
     >                  > LSR WG,
     >                  >
     >                  > Section 9 of
    draft-ietf-lsr-isis-srv6-extensions-05
     >                 defines the  SRv6
     >                  > SID Structure Sub-Sub-TLV. In particular, it
    defines
     >                 encoding for the
     >                  > locator block length and the locator node length.
     >                 The text refers to
     >                  > [I-D.ietf-spring-srv6-network-programming] for the
     >                 definition of these
     >                  > concepts.
     >                  >
     >                  > As far as I can tell, the only reference to
    locator
     >                 block and locator
     >                  > node in
    draft-ietf-spring-srv6-network-programming-10
     >                 is section 3.1
     >                  > which has the following text:
     >                  >
     >                  >     A locator may be represented as B:N where B is
     >                 the SRv6 SID block
     >                  >     (IPv6 subnet allocated for SRv6 SIDs by the
     >                 operator) and N is the
     >                  >     identifier of the parent node
    instantiating the
     >                 SID...
     >                  >
     >                  > I think that we need a much more detailed
    description
     >                 of the locator
     >                  > block and locator node.
     >
     >                 sure, but that would be in the
     >                 draft-ietf-spring-srv6-network-programming-10, not in
     >                 draft-ietf-lsr-isis-srv6-extensions, as these are
    not a
     >                 protocol
     >                 specific constructs.
     >
     >                 thanks,
     >                 Peter
     >
     >                  >
     >                  > Thanks,
     >                  >
     >                  > Chris
     >                  > ____
     >
>  _____________________________________________________________________________________________________________________________ 
     >
     >             ____
     >
     >             Ce message et ses pieces jointes peuvent contenir des
     >             informations confidentielles ou privilegiees et ne
    doivent donc____
     >
     >             pas etre diffuses, exploites ou copies sans
    autorisation. Si
     >             vous avez recu ce message par erreur, veuillez le
    signaler____
     >
     >             a l'expediteur et le detruire ainsi que les pieces
    jointes.
     >             Les messages electroniques etant susceptibles
    d'alteration,____
     >
     >             Orange decline toute responsabilite si ce message a ete
     >             altere, deforme ou falsifie. Merci.____
     >
     >             ____
     >
     >             This message and its attachments may contain
    confidential or
     >             privileged information that may be protected by law;____
     >
     >             they should not be distributed, used or copied without
     >             authorisation.____
     >
     >             If you have received this email in error, please
    notify the
     >             sender and delete this message and its attachments.____
     >
     >             As emails may be altered, Orange is not liable for
    messages
     >             that have been modified, changed or falsified.____
     >
     >             Thank you.____
     >
>  _____________________________________________________________________________________________________________________________ 
     >
     >             ____
     >
     >             Ce message et ses pieces jointes peuvent contenir des
     >             informations confidentielles ou privilegiees et ne
    doivent donc____
     >
     >             pas etre diffuses, exploites ou copies sans
    autorisation. Si
     >             vous avez recu ce message par erreur, veuillez le
    signaler____
     >
     >             a l'expediteur et le detruire ainsi que les pieces
    jointes.
     >             Les messages electroniques etant susceptibles
    d'alteration,____
     >
     >             Orange decline toute responsabilite si ce message a ete
     >             altere, deforme ou falsifie. Merci.____
     >
     >             ____
     >
     >             This message and its attachments may contain
    confidential or
     >             privileged information that may be protected by law;____
     >
     >             they should not be distributed, used or copied without
     >             authorisation.____
     >
     >             If you have received this email in error, please
    notify the
     >             sender and delete this message and its attachments.____
     >
     >             As emails may be altered, Orange is not liable for
    messages
     >             that have been modified, changed or falsified.____
     >
     >             Thank you.____
     >



_______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring

Reply via email to