Re: [Last-Call] Rtgdir last call review of draft-ietf-mpls-lspping-norao-06

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Hi Dhruv,
thank you for your thoughtful suggestions. I've added more notes below tagged GIM2>>. Attached, please find the updated working version of the draft.

Regards,
Greg


On Tue, Feb 6, 2024 at 7:41 PM Dhruv Dhody <dhruv.ietf@xxxxxxxxx> wrote:
HI Greg,

Thanks for taking my comments into consideration. 

## Major

- It would be incorrect to put RFC 7056 (which is being made historic) in the
"updates:" list at the top of the page. Note that, one needs to follow the
"status-change" document process to mark the RFC as historic which should be
triggered by the AD. The job of this I-D is to articulate the reasons why the
RFC7506 should be made historic. Update section 1 and section 3 accordingly.
Section 3 could list or refer to existing sections on why RFC 7506 should be
historic.
GIM>> Thank you for pointing this out. Updated the header accordingly.  

Dhruv: I think this text in (1) abstract - "It reclassifies RFC 7506 as Historic..." and this text in (2) introduction "...and reclassifies RFC 7506 [RFC7506] as Historic." and section 3 (3) "This document reclassifies RFC 7506 [RFC7506] as Historic." are incorrect. 

It should stay instead that "this document explains why RFC 7560 has been reclassified as Historic" in all places. I would also suggest to update section 3 accordingly
GIM2>> Thank you for explaining the process to me. As I understand it, reclassifying RFC 7506 will take separate efforts and time. Hence my question, "Would it be more acceptable to state, "This document explains why RFC 7506 should be reclassified as Historic"? 

This IESG statement has some useful information - https://www.ietf.org/about/groups/iesg/statements/designating-rfcs-historic

There now exists a new type of document, "status-change" documents, to fill this gap. These documents are kept in the datatracker, are not Internet drafts, and are not published as RFCs, but they are archival documents that are linked to the RFCs whose status is changed


 

- RFC 8029 includes text outside of sections 2.1 and 2.2 that mentions router
alert. For instance, https://datatracker.ietf.org/doc/html/rfc8029#section-4.5
tells how to handle it with "MUST" when we now are asking implementation to
ignore it - ````
   If the Reply Mode in the echo request is "Reply via an
   IPv4 UDP packet with Router Alert", then the IP header MUST contain
   the Router Alert IP Option of value 0x0 [RFC2113] for IPv4 or 69
   [RFC7506] for IPv6.  If the reply is sent over an LSP, the topmost
   label MUST in this case be the Router Alert label (1) (see
   [RFC3032]).
 GIM>> Thank you for catching another reference to the Reply mode 3. Appended the following text to Section 4:
NEW TEXT 
   Resulting from the removal of the Reply mode 3 "Reply via an IPv4/
   IPv6 UDP packet with Router Alert" (see Section 2.2), this
   specification updates Section 4.5 of [RFC8029] by removing the
   following text:

   If the Reply Mode in the echo request is "Reply via an IPv4 UDP
   packet with Router Alert", then the IP header MUST contain the Router
   Alert IP Option of value 0x0 [RFC2113] for IPv4 or 69 [RFC7506] for
   IPv6.  If the reply is sent over an LSP, the topmost label MUST in
   this case be the Router Alert label (1) (see [RFC3032]).


