[Docs] [txt|pdf|xml|html] [Tracker] [Email] [Nits]

Versions: 00 01

Network Working Group                                              N. Wu
Internet-Draft                                                 Z. Zhuang
Intended status: Standards Track                                  Huawei
Expires: April 21, 2016                                 October 19, 2015


                 BGP Extensions for Segment Allocation
               draft-wu-idr-bgp-segment-allocation-ext-00

Abstract

   This document defines extensions to the BGP-LS to distribute/push the
   segment information to its administrative SR domain and describes
   some use cases.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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 April 21, 2016.

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



Wu & Zhuang              Expires April 21, 2016                 [Page 1]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


   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.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Allocating Segment in BGP Networks  . . . . . . . . . . .   3
     3.2.  Allocating Segment in IGP Networks  . . . . . . . . . . .   3
   4.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Node NLRI for Segment Allocation  . . . . . . . . . . . .   3
     4.2.  Link NLRI for Segment Allocation  . . . . . . . . . . . .   4
     4.3.  Prefix NLRI for Segment Allocation  . . . . . . . . . . .   5
   5.  Applications  . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Allocating Segments for BGP Networks  . . . . . . . . . .   6
       5.1.1.  Node-SID Distribution via a Prefix NLRI . . . . . . .   7
       5.1.2.  Adj-SID Distribution via a Link NLRI  . . . . . . . .   7
     5.2.  Allocating Segments for IGP Networks  . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   In those networks with a central controller, it may be beneficial to
   allocate and manage SIDs for the network since the controller has the
   whole link-state database in mind.  This document proposes BGP
   extensions to allocate SIDs in a centralized manner instead of
   distribution way.

2.  Terminology

   o  MPP: MPLS Path Programming

   o  RR: Route Reflector

   o  SID: Segment Identifier

   o  SR-Path: Segment Routing Path





Wu & Zhuang              Expires April 21, 2016                 [Page 2]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


3.  Motivation

3.1.  Allocating Segment in BGP Networks

   It is possible that BGP may be the only routing protocol in some
   networks, such as the one described in
   [I-D.ietf-rtgwg-bgp-routing-large-dc].  If Segment Routing
   [I-D.ietf-spring-segment-routing] is going to be used for in the
   dataplane, it will be better to allocate SIDs in a centralized manner
   since no IGP flooding mechanism to advertise now.

   In order to allocating SIDs, the centralized allocator SHOULD collect
   BGP network topology database ahead, which at least consists of BGP
   speakers, prefixes and adjacencies among them.  No concrete technique
   for collecting this database has been specified in this document.

3.2.  Allocating Segment in IGP Networks

   In the scenario SR & LDP interoperation described in
   [I-D.ietf-spring-segment-routing-ldp-interop], if mapping entries are
   allocated in a centralized manner, e.g. a controller, it is possible
   that Binding SIDs will be populated to a designated SRMS through a
   protocol instead of IGP, no matter whether the SRMS is a dedicated
   server or function module.

4.  Protocol Extensions

   This section defines a new Protocol-ID called as BGP-Segment-
   Allocation (TBA) in the BGP-LS specification.  The use of a new
   Protocol-ID allows separation and differentiation between the NLRIs
   carrying Segment Allocation information from the NLRIs carrying IGP
   link-state information as defined in [I-D.ietf-idr-ls-distribution].

4.1.  Node NLRI for Segment Allocation

   This section describes the Node NLRI used for allocating the Node-
   SID.  The Node NLRI Type uses descriptors and attributes already
   defined in [I-D.ietf-idr-ls-distribution].  The format of the Node
   NLRI Type is as follows:












Wu & Zhuang              Expires April 21, 2016                 [Page 3]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+
     |  Protocol-ID  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           Identifier                          |
     |                            (64 bits)                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     //      Local Node Descriptors                                 //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where:

   o  Protocol-ID set to the new Protocol-ID: BGP-Segment-Allocation

   o  Node Descriptors defined in [I-D.ietf-idr-ls-distribution] can be
      reused

   This NLRI MAY contain BGP-LS-SR TLV 1033 (SID/Label Binding) as its
   attribute.

