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PROPOSED STANDARD

Network Working Group                                           L. Blunk
Request for Comments: 4012                                 Merit Network
Updates: 2725, 2622                                             J. Damas
Category: Standards Track                    Internet Systems Consortium
                                                               F. Parent
                                                                  Hexago
                                                          A. Robachevsky
                                                                RIPE NCC
                                                              March 2005


     Routing Policy Specification Language next generation (RPSLng)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This memo introduces a new set of simple extensions to the Routing
   Policy Specification Language (RPSL), enabling the language to
   document routing policies for the IPv6 and multicast address families
   currently used in the Internet.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Specifying routing policy for different address families . . .  2
       2.1.  Ambiguity Resolution . . . . . . . . . . . . . . . . . .  3
       2.2.  The afi dictionary attribute . . . . . . . . . . . . . .  3
       2.3.  RPSL dictionary extensions . . . . . . . . . . . . . . .  4
       2.4.  IPv6 RPSL types  . . . . . . . . . . . . . . . . . . . .  4
       2.5.  mp-import, mp-export, and mp-default . . . . . . . . . .  4
             2.5.1.  <mp-peering> . . . . . . . . . . . . . . . . . .  6
             2.5.2.  <mp-filter>  . . . . . . . . . . . . . . . . . .  6
             2.5.3.  Policy examples  . . . . . . . . . . . . . . . .  7
   3.  route6 Class . . . . . . . . . . . . . . . . . . . . . . . . .  7
   4.  Updates to existing Classes to support the extensions  . . . .  8
       4.1.  as-set Class . . . . . . . . . . . . . . . . . . . . . .  8
       4.2.  route-set Class  . . . . . . . . . . . . . . . . . . . .  9



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       4.3.  filter-set Class . . . . . . . . . . . . . . . . . . . .  9
       4.4.  peering-set Class  . . . . . . . . . . . . . . . . . . .  9
       4.5.  inet-rtr Class . . . . . . . . . . . . . . . . . . . . . 10
       4.6.  rtr-set Class  . . . . . . . . . . . . . . . . . . . . . 11
   5.  RFC 2725 Extensions  . . . . . . . . . . . . . . . . . . . . . 11
       5.1.  Authorization model for route6 Objects . . . . . . . . . 13
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 14
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
       8.1.  Normative References . . . . . . . . . . . . . . . . . . 14
       8.2.  Informative References . . . . . . . . . . . . . . . . . 14
       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 15
       Full Copyright Statement . . . . . . . . . . . . . . . . . . . 16

1.  Introduction

   RFC 2622 [1] defines the RPSL language for the IPv4 unicast routing
   protocols and provides a series of guidelines for extending the RPSL
   language itself.  Additionally, security extensions to the RPSL
   language are specified in RFC 2725 [2].

   This document proposes to extend RPSL according to the following
   goals and requirements:

   o  Provide RPSL extensibility in the dimension of address families,
      specifically, to allow users to document routing policy for IPv6
      and multicast.
   o  Extensions should be backward compatible with minimal impact on
      existing tools and processes, following Section 10 of RFC 2622 [1]
      for guidelines on extending RPSL.
   o  Maintain clarity and non-ambiguity: RPSL information is used by
      humans in addition to software tools.
   o  Minimize duplication of information, particularly when routing
      policies for different address families are the same.

   The addition of IPv6 and multicast support to RPSL leads to four
   distinct routing policies that need to be distinguished in this
   specification, namely, (IPv4 {unicast|multicast}, IPv6
   {unicast|multicast}).

2.  Specifying Routing Policy for Different Address Families

   Routing policy is currently specified in the aut-num class using
   "import:", "export:", and "default:" attributes.  Sometimes it is
   important to distinguish policy for different address families, as
   well as a unicast routing policy from a multicast one.





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   Although the syntax of the existing import, export, and default
   attributes could be extended, this would present backward
   compatibility issues and could undermine clarity in the expressions.