Dhruv: Looks good! 

 
````
- If you do update the text, note that there is an erratum
https://www.rfc-editor.org/errata/eid7639. Please do a check of all other
instances of "alert" as well in RFC 8029.
GIM>> That was my errata. What would be the right way to handle it?  

Dhruv: Since you are removing the text with this update, I guess nothing! 

I have my doubts about one more instance - 


The Router Alert IP Option of value 0x0 [RFC2113] for IPv4 or value 69 [RFC7506] for IPv6 MUST be set in the IP header.
GIM2>> Thank you pointing this text to me. Would the following text address your concern:
NEW TEXT:
   Furthermore, this specidication updates Section 4.3 of [RFC8029] as
   follows:

   OLD:

   The Router Alert IP Option of value 0x0 [RFC2113] for IPv4 or value
   69 [RFC7506] for IPv6 MUST be set in the IP header.

   NEW:

   The Router Alert IP Option of value 0x0 [RFC2113]for IPv4 or value 69
   [RFC7506] for IPv6 MUST be set in the IP header.

   END

Hope you did a check on other instances of "alert" in RFC 8029. 

--

In one edit in Section 4, where you list the OLD text from RFC 8029, do not add a reference to RFC 1122 in OLD text as this should be as listed in RFC 8029. It is good that you added reference in the NEW text! 

Thanks! 
Dhruv



MPLS WG                                                      K. Kompella
Internet-Draft                                                 R. Bonica
Updates: 8029 (if approved)                             Juniper Networks
Intended status: Standards Track                          G. Mirsky, Ed.
Expires: 14 August 2024                                         Ericsson
                                                        11 February 2024


            Deprecating the Use of Router Alert in LSP Ping
                    draft-ietf-mpls-lspping-norao-07

Abstract

   The MPLS echo request and MPLS echo response messages, defined in RFC
   8029 "Detecting Multiprotocol Label Switched (MPLS) Data-Plane
   Failures" (usually referred to as LSP ping messages), are
   encapsulated in IP headers that include a Router Alert Option (RAO).
   The rationale for using an RAO as the exception mechanism is
   questionable.  Furthermore, RFC 6398 identifies security
   vulnerabilities associated with the RAO in non-controlled
   environments, e.g., the case of using the MPLS echo request/reply as
   inter-area Operations, Administration, and Maintenance (OAM), and
   recommends against its use outside of controlled environments.

   Therefore, this document retires the RAO for MPLS OAM and updates RFC
   8029 to remove the RAO from LSP ping message encapsulations.
   Furthermore, this document explains why RFC 7506 has been
   reclassified as Historic.

   This document also recommends the use of an IPv6 loopback address
   (::1/128) and not the use of an IPv4 loopback address mapped to IPv6.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 14 August 2024.



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Copyright Notice

   Copyright (c) 2024 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Router Alert for LSP Ping (RFC 8029)  . . . . . . . . . . . .   3
     2.1.  MPLS Echo Request . . . . . . . . . . . . . . . . . . . .   3
     2.2.  MPLS Echo Reply . . . . . . . . . . . . . . . . . . . . .   4
   3.  Reclassification of RFC 7506 as Historic  . . . . . . . . . .   5
   4.  Update to RFC 8029  . . . . . . . . . . . . . . . . . . . . .   5
   5.  Backwards Compatibility . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   10. Informational References  . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   RFC 8029 - "Detecting Multiprotocol Label Switched (MPLS) Data-Plane
   Failures" (usually referred to as LSP Ping) [RFC8029] detects data-
   plane failures in MPLS Label Switched Paths (LSPs).  It can operate
   in "ping mode" or "traceroute mode".  When operating in ping mode, it
   checks LSP connectivity.  When operating in traceroute mode, it can
   trace an LSP and localize failures to a particular node along an LSP.

   The reader is assumed be familiar with [RFC8029] and its terminology.

   LSP ping defines a probe message called the "MPLS echo request".  It
   also defines a response message called the "MPLS echo reply".  Both
   messages are encapsulated in UDP and IP.  The MPLS echo request
   message is further encapsulated in an MPLS label stack, except when
   all of the Forwarding Equivalency Classes in the stack correspond to
   Implicit Null labels.