4.2.  Link NLRI for Segment Allocation

   This section describes the Link NLRI used for allocating the Adj-SID.
   The format of the Link NLRI Type is as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+
     |  Protocol-ID  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           Identifier                          |
     |                            (64 bits)                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     //      Local Node Descriptors                                 //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     //      Remote Node Descriptors                                //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     //      Link Descriptors                                       //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where:

   o  Protocol-ID set to the new Protocol-ID: BGP-Segment-Allocation

   o  Node Descriptors and Link Descriptors defined in
      [I-D.ietf-idr-ls-distribution] can be reused.




Wu & Zhuang              Expires April 21, 2016                 [Page 4]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


   Following TLV will be used in Link Attribute:

   o  BGP-LS-SR TLV 1034: SR Capabilities

   o  BGP-LS-SR TLV 1035: SR Algorithm

   o  BGP-LS-SR TLV 1099: Adj-SID

   o  BGP-LS-SR TLV 1036: Peer-SID

   o  BGP-LS-SR TLV 1037: Peer-Set-SID

4.3.  Prefix NLRI for Segment Allocation

   This section describes the Prefix NLRI used for Allocating the
   Prefix-SID.  The format of the Link NLRI Type is as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+
     |  Protocol-ID  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           Identifier                          |
     |                            (64 bits)                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     //      Local Node Descriptors                                 //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     //      Prefix Descriptors                                     //
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where:

   o  Protocol-ID set to the new Protocol-ID: BGP-Segment-Allocation

   o  Node Descriptors and Prefix Descriptors defined in
      [I-D.ietf-idr-ls-distribution] can be reused.

   Following TLV will be used in Prefix Attribute:

   o  BGP-LS-SR TLV 1034: SR Capabilities

   o  BGP-LS-SR TLV 1035: SR Algorithm

   o  BGP-LS-SR TLV 1158: Prefix SID






Wu & Zhuang              Expires April 21, 2016                 [Page 5]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


5.  Applications

5.1.  Allocating Segments for BGP Networks

   As shown below, we assume:

   Each node is its own AS (Node X has AS X).  The loopback of Node X is
   1.1.1.x/32.

   Each node peers with its neighbors via BGP session.

   Each node peers with Controller via BGP session.

   Local BGP-LS Identifier in Node X is set to X0000.

                           /----------\
                          |            |
                          | Controller |
                          |            |
                           \----------/
                                 |
         +-----------------------+-------------------------------+
         |                       |                               |
         |              +------+ | +------+                      |
         |              |  N7  |-+-|  N8  |           Tier-1     |
         |              +------+   +------+                      |
         |                |  |       |  |                        |
         |      +---------+  |       |  +----------+             |
         |      | +-------+--+-------+--+-------+  |             |
         |      | |       |  |       |  |       |  |             |
         |    +----+     +----+     +----+     +----+            |
         |    | N3 |-----| N4 |     | N5 |-----| N6 | Tier-2     |
         |    +----+     +----+     +----+     +----+            |
         |       |         |           |         |               |
         |       | +-----+ |           | +-----+ |               |
         |       +-| N1  |-+           +-| N2  |-+    Tier-3     |
         |         +-----+               +-----+                 |
         |          | | |                | | |                   |
         |      <- Servers ->         <- Servers ->              |
         +-------------------------------------------------------+

   When the controller has collected the topology information of this
   BGP network, it can start segment allocation to the network.








Wu & Zhuang              Expires April 21, 2016                 [Page 6]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


5.1.1.  Node-SID Distribution via a Prefix NLRI

   A Node-SID represents a Node and has a global significance, something
   like a loopback of a router.  Like an operator assigns a loopback's
   to their routers, it's expected that the Node-SID value will be
   assigned to every node.  The assigned value can be an absolute or
   Index value and must be globally unique.  In order to push a Node-SID
   for a router(e.g., N7), Controller advertise a Prefix NLRI to all the
   routers of the BGP-SR Network, where:

   o  Protocol-ID set to the new Protocol-ID: BGP-Segment-Allocation

   o  Local Node Descriptors contains

      *  BGP Router-ID: 7.7.7.7

      *  Local ASN: AS7

      *  BGP-LS Identifier: 70000

   o  Prefix Descriptors

      *  7.7.7.7/32

   o  Prefix Attribute contains

      *  BGP-LS-SