Filter-Based RIB Information Model
draft-kini-i2rs-fb-rib-info-model-03

I2RS working group                                               S. Kini
Internet-Draft                                                  Ericsson
Intended status: Standards Track                                S. Hares
Expires: January 7, 2016                                       L. Dunbar
                                                                  Huawei
                                                             A. Ghanwani
                                                             R. Krishnan
                                                                    Dell
                                                           D. Bogdanovic
                                                        Juniper Networks
                                                             J. Tantsura
                                                                R. White
                                                                Ericsson
                                                            July 6, 2015


                   Filter-Based RIB Information Model
                  draft-kini-i2rs-fb-rib-info-model-01

Abstract

   This document defines an information model and a data model for the
   I2RS Filter-based Routing Information Base (RIB) Yang model.  A
   routing system uses the Filter-based RIBto program FIB entries that
   process incoming packets by matching on multiple fields within the
   packet and then performing a specified action on it.  The FB-RIB can
   also specify an action to forward the packet according to the FIB
   entries programmed using the RIBs of its routing instance.

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 http://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 January 7, 2016.






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Copyright Notice

   Copyright (c) 2015 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
   (http://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 Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions and Acronyms  . . . . . . . . . . . . . . . . . .   4
   3.  Filter-Based-RIB module . . . . . . . . . . . . . . . . . . .   5
     3.1.  FB-RIB entries  . . . . . . . . . . . . . . . . . . . . .   7
     3.2.  Relationship between RB-RIB Rule Model and RIB
           Information Model . . . . . . . . . . . . . . . . . . . .   9
   4.  yang models . . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.1.  Filter-Based RIB types  . . . . . . . . . . . . . . . . .   9
     4.2.  fb-fib yang module  . . . . . . . . . . . . . . . . . . .  12
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  Normative References: . . . . . . . . . . . . . . . . . .  15
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   The Interface to the Routing System (I2RS)
   [I-D.ietf-i2rs-architecture] architecture provides dynamic read and
   write access to the information and state within the routing
   elements.  The I2RS client interacts with the I2RS agent in one or
   more network routing systems.

   This document provides a yang module for the I2RS filter Based
   Routing Information Base (FB-RIB) and describes the I2RS interaction
   with routing filters within a routing element.

   Filter-based routing is a technique used to make packet forwarding
   decisions based on a filter that is matched to the incoming packets
   and the specified action.  It should be noted that that this is



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   distinct from the static routes in the RIB
   [I-D.ietf-i2rs-rib-info-model] where the routing is destination
   address based.  A Filter-based RIB entry specifies matches on fields
   in a packet (which may include layer 2 fields, IP header fields,
   transport or application fields) or size of the packet or interface
   received on.  The matches are contained in an ordered list of filters
   which contain pairs of match condition-action (aka event-condition-
   action).

   (Note: Filter-based RIBs (FB-RIBs) operate only on the interface the
   FB-RIB are configured on.)

   If all matches fail, default action is to forward the packet using
   FIB entries that were programmed by the Routing Informational Base
   (RIB) manager described in [I-D.ietf-i2rs-rib-info-model].

   Actions in the condition-action pair may impact forwarding or set
   something in the packet that will impact forwarding.  Policy actions
   are typically applied before applying QoS constraints since policy
   actions may override QoS constraint.

   The Filter-Based RIB resides in ephemeral state as does the I2RS RIB
   and I2RS topology models.

   A Filter-Based RIB (Routing Information Base) is contained in a
   routing instance (defined in [I-D.ietf-i2rs-rib-info-model]).  It
   contains a list of filters (match-action conditions), a list of
   interface the filter-based forwarding operates on.

   The filter based-RIB will event-condition-action policy (ECA) rules
   based a set of policies specified by the I2RS FB-RIB.  The filter-
   based RIB may utilize policies defined by common IETF policy modules
   or customer specific policies.  The following policies are used in
   this version of the yang module:

   o  Access lists (ACLs) [I-D.ietf-netmod-acl-model] (Note: The ACL
      Filters do not provide enough depth to support all use cases for
      filter-based FIBS.  These filters are included for cases where
      this limited filters will work.  In early deployments of the FB-
      FIB, these filters may be the only filters provided. ),

   o  Basic network filters [I-D.hares-i2rs-bnp-info-model]

   The Filter-Based routing may provide many benefits, including better
   resource allocation, load balancing and QoS.