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   When operating in ping mode, LSP ping sends a single MPLS echo
   request message, with the MPLS TTL set to 255.  This message is
   intended to reach the egress Label Switching Router (LSR).  When
   operating in traceroute mode, MPLS ping sends multiple MPLS echo
   request messages as defined in Section 4.3 of [RFC8029].  It
   manipulates the MPLS TTL so that the first message expires on the
   first LSR along the path and subsequent messages expire on subsequent
   LSRs.

   According to [RFC8029], the IP header that encapsulates an MPLS echo
   request message must include a Router Alert Option (RAO).
   Furthermore, [RFC8029] also says that the IP header that encapsulates
   an MPLS echo reply message must include an RAO if the value of the
   Reply Mode in the corresponding MPLS echo request message is "Reply
   via an IPv4/IPv6 UDP packet with Router Alert".  In both cases, the
   rationale for including an RAO is questionable.  Furthermore,
   [RFC6398] identifies security vulnerabilities associated with the RAO
   in non-controlled environments, e.g., the case of using the MPLS echo
   request/reply as inter-domain OAM over the public Internet, and
   recommends against its use outside of controlled environments, e.g.,
   outside a single administrative domain.

   Therefore, this document updates RFC 8029 [RFC8029] to retire the RAO
   from both LSP ping message encapsulations and explains why RFC 7506
   [RFC7506] has been reclassified as Historic.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  Router Alert for LSP Ping (RFC 8029)

2.1.  MPLS Echo Request

   While the MPLS echo request message must traverse every node in the
   LSP under test, it must not traverse any other node.  Specifically,
   the message must not be forwarded beyond the egress Label Switching
   Router (LSR).  To achieve this, a set of the mechanisms that are used
   concurrently to prevent leaking MPLS echo request messages has been
   defined in [RFC8029]:







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   1.  When the MPLS echo request message is encapsulated in IPv4, the
       IPv4 destination address must be chosen from the subnet 127/8.
       When the MPLS echo request message is encapsulated in IPv6, the
       IPv6 destination address must be chosen from the subnet
       0:0:0:0:0:FFFF:7F00:0/104.

   2.  When the MPLS echo request message is encapsulated in IPv4, the
       IPv4 TTL must be equal to 1.  When the MPLS echo request message
       is encapsulated in IPv6, the IPv6 Hop Limit must be equal to 1.
       For further information on the encoding of the TTL/Hop Limit in
       an MPLS echo request message, see Section 4.3 of [RFC8029].

   3.  When the MPLS echo request message is encapsulated in IPv4, the
       IPv4 header must include an RAO with the option value set to
       "Router shall examine packet" [RFC2113].  When the MPLS echo
       request message is encapsulated in IPv6, the IPv6 header chain
       must include a Hop-by-hop extension header and the Hop-by-hop
       extension header must include an RAO with the option value set to
       MPLS OAM [RFC7506].

   Currently, all of these are required.  However, any one is sufficient
   to prevent forwarding the packet beyond the egress LSR.

   Therefore, this document changes RFC 8029 [RFC8029] in that
   Requirement 3 is removed.

   No implementation that relies on the RAO to prevent packets from
   being forwarded beyond the egress LSR have been reported to the MPLS
   working group.

2.2.  MPLS Echo Reply

   An LSP ping replies to the MPLS echo request message with an MPLS
   echo reply message.  Four reply modes are defined in [RFC8029]:

   1.  Do not reply

   2.  Reply via an IPv4/IPv6 UDP packet

   3.  Reply via an IPv4/IPv6 UDP packet with Router Alert

   4.  Reply via application-level control channel

   The rationale for mode 3 is questionable, if not wholly misguided.
   According to RFC 8029 [RFC8029], "If the normal IP return path is
   deemed unreliable, one may use 3 (Reply via an IPv4/IPv6 UDP packet
   with Router Alert)."




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   However, it is not clear that the use of the RAO increases the
   reliability of the return path.  In fact, one can argue it decreases
   the reliability in many instances, due to the additional burden of
   processing the RAO.  This document changes RFC 8029 [RFC8029] in that
   mode 3 is removed.

   No implementations of mode 3 have been reported to the MPLS working
   group.