   Keeping this in mind, the "import:", "export:", and "default:"
   attributes implicitly specify IPv4 unicast policy and will remain as
   previously defined in RPSL, and new multi-protocol (prefixed with the
   string "mp-") attributes will be introduced.  These new "mp-"
   attributes are described below.

2.1.   Ambiguity Resolution

   The same peering can be covered by more than one multi-protocol
   policy attribute or by a combination of multi-protocol policy
   attributes (when specifying IPv4 unicast policy) and the previously
   defined IPv4 unicast policy attributes.  In these cases,
   implementations should follow the specification-order rule as defined
   in Section 6.4 of RFC 2622 [1].  To break the ambiguity, the action
   corresponding to the first peering specification is used.

2.2.  The afi Dictionary Attribute

   This section introduces a new dictionary attribute:

   Address Family Identifier, <afi>, is an RPSL list of address families
   for which a given routing policy expression should be evaluated.
   <afi> is optional within the new multi-protocol attributes introduced
   in the aut-num class.  A pseudo identifier named "any" is defined to
   allow for more compact policy expressions with converged routing
   policy.

   The possible values for <afi> are as follows:

      ipv4.unicast
      ipv4.multicast
      ipv4 (equivalent to ipv4.unicast, ipv4.multicast)
      ipv6.unicast
      ipv6.multicast
      ipv6 (equivalent to ipv6.unicast, ipv6.multicast)
      any (equivalent to ipv4, ipv6)
      any.unicast (equivalent to ipv4.unicast, ipv6.unicast)
      any.multicast (equivalent to ipv4.multicast, ipv6.multicast)

   Appearance of these values in an attribute must be preceded by the
   keyword afi.

   An <afi-list> is defined as a comma-separated list of one or more afi
   values.



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2.3.  RPSL Dictionary Extensions

   In order to support IPv6 addresses specified with the next-hop rp-
   attribute, a new predefined dictionary type entitled "ipv6_address"
   is added to the RPSL dictionary.  The definition of this type is
   taken from Section 2.2 of RFC 3513 [3].

   The next-hop rp-attribute is expanded in the dictionary as follows:

   rp-attribute: # next hop router in a static route
                 next-hop
                 operator=(union ipv4_address, ipv6_address, enum[self])

   A new value has been added for the <protocol> dictionary
   specification:
      MPBGP

   MPBGP is understood to be BGP4 with multi-protocol extensions (often
   referred to as BGP4+).  BGP4+ could not be used, as the '+' character
   is not allowed by the RPSL specification in protocol names.

2.4.  IPv6 RPSL Types

   This document will reference three new IPv6 RPSL types, namely,
   <ipv6-address>, <ipv6-address-prefix>, and <ipv6-address-prefix-
   range>.  The <ipv6-address> and <ipv6-address-prefix> types are
   defined in Sections 2.2 and 2.3 of RFC 3513 [3].  The <ipv6-address-
   prefix-range> type adds a range operator to the <ipv6-address-prefix>
   type.  The range operator is defined in Section 2 of RFC 2622 [1].

2.5.  mp-import, mp-export, and mp-default

   Three new policy attributes are introduced in the aut-num Class:

      mp-import:
      mp-export:
      mp-default:

   These attributes incorporate the afi (address-family) specification.
   Note that the afi specification is optional.  If no afi specification
   is present, the policy expression is presumed to apply to all
   protocol families, namely, ipv4.unicast, ipv4.multicast,
   ipv6.unicast, and ipv6.multicast.  This is the equivalent of the afi
   specification "afi any".  The mp-import and mp-export attributes have
   both a basic policy specification and a more powerful structured
   policy specification.