   The I2RS use cases which benefit from Filter-Based Routing are:




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   o  Protocol independent Use cases and large flow use cases described
      in [I-D.hares-i2rs-usecase-reqs-summary].

   o  the use cases of steering traffic to their designated service
      functions that are different than the packet's destinations, and

   o  large flow use cases described in
      [I-D.hares-i2rs-usecase-reqs-summary]

                 Ingress Port match examples
                              |
                              |
          +-------+--------+--+------+-----+------+----+-----+
          |       |        |         |     |      |    |     |
          |       |        |         |     |      |    |     |
      L3-Header L2-header L4-header VLAN  VN ID  size event ...

   Figure 1: Example of matching conditions for basic network filters

      The action has to be egress port specific.

          Figure 1: The network model structure


2.  Definitions and Acronyms

   CLI

      Command Line Interface

   FB-RIB

      Filter-Based Routing Information Base

   FB-Route

      The policy rules in the filter-based RIB are prescriptive of the
      Event-Condition-Action form which is often represented by if
      Condition then action".

   Policy Group

      Policy Groups are groups of policy rules.  The groups of policy in
      the basic network policy [I-D.hares-i2rs-bnp-info-model] allow
      grouping of policy by name.  This name allow easier management of
      customer-based or provider based filters.

   RIB IM



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      RIB Informational Model (RIB IM) [I-D.ietf-i2rs-rib-info-model]

   Routing instance

      A routing instance, in the context of the FB-FIB is a collection
      of RIBs, interfaces, and routing parameters.  A routing instance
      creates a logical slice of the router and allows different logical
      slices; across a set of routers; to communicate with each other.

3.  Filter-Based-RIB module

   A Filter-Based RIB (FB-RIB)contains an ordered set of filter routes
   where each filter-route is a match condition followed by an action.
   An FB-RIB is contained in a routing-instance that is defined in
   [I-D.ietf-i2rs-rib-info-model] and whose data modelling is done in
   [I-D.ietf-i2rs-rib-data-model].  An FB-RIB has a list of interfaces
   that is a subset of the list of interfaces in the routing-instance
   that it is contained in.  An incoming packet on an interface
   belonging to a FB-RIB is first handled by the FIB programmed using
   that FB-RIB.  If no match action succeeds, then the packet is
   forwarded using the FIB programmed using the RIB of that routing
   instance.

   An ordered set of filters implies that the insertion of a filter
   route into a FB-RIB MUST provide the ability to insert a filter route
   at any specific position and delete of a filter-based route at a
   specific position.  The ability to change a filter route at a
   specific position combines these two functions (delete an existing
   filter route rule and add a new policy rule).

   Each FB-RIB is contained within a routing instance, but one routing
   instance (named by an INSTANCE_NAME) can contain multiple FB-RIBs.
   Each routing instance is associated with a set of interfaces, a
   router-id, and list of FB-RIBs.  Each interface can be associated
   with at most one FB RIB.

   The processing within the FB-RIB process within the routing system is
   expected to do the following:

   o  When a packet successfully matches match term/entry in a filter-
      route, the corresponding rule-actions are applied.

   o  If a packet does not match the match term/entry in the filter
      route, the filter route processing goes to the next term/entry in
      the order, and looks for a match, within the current filter or
      goes to the next filter in the list.  This continues until either
      a filter route match term/entry is successfully matched, or no
      more filters in the list exists.



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   o  If no match has been found within list of filters in FB-RIB list,
      then the packet will be forwarded using the I2RS RIB specified by
      the FB-RIB if one exists.  If no I2RS RIB is specified, the packet
      will be discarded.

            +-------------------------------+
            |     routing instance          |
            +-----------|-------------------+
                        |
                        |
               +--------|----+
               |FB-RIB *list |
               |             |
               +--|----------+
                  |
                  ^
                 /|\
            +-----^-----------------------+
            |        FB-RIB               |
            +----|------|-------------|---+
                 |  +---|----+  +-----|-----+
                 |  | I2 RIB |  |interface* |
                 |  | Name   |  | (Names)   |
                 |  +--------+  +-----------+
                             |
            +-----------------------+
            | FB-RIB Ordered List   |
            |   of filter rules     |
            +-----------|-----------+
                        | Filter policy list-entries
                        | entries depend on type
                        |  (ACL, Routing, QOS, SFC)
            +-----------|-----------+
            |    Groups             |
            +-----------|-----------+
                        | Groups depend on type
            +-----------|--------------+
            |      Rules (by type)     |
            |(ordered list of rules of |
            | the form match-action)   |
            +--------------------------+
                        | Entries depend on type


              Figure 2: Routing instance with FB-RIB






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   Policy definitions

   ACL types:
   Policy level access-lists
   group level: access_lists: access-list-entries
   rule level:  access_lists: access-list-entries:
                  access-list-entry


   BNP QOS
   Policy level: bnp-eca: bnp-policy-set
   group level:  bnp-eca: bnp-policy-set:rule-group-list:rule-group
   rule level:   bnp-eca: bnp-policy-set:rule-group-list:rule-group
                 policy-rule-list: policy-rule

   Note: The ACL policy definitions do not provide sufficient
          depth for the I2RS Filter RIB, but
              are provided here for early implementations.

   Figure 3


3.1.  FB-RIB entries

   The FB-RIB entries associated with each FB-RIB in a routing instance
   are:

   instance-name (FB-FIB-instance-name)

      Name of Routing instance

   router-id (FB-RIB-router-id)

      router id associated with the FB-RIB function of the Routing
      instance

   Interface_list(FB-RIB-interface)

      A list of interfaces that all of the FB-RIB RIBs operate over.
      This list must be a subset of the interface_list associated with
      the routing instance.

   Default RIB

      A RIB contained in the same routing instance that can be used to
      forward packets when the FIB entries in the FB-RIB list do not
      match the packets.  This Default-RIB forwards based on destination
      based routing.



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   FB-RIB Order list of policy (FB-FIB-O-Filters

      ordered list of filter rules of the form in
      [I-D.hares-i2rs-bnp-info-model]

   The Top-level Yang structure for the FB-RIB is:

    module: FB-RIB
    +--FB-RIB-module
       +--rw FB-RIB-instance-name
       +--rw RB-RIB-router-id
          uses rt:router-id
       +--rw FB-RIB*  [rib-name]
           |  +--rw rib-Name
           |  +--rw rib-afi
       |  +--rw fb-rib-intf* if:inteface-ref
           |  +--rw I2RS-RIB
           |  |  +--RIB-name
           |  |    uses i2rs-rib:name
           |  +--rw fb-rib-status-info
           |  |  +--rw fb-rib-update-ref uint64
           |  +--rw fb-rib-Group*
             +-rw filter-type  // for group
             +-rw order-number // for group
               + choice (filter-type)
                 +-case: acl
                  uses: acl: access_lists: access-list-entries
                             // operational status augment to group
                  augments: access_lists: access-list-entries
                  uses fb-rib-group-order_status;

              // operational status augment to individual ACL
                  augments: access_lists:access-list-entries:
                                        access-list-entry
                               uses fb-rib-rule-order-status;

               +--case: bnp-eca Rules
                  uses bnp-eca: bnp-policy-set
                    augments bnp-eca:bnp-policy-set:group-list:group
                        uses fb-rib-group-order_status
                    augment bnp-eca:bnp-policy-set:group-list:group:rule
                        uses fb-rib-rule-order_status

                     Figure 4: FB RIB Yang Structure







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3.2.  Relationship between RB-RIB Rule Model and RIB Information Model

   The I2RS RIB module is described in [I-D.ietf-i2rs-rib-info-model]
   and [I-D.ietf-i2rs-rib-data-model].  The I2RS RIB contains a
   collection of RIBs with the following information per instance:

   o  The set of interfaces indicates which interfaces are associated
      with this routing instance.

   o  The RIBs specify how incoming traffic is to be forwarded based on
      destination (E.g.  RIB and FB-RIB).

   o  The routing parameters control the information in the RIBs.

   A routing instance may have both an I2RS RIB modules and I2RS FB-FIB
   modules associated with it.

   FB-RIB and RIB can not be used at the same time, which means:

   o  If a router doesn't support filter-based routing, a router MUST
      use RIB and MUST not use FB-RIB.

   o  If a router supports filter-based routing:

      *  FB-RIB is used

      *  Multiple FB-RIBs may exist within a routing instance

      *  An interface can be associated with at most one FB-RIB

      *  The Default RIB for a FB-RIB is used if several criteria beyond
         destination address is not matched.