3.  Reclassification of RFC 7506 as Historic

   RFC 7506 [RFC7506] defines the IPv6 Router Alert Option for MPLS
   Operations, Administration, and Management.  This document explains
   why RFC 7506 [RFC7506] has been reclassified as Historic.

4.  Update to RFC 8029

   [RFC8029] requires that the IPv6 Destination Address used in IP/UDP
   encapsulation of an MPLS echo request packet is selected from the
   IPv4 loopback address range mapped to IPv6.  Such packets do not have
   the same behavior as prescribed in [RFC1122] for an IPv4 loopback
   addressed packet.

   [RFC4291] defines ::1/128 as the single IPv6 loopback address.
   Considering that, this specification updates Section 2.1 of [RFC8029]
   regarding the selection of an IPv6 destination address for an MPLS
   echo request message as follows:

   OLD

   The 127/8 range for IPv4 and that same range embedded in an
   IPv4-mapped IPv6 address for IPv6 was chosen for a number of reasons.

   RFC 1122 [RFC1122] allocates the 127/8 as the "Internal host loopback
   address" and states: "Addresses of this form MUST NOT appear outside
   a host."  Thus, the default behavior of hosts is to discard such
   packets.  This helps to ensure that if a diagnostic packet is
   misdirected to a host, it will be silently discarded.

   RFC 1812 [RFC1812] states:

   *  A router SHOULD NOT forward, except over a loopback interface, any
      packet that has a destination address on network 127.  A router
      MAY have a switch that allows the network manager to disable these
      checks.  If such a switch is provided, it MUST default to
      performing the checks.




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   This helps to ensure that diagnostic packets are never IP forwarded.

   The 127/8 address range provides 16M addresses allowing wide
   flexibility in varying addresses to exercise ECMP paths.  Finally, as
   an implementation optimization, the 127/8 range provides an easy
   means of identifying possible LSP packets.

   NEW

   The 127/8 range for IPv4 was chosen for a number of reasons.

   RFC 1122 [RFC1122] allocates the 127/8 as the "Internal host loopback
   address" and states: "Addresses of this form MUST NOT appear outside
   a host."  Thus, the default behavior of hosts is to discard such
   packets.  This helps to ensure that if a diagnostic packet is
   misdirected to a host, it will be silently discarded.

   RFC 1812 [RFC1812] states:

   *  A router SHOULD NOT forward, except over a loopback interface, any
      packet that has a destination address on network 127.  A router
      MAY have a switch that allows the network manager to disable these
      checks.  If such a switch is provided, it MUST default to
      performing the checks.

   This helps to ensure that diagnostic packets are never IP forwarded.

   The 127/8 address range provides 16M addresses allowing wide
   flexibility in varying addresses to exercise ECMP paths.  Finally, as
   an implementation optimization, the 127/8 range provides an easy
   means of identifying possible LSP packets.

   The IPv6 destination address for an MPLS echo request message is
   selected as follows:

   *  For IPv6, the IPv6 loopback address ::1/128 SHOULD be used.

   *  The sender of an MPLS echo request MAY select the IPv6 destination
      address from the 0:0:0:0:0:FFFF:7F00/104 range.

   *  To exercise all paths in an ECMP environment, the entropy other
      than the IP destination address SHOULD be used.

   END

   Additionally, this specification updates Section 2.2 of [RFC8029] to
   replace the whole of the section with the following text:




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   LSP Ping implementations SHOULD ignore RAO options when they arrive
   on incoming MPLS echo request and MPLS echo reply messages.

   Resulting from the removal of the Reply mode 3 "Reply via an IPv4/
   IPv6 UDP packet with Router Alert" (see Section 2.2), this
   specification updates Section 4.5 of [RFC8029] by removing the
   following text:

   If the Reply Mode in the echo request is "Reply via an IPv4 UDP
   packet with Router Alert", then the IP header MUST contain the Router
   Alert IP Option of value 0x0 [RFC2113] for IPv4 or 69 [RFC7506] for
   IPv6.  If the reply is sent over an LSP, the topmost label MUST in
   this case be the Router Alert label (1) (see [RFC3032]).

   Furthermore, this specidication updates Section 4.3 of [RFC8029] as
   follows:

   OLD:

   The Router Alert IP Option of value 0x0 [RFC2113] for IPv4 or value