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   The syntax for the mp-default attribute and the basic policy
   specification of the mp-import and mp-export attributes is as
   follows:

   Attribute  Value                                         Type
   mp-import  [protocol <protocol-1>] [into <protocol-2>]   optional,
              [afi <afi-list>]                              multi-valued
              from <mp-peering-1> [action <action-1>; ... <action-N>;]
              . . .
              from <mp-peering-M> [action <action-1>; ... <action-N>;]
              accept <mp-filter> [;]

   mp-export  [protocol <protocol-1>] [into <protocol-2>]   optional,
              [afi <afi-list>]                              multi-valued
              to <mp-peering-1> [action <action-1>; ... <action-N>;]
              . . .
              to <mp-peering-M> [action <action-1>; ... <action-N>;]
              announce <mp-filter> [;]

   mp-default [afi <afi-list>] to <mp-peering>              optional,
              [action <action-1>; ... <action-N>;]          multi-valued
              [networks <mp-filter>]

   The mp-import and mp-export policies can be structured.  As with RFC
   2622 [1], structured policies are recommended only to advanced RPSL
   users.  The mp-import structured policy syntax is defined below.
   Please note the semicolon at the end of an <import-factor> is
   mandatory for structured policy expressions, while being optional on
   non-structured policy expressions.  The mp-export structured policy
   syntax is expressed symmetrically to the mp-import attribute.  The
   structured syntax allows exceptions and refinements to policies by
   use of the "except" and "refine" keywords.  Further, the exceptions
   and refinements may specify an optional "afi" list to restrict the
   policy expression to particular address families.

   Note that the definition allows subsequent or "cascading" refinements
   and exceptions.  RFC 2622 [1] incorrectly refers to these as "nested"
   expressions.  The syntax does not allow true nested expressions.

   <import-factor> ::=
        from <mp-peering-1> [action <action-1>; ... <action-M>;]
        . . .
        from <mp-peering-N> [action <action-1>; ... <action-K>;]
        accept <mp-filter>;

   <import-term> :: = import-factor |
        {
        <import-factor-1>



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        . . .
        <import-factor-N>
        }

   <import-expression> ::= <import-term> |
        <import-term> EXCEPT <afi-import-expression> |
        <import-term> REFINE <afi-import-expression>

   <afi-import-expression> ::= [afi <afi-list>] <import-expression>

   mp-import: [protocol <protocol-1>] [into <protocol-2>]
        <afi-import-expression>

2.5.1.  <mp-peering>

   <mp-peering> indicates the AS (and the router if present) and is
   defined as follows:

   <mp-peering> ::= <as-expression> [<mp-router-expression-1>]
                    [at <mp-router-expression-2>] | <peering-set-name>

   where <as-expression> is an expression over AS numbers and AS sets
   using operators AND, OR, and EXCEPT, and <mp-router-expression> is an
   expression over router ipv4-addresses or ipv6-addresses, inet-rtr
   names, and rtr-set names using operators AND, OR, and EXCEPT.  The
   binary "EXCEPT" operator is the set subtraction operator and has the
   same precedence as the operator AND (it is semantically equivalent to
   "AND NOT" combination).  That is, "(AS65001 OR AS65002) EXCEPT
   AS65002" equals "AS65001".

2.5.2.  <mp-filter>

   The <mp-filter> policy filter expression is derived from the RPSL
   <filter> policy filter expression defined in section 5.4 of RFC 2622
   [1].  <mp-filter> extends the <filter> expression to allow the
   specification of IPv6 prefixes and prefix ranges.  In particular, an
   Address-Prefix Set expression in an <mp-filter> expression may
   include both IPv4 and IPv6 prefixes or prefix ranges.  <mp-filter> is
   otherwise identical to the RPSL <filter> expression.  Address-Prefix
   Sets are enclosed in braces, '{' and '}'.  The policy filter matches
   the set of routes whose destination address-prefix is in the set.
   For example:

      { 192.0.2.0/24, 2001:0DB8::/32 }
      { 2001:0DB8:0100::/48^+, 2001:0DB8:0200::/48^64 }






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2.5.3.  Policy Examples

   The address family may be specified in subsequent refine or except
   policy expressions and is valid only within the policy expression
   that contains it.