4.  yang models

4.1.  Filter-Based RIB types

           module fb-rib-types {

     yang-version "1";

     // namespace
     namespace "urn:TBD1:params:xml:ns:yang:rt:i2rs:fbrib-types";
       // replace with iana namespace when assigned
       prefix "i2rs-fbrib-types";

     // meta
     organization



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       "TBD2""

     contact
        "email: sriganesh.kini@ericsson.com
         email: cengiz@packetdesign.com
         email: anoop@ieee.duke.edu
         email: ivandean@gmal.org
         email: shares@ndzh.com;
         email: linda.dunbar@huawei.com;
         email: russ@riw.com;
         email: Jeff.Tantsura@ericsson.com;
            "

     description
       "This module describes a YANG model for the I2RS
       Filter-based RIB Types.  These types
       specify types for the Filter-Based RIB.


           Copyright (c) 2015 IETF Trust and the persons identified as
       the document authors.  All rights reserved.

       Redistribution and use in source and binary forms, with or
       without modification, is permitted pursuant to, and subject
       to the license terms contained in, the Simplified BSD
       License set forth in Section 4.c of the IETF Trust's Legal
       Provisions Relating to IETF Documents
       (http://trustee.ietf.org/license-info)."


     revision "2015-06-20" {
         description
           "I2RS Filter-Based RIB protocol ";
         reference "TBD";
     }

       typedef fb-rib-policy-type {
              type identityref {
                base "fb-rib-policy-type";
                    }
                   description
                   "This type is used to refer to FB-RIB type";
                   }


              identity fb-rib-acl {
                     base fb-rib-policy-type;
                 description



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             "filter based policy based on access-lists";
               }

              identity fb-bnp-eca-rules {
                     base fb-rib-policy-type;
                 description
             "filter based policy based on qos forwarding rules";
               }

           typedef fb-rules-status  {
              type identityref {
                base "fb-rule-oper-status-base";
                    }
                   description
                   "This type is used to refer to FB-RIB type";
        }
             identity fb-rule-inactive {
               type identityref {
                   base fb-rule-status;}
                   description
                   "policy rule is inactive";
                   }

             identity fb-rule-active {
               type identityref {
                   base fb-rule-status;}
                   description
                   "policy rule is active";
                   }

             grouping fb-rib-order-status {
             leaf statement-order {
                     type unit16;
                     description "order identifier"
             }
              leaf statement-oper_status {
                      type fb-rules-status;
                      description "status of rule"
                   }
           }
        group-fb-rib-group-order-status {
             leaf group-order{ type uint16;
               description "default group order";
              }
             leaf group-refcnt {type uint16
               description "refcnt for this group";
                   }
              leaf group installed {type uint16;



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               description "number of rules installed";
                   }
             }
     }


4.2.  fb-fib yang module

  module fb-rib {

    yang-version "1";

    // namespace
    namespace "urn:TBD1:params:xml:ns:yang:rt:i2rs:fbrib";
      // replace with iana namespace when assigned
      prefix "i2rs-fb-rib";


    // import some basic inet types
    import ietf-inet-types { prefix inet; }  // RFC6991
    import ietf-interfaces {prefix "if";}
    import i2rs-rib {prefix i2rs-rib; }
    import ietf-routing {prefix "rt"};
    import i2rs-fb-rib-types {prefix fb-rib-types}
    import access-control-list {prefix ietf-acl;}
    import bnp-eca-policy {prefix eca-pol;}
    // meta
    organization
      "TBD2""

    contact
       "email: sriganesh.kini@ericsson.com
            email: cengiz@packetdesign.com
        email: anoop@ieee.duke.edu
        email: ivandean@gmal.org
        email: shares@ndzh.com;
        email: linda.dunbar@huawei.com;
        email: russ@riw.com;
        email: Jeff.Tantsura@ericsson.com;
           "

    description
      "This module describes a YANG model for the I2RS
          Filter-based RIB which is a protocol independent I2RS module.


    /// top level FB-RIB structure
    container routing-instance {



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      description
        "Configuration of an 'i2rs' pseudo-protocol instance
         consists of a list of ribs.";

          // name of instance
      leaf name {
        description
          "A routing instance is identified by its name,
          INSTANCE_name.  This MUST be unique across all routing
          instances in a given network device.";
        type string ;
        mandatory true;
      }