   69 [RFC7506] for IPv6 MUST be set in the IP header.

   NEW:

   The Router Alert IP Option of value 0x0 [RFC2113]for IPv4 or value 69
   [RFC7506] for IPv6 MUST be set in the IP header.

   END

5.  Backwards Compatibility

   LSP Ping implementations that conform to this specification SHOULD
   ignore RAO options when they arrive on incoming MPLS echo request and
   MPLS echo reply messages.  However, this will not harm backwards
   compatibility because other mechanisms will also be in use by all
   legacy implementations in the messages they send and receive.

   Section 6 of this document deprecates the IPv6 RAO value for MPLS OAM
   (69) in [IANA-IPV6-RAO] and the Reply Mode 3 ("Reply via an IPv4/IPv6
   UDP packet with Router Alert") in [IANA-LSP-PING].

   [RFC8126] offers a formal description of the word "Deprecated".  In
   this context, "Deprecated" means that the deprecated values SHOULD
   NOT be used in new implementations, and that deployed implementations
   that already use these values continue to work seamlessly.






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6.  IANA Considerations

   IANA is requested to mark the IPv6 RAO value of MPLS OAM (69) in
   [IANA-IPV6-RAO] as "Deprecated".

   IANA is also requested to mark Reply Mode 3 ("Reply via an IPv4/IPv6
   UDP packet with Router Alert") in "Multiprotocol Label Switching
   (MPLS) Label Switched Paths (LSPs) Ping Parameters"[IANA-LSP-PING] as
   "Deprecated".

7.  Security Considerations

   The recommendations this document makes do not compromise security.
   In case of using IPv6 loopback address ::1/128 strengthens security
   for LSP Ping by using the standardized loopback address with well-
   defined behavior.

8.  Acknowledgments

   The authors express their appreciation to Adrian Farrel and Gyan
   Mishra for for their suggestions that improved the readability of the
   document.

9.  Normative References

   [RFC1122]  Braden, R., Ed., "Requirements for Internet Hosts -
              Communication Layers", STD 3, RFC 1122,
              DOI 10.17487/RFC1122, October 1989,
              <https://www.rfc-editor.org/info/rfc1122>.

   [RFC1812]  Baker, F., Ed., "Requirements for IP Version 4 Routers",
              RFC 1812, DOI 10.17487/RFC1812, June 1995,
              <https://www.rfc-editor.org/info/rfc1812>.

   [RFC2113]  Katz, D., "IP Router Alert Option", RFC 2113,
              DOI 10.17487/RFC2113, February 1997,
              <https://www.rfc-editor.org/info/rfc2113>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC4291]  Hinden, R. and S. Deering, "IP Version 6 Addressing
              Architecture", RFC 4291, DOI 10.17487/RFC4291, February
              2006, <https://www.rfc-editor.org/info/rfc4291>.





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   [RFC6398]  Le Faucheur, F., Ed., "IP Router Alert Considerations and
              Usage", BCP 168, RFC 6398, DOI 10.17487/RFC6398, October
              2011, <https://www.rfc-editor.org/info/rfc6398>.

   [RFC7506]  Raza, K., Akiya, N., and C. Pignataro, "IPv6 Router Alert
              Option for MPLS Operations, Administration, and
              Maintenance (OAM)", RFC 7506, DOI 10.17487/RFC7506, April
              2015, <https://www.rfc-editor.org/info/rfc7506>.

   [RFC8029]  Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N.,
              Aldrin, S., and M. Chen, "Detecting Multiprotocol Label
              Switched (MPLS) Data-Plane Failures", RFC 8029,
              DOI 10.17487/RFC8029, March 2017,
              <https://www.rfc-editor.org/info/rfc8029>.

   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

10.  Informational References

   [IANA-IPV6-RAO]
              IANA, "IPv6 Router Alert Option Values", n.d.,
              <https://www.iana.org/assignments/ipv6-routeralert-
              values>.

   [IANA-LSP-PING]
              IANA, "Multiprotocol Label Switching (MPLS) Label Switched
              Paths (LSPs) Ping Parameters", n.d.,
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters.xml>.

Authors' Addresses

   Kireeti Kompella
   Juniper Networks
   1133 Innovation Way
   Sunnyvale, CA 94089
   United States
   Email: kireeti.ietf@xxxxxxxxx






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   Ron Bonica
   Juniper Networks
   1133 Innovation Way
   Sunnyvale, CA 94089
   United States
   Email: rbonica@xxxxxxxxxxx


   Greg Mirsky (editor)
   Ericsson
   Email: gregimirsky@xxxxxxxxx








































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