   Therefore, in the example

   aut-num:    AS65534
   mp-import: afi any.unicast from AS65001 accept as-foo;
                except afi any.unicast {
                  from AS65002 accept AS65226;
                } except afi ipv6.unicast {
                    from AS65003 accept {2001:0DB8::/32};
                  }

   the last "except" is evaluated only for the IPv6 unicast address
   family, while other import-expressions are evaluated for both the
   IPv6 and IPv4 unicast address families.

   The evaluation of a policy expression is done by evaluating each of
   its components.  Evaluation of peering-sets and filter-sets is
   constrained by the address family.  Such constraints may result in a
   "NOT ANY" <mp-filter> or invalid <mp-peering> depending on implicit
   or explicit definitions of the address family in the set.  Conflicts
   with explicit or implicit declarations are resolved at runtime during
   the evaluation of a policy expression.  An RPSL evaluation
   implementation may wish to issue a warning in the case of a "NOT ANY"
   <mp-filter>.  The following mp-import policy contains an example of
   an <mp-filter> that should be evaluated as "NOT ANY":

   aut-num: AS65002
   mp-import: afi ipv6.unicast from AS65001 accept {192.0.2.0/24}

3.  route6 Class

   The route6 class is the IPv6 equivalent of the route class.  As with
   the route class, the class key for the route6 class is specified by
   the route6 and origin attribute pair.  Other than the route6
   attribute, the route6 class shares the same attribute names with the
   route class.  Although the attribute names remain identical, the
   inject, components, exports-comps, holes, and mnt-routes attributes
   must specify IPv6 prefixes and addresses rather than IPv4 prefixes
   and addresses.  This requirement is reflected by the specification of
   <ipv6-router-expression>, <ipv6-filter>, and <ipv6-address-prefix>
   below.  <ipv6-address-prefix> has been previously defined.  <ipv6-
   filter> is related to <mp-filter> as defined above in Section 2.5.2,
   with the exception that only <ipv6-address-prefix> types are



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   permitted.  Similarly, <ipv6-router-expression> is related to
   <mp-router-expression> as defined above in Section 2.5.1 with the
   exception that only <ipv6-address> types are permitted.

Attribute     Value                             Type
route6        <ipv6-address-prefix>             mandatory, class key,
                                                single-valued
origin        <as-number>                       mandatory, class key,
                                                single-valued
member-of     list of <route-set-name>          optional, multi-valued
inject        [at <ipv6-router-expression>] ... optional, multi-valued
              [action <action>]
              [upon <condition>]
components    [ATOMIC] [[<ipv6-filter>]         optional, single-valued
              [protocol <protocol> <ipv6-filter> ...]]
aggr-bndry    <as-expression>                   optional, single-valued
aggr-mtd      inbound or outbound               optional, single-valued
              [<as-expression>]
export-comps  <ipv6-filter>                     optional, single-valued
holes         list of <ipv6-address-prefix>     optional, multi-valued
mnt-lower     list of <mntner-name>             optional, multi-valued
mnt-routes    list of <mntner-name>             optional, multi-valued
              [{list of <ipv6-address-prefix-range>} or ANY]

   Example:

   route6:   2001:0DB8::/32
   origin:   AS65001

4.  Updates to Existing Classes to Support the Extensions

4.1.  as-set Class

   The as-set class defines a set of Autonomous Systems (AS), specified
   either directly by listing them in the members attribute or
   indirectly by referring to another as-set or using the mbrs-by-ref
   facility.  More importantly, "In a context that expects a route set
   (e.g., members attribute of the route-set class), [...] an as-set
   AS-X defines the set of routes that are originated by the ASes in
   AS-X", (section 5.3 of  RFC 2622 [1]).

   The as-set class is therefore used to collect a set of route
   prefixes, which may be restricted to a specific address family.

   The existing as-set class does not need any modifications.  The
   evaluation of the class must be filtered to obtain prefixes belonging
   to a particular address family using the traditional filtering
   mechanism in use in Internet Routing Registry (IRR) systems today.