          //
       list interface-list {
        description
          "This represents the list of interfaces associated
           with this routing instance.  The interface list helps
           constrain the boundaries of packet forwarding.
           Packets coming on these interfaces are directly
           associated with the given routing instance.  The
           interface list contains a list of identifiers, with
           each identifier uniquely identifying an interface.";
           key "name";
               leaf name {
           type if:interface-ref;
           description
           "A reference to the name of a configured network layer
           interface.";
           }
           }
        container router-id {
                  uses rt:router-id;
            }

        container i2rs-fb-rib {
                key "fb-rib-name";
                    container fb-rib-name {
                     leaf name {type string};
            }
             list interface-list {
          description
          "This represents the list of interfaces associated
           that this Filter-Based RIB runs on.";
          key "name";
          leaf name {
                  }



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          type if:interface-ref;
          description
           "A reference to the name of a configured network layer
           interface.";
          }
             }

                   container fb-rib-group-list  {
                      description "lists of groups of ordered lists";
                          leaf group-name {type string};
                  container fb-group-status {
                           uses fb-group-order_status;
                          }
                           case fb-rib-acl {
                             uses acl:access_lists: access-list-entries;
                      augments acl:access-lists:access-list-entries;
                        uses fb-rib-group-order_status;
                          augments acl:access-lists:access-list-entries;
                           }
                           case fb-eca-rules {
                             uses bnp-eca:bnp-policy-sets
                  augments bnp-eca:bnp-policy-set:\
                                      rule-group-list:rule-group;
                      uses fb-rib-group-order_status;
                      augments bnp-eca:bnp-policy-set:\
                            rule-group-list:rule-group:rule-list:rule
                                      uses fb-rib-rule-order_status
                           }
                     container fb-rib_status {
                       leaf fb-rib-update-ref;
                 type unit64;
                description "reference count for fb-rib";
                      }
           }
    }
  }

5.  IANA Considerations

   TBD.

6.  Security Considerations

   TBD.







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7.  References

7.1.  Normative References:

   [I-D.hares-i2rs-bnp-info-model]
              Hares, S., Wu, Q., Tantsura, J., and R. White, "An
              Information Model for Basic Network Policy and Filter
              Rules", draft-hares-i2rs-bnp-info-model-02 (work in
              progress), March 2015.

   [I-D.ietf-i2rs-architecture]
              Atlas, A., Halpern, J., Hares, S., Ward, D., and T.
              Nadeau, "An Architecture for the Interface to the Routing
              System", draft-ietf-i2rs-architecture-09 (work in
              progress), March 2015.

   [I-D.ietf-i2rs-rib-data-model]
              Wang, L., Ananthakrishnan, H., Chen, M.,
              amit.dass@ericsson.com, a., Kini, S., and N. Bahadur, "A
              YANG Data Model for Routing Information Base (RIB)",
              draft-ietf-i2rs-rib-data-model-00 (work in progress),
              April 2015.

   [I-D.ietf-i2rs-rib-info-model]
              Bahadur, N., Folkes, R., Kini, S., and J. Medved, "Routing
              Information Base Info Model", draft-ietf-i2rs-rib-info-
              model-06 (work in progress), March 2015.

   [I-D.ietf-netmod-acl-model]
              Bogdanovic, D., Sreenivasa, K., Huang, L., and D. Blair,
              "Network Access Control List (ACL) YANG Data Model",
              draft-ietf-netmod-acl-model-03 (work in progress), June
              2015.

7.2.  Informative References

   [I-D.hares-i2rs-usecase-reqs-summary]
              Hares, S. and M. Chen, "Summary of I2RS Use Case
              Requirements", draft-hares-i2rs-usecase-reqs-summary-02
              (work in progress), May 2015.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.








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Authors' Addresses

   Sriganesh Kini
   Ericsson

   Email: sriganesh.kini@ericsson.com


   Susan Hares
   Huawei
   7453 Hickory Hill
   Saline, MI  48176
   USA

   Email: shares@ndzh.com


   Linda Dunbar
   Huawei
   USA

   Email: linda.dunbar@huawei.com


   Anoop Ghanwani
   Dell

   Email: anoop@alumni.duke.edu


   Ram Krishnan
   Dell

   Email: Ramkri123@gmail.com


   Dean Bogdanovic
   Juniper Networks
   Westford, MA

   Email: deanb@juniper.net


   Jeff Tantsura
   Ericsson

   Email: jeff.tantsura@ericsson.com




Kini, et al.             Expires January 7, 2016               [Page 16]


Internet-Draft             Filter-Base RIB IM                  July 2015


   Russ White
   Ericsson

   Email: russ@riw.us















































Kini, et al.             Expires January 7, 2016               [Page 17]