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4.2.  route-set Class

   This class is used to specify a set of route prefixes.

   A new attribute "mp-members:" is defined for this class.  This
   attribute allows the specification of IPv4 or IPv6
   address-prefix-ranges.

Attribute   Value                                 Type
mp-members  list of (<ipv4-address-prefix-range>  optional, multi-valued
            or <ipv6-address-prefix-range>
            or <route-set-name>
            or <route-set-name><range-operator>)

Example:

route-set:  rs-foo
mp-members: rs-bar
mp-members: 2001:0DB8::/32  # v6 member
mp-members: 192.0.2.0/24   # v4 member

4.3.  filter-set Class

   The new "mp-filter:" attribute defines the set's policy filter.  A
   policy filter is a logical expression that when applied to a set of
   routes returns a subset of these routes.  The relevant parts of the
   updated filter-set class are shown below:

   Attribute   Value                Type
   filter-set  <object-name>        mandatory, single-valued, class key
   filter      <filter>             optional, single-valued
   mp-filter   <mp-filter>          optional, single-valued

   Where <mp-filter> is defined above in Section 2.5.2.  While the
   "filter:" and "mp-filter:" attributes are of type "optional", a
   filter-set must contain one of these two attributes.  Implementations
   should reject instances where both attributes are defined in an
   object, as the interpretation of such a filter-set is undefined.

4.4.  peering-set Class

   The peering set class is updated with a "mp-peering:" attribute.

   Attribute    Value               Type
   peering-set  <object-name>       mandatory, single-valued, class key
   peering      <peering>           optional, multi-valued
   mp-peering   <mp-peering>        optional, multi-valued




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   Example:

   peering-set:   prng-ebgp-peers
   mp-peering:    AS65002 2001:0DB8::1 at 2001:0DB8::2

   With <mp-peering> defined as above in Section 2.5.1.  While the
   "peering:" and "mp-peering:" attributes are of type "optional", a
   peering-set must contain at least one of these two attributes.

4.5.  inet-rtr Class

   Two new attributes are introduced to the inet-rtr class --
   "interface:", which allows the definition of generic interfaces,
   including the information previously contained in the "ifaddr:"
   attribute, as well as support for tunnel definitions;  and "mp-
   peer:", which includes and extends the functionality of the existing
   "peer:" attribute.  The syntax definition for the "interface:"
   attribute follows:

   Attribute  Value                               Type
   interface  <ipv4-address> or <ipv6-address>    optional, multi-valued
              masklen <mask>
              [action <action>]
              [tunnel <remote-endpoint-address>,<encapsulation>]

   The syntax allows native IPv4 and IPv6 interface definitions, as well
   as the definition of tunnels as virtual interfaces.  Without the
   optional tunnel definition, this attribute allows the same
   functionality as the "ifaddr:" attribute but extends it to allow IPv6
   addresses.

   If the interface is a tunnel, the syntax is as follows:

   <remote-endpoint-address> indicates the IPv4 or IPv6 address of the
   remote endpoint of the tunnel.  The address family must match that of
   the local endpoint.  <encapsulation> denotes the encapsulation used
   in the tunnel and is one of {GRE,IPinIP} (note that the outer and
   inner IP protocol versions can be deduced from the interface context
   -- for example, IPv6-in-IPv4 encapsulation is just IPinIP).  Routing
   policies for these routers should be described in the appropriate
   classes (e.g., aut-num).

   The "mp-peer:" attribute is defined below.  The difference between
   this attribute and the "peer:" attribute is the inclusion of support
   for IPv6 addresses.






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   Attribute  Value                                     Type
   mp-peer    <protocol> <ipv4-address> <options>  or   optional,
              <protocol> <ipv6-address> <options>  or   multi-valued
              <protocol> <inet-rtr-name> <options> or
              <protocol> <rtr-set-name> <options>  or
              <protocol> <peering-set-name> <options>

   where <protocol> is a protocol name, and <options> is a
   comma-separated list of peering options for <protocol>, as provided
   in the RPSL dictionary.

4.6.  rtr-set Class

   The rtr-set class is extended with a new attribute, "mp-members:".
   This attribute extends the original "members:" attribute by allowing
   the specification of IPv6 addresses.  It is defined as follows:

   Attribute   Value                             Type
   mp-members  list of (<inet-rtr-name> or       optional, multi-valued
               <rtr-set-name> or
               <ipv4-address> or
               <ipv6-address>)

5.  RFC 2725 Extensions

   RFC 2725 [2] introduces an authorization model to address the
   integrity of policy expressed in routing registries.  Two new
   attributes were defined to support this authorization model: the
   "mnt-routes" and "mnt-lower" attributes.

   In RPSLng, these attributes are extended to the route6 and inet6num
   (described below) classes.  Further, the syntax of the existing mnt-
   routes attribute is modified to allow the optional specification of
   IPv6 prefix range lists when present in inet6num, route6, and aut-num
   class objects.  This optional list of prefix ranges is a comma-
   separated list enclosed in curly braces.  In the aut-num class, the
   IPv6 prefix ranges may be mixed with IPv4 prefix ranges.  The keyword
   "ANY" may also be used instead of prefix ranges.  In the case of
   inet6num and route6 objects, "ANY" refers to all more specifics of
   the prefix in the class key field.  For the aut-num class, "ANY"
   literally means any prefix.  The default when no additional set items
   are specified is "ANY".  An abbreviated definition of the aut-num
   class with the updated syntax for the mnt-routes attribute is
   presented below.







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Attribute     Value                             Type
aut-num       <as-number>                       mandatory, class key,
                                                single-valued
mnt-routes    list of <mntner-name>             optional, multi-valued
              [{list of (<ipv6-address-prefix-range> or
                         <ipv4-address-prefix-range>)} or ANY]

   The following is an example of mnt-routes usage.  This example
   authorizes MAINT-65001 to create route6 objects with an origin AS of
   65002 for IPv6 address prefixes within the 2001:0DB8::/32^+ range,
   and route objects with origin AS 65002 for IPv4 prefixes within the
   192.0.2.0/24^+ range.

   aut-num: AS65002
   mnt-routes: MAINT-AS65001 {2001:0DB8::/32^+, 192.0.2.0/24^+}

   Note, that the inclusion of IPv6 prefix ranges within a mnt-routes
   attribute in an aut-num object may conflict with existing
   implementations of RPSL that support only IPv4 prefix ranges.
   However, given the perceived lack of implementation of this optional
   prefix range list, it was considered more acceptable to extend the
   existing definition of the mnt-routes attribute in the aut-num class
   rather than to create a new attribute type.

   Attribute     Value                    Type
   inet6num      <ipv6-address-prefix>    mandatory, single-valued,
                                          class key
   netname       <netname>                mandatory, single-valued
   descr         <free-form>              mandatory, multi-valued
   country       <country-code>           mandatory, multi-valued
   admin-c       <nic-handle>             mandatory, multi-valued
   tech-c        <nic-handle>             mandatory, multi-valued
   remarks       <free-form>              optional, multi-valued
   notify        <email-address>          optional, multi-valued
   mnt-lower     list of <mntner-name>    optional, multi-valued
   mnt-routes    list of <mntner-name>    optional, multi-valued
                 [{list of <ipv6-address-prefix-range>} or ANY]
   mnt-by        list of <mntner-name>    mandatory, multi-valued
   changed       <email-address> <date>   mandatory, multi-valued
   source        <registry-name>          mandatory, single-valued

   The <country-code> must be a valid two-letter ISO 3166 country code
   identifier.  <netname> is a symbolic name for the specified IPv6
   address space.  It does not have a restriction on RPSL reserved
   prefixes.  These definitions are taken from the RIPE Database
   Reference Manual [4].





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5.1.  Authorization Model for route6 Objects

   Deletion and update of a route6 object is not different from other
   objects, as defined in RFC 2725 [2].  Creation rules of a route6
   object is replicated here from the corresponding rules for route
   object in RFC 2725 [2] section 9.9.

   When a route6 object is added, the submission must satisfy two
   authentication criteria.  It must match the authentication specified
   in the aut-num object and that specified in either a route6 object
   or, if no applicable route6 object is found, an inet6num object.

   An addition is submitted with an AS number and IPv6 prefix as its
   key.  If the aut-num object does not exist on a route6 to add, then
   the addition is rejected.  If the aut-num exists, then the submission
   is checked against the applicable maintainers.  A search is then done
   for the prefix, looking first for an exact match and then, failing
   that,  for the longest prefix match less specific than the prefix
   specified.  If this search succeeds, it will return one or more
   route6 objects.  The submission must match an applicable maintainer
   in at least one of these route6 objects for the addition to succeed.
   If the search for a route6 object fails, then a search is performed
   for an inet6num object that exactly matches the prefix, or for the
   most specific inet6num less specific than the route6 object
   submission.

   Once the aut-num and either a list of route6 objects or an inet6num
   is found, the authorization is taken from these objects.  The
   applicable maintainer object is any referenced by the mnt-routes
   attributes.  If one or more mnt-routes attributes are present in an
   object, the mnt-by or mnt-lower attributes are not considered.  In
   the absence of a mnt-routes attribute in a given object, the first
   mnt-lower attributes are used (only if the given object is an
   inet6num object and it is less specific than the route6 object to be
   added).  If no applicable mnt-lower attribute is found, then the
   mnt-by attributes are used for that object.  The authentication must
   match one of the authorizations in each of the two objects.

6.  Security Considerations

   This document describes extensions to RFC 2622 [1] and RFC 2725 [2].
   The extensions address the limitations of the aforementioned
   documents with respect to IPv6 and multicast.  The extensions do not
   introduce any new security functionality or threats.







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   Although the extensions introduce no additional security threats, it
   should be noted that the original RFC 2622 [1] RPSL standard included
   several weak and/or vulnerable authentication mechanisms:  first, the
   "MAIL-FROM" scheme, which can be easily defeated via source email
   address spoofing;  second, the "CRYPT-PW" scheme, which is subject to
   dictionary attacks and password sniffing if RPSL objects are
   submitted via unencrypted channels such as email;  and, finally, the
   "NONE" mechanism, which offers no protection for objects.

7.  Acknowledgements

   The authors wish to thank all the people who have contributed to this
   document through numerous discussions, particularly Ekaterina
   Petrusha, for highly valuable discussions and suggestions:  Shane
   Kerr, Engin Gunduz, Marc Blanchet, and David Kessens who participated
   constructively in many discussions and Cengiz Alaettinoglu, who is
   still the reference in all things RPSL.

8.  References

8.1.  Normative References

   [1]  Alaettinoglu, C., Villamizar, C., Gerich, E., Kessens, D.,
        Meyer, D., Bates, T., Karrenberg, D., and M. Terpstra, "Routing
        Policy Specification Language (RPSL)", RFC 2622, June 1999.

   [2]  Villamizar, C., Alaettinoglu, C., Meyer, D., and S. Murphy,
        "Routing Policy System Security", RFC 2725, December 1999.

   [3]  Hinden, R. and S. Deering, "Internet Protocol Version 6 (IPv6)
        Addressing Architecture", RFC 3513, April 2003.

8.2.  Informative References

   [4]  Damas, J. and A. Robachevsky, "RIPE Database Reference Manual",
        August 2002.















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Authors' Addresses

   Larry Blunk
   Merit Network

   EMail: ljb@merit.edu


   Joao Damas
   Internet Systems Consortium

   EMail: Joao_Damas@isc.org


   Florent Parent
   Hexago

   EMail: Florent.Parent@hexago.com


   Andrei Robachevsky
   RIPE NCC

   EMail: andrei@ripe.net



























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Full Copyright Statement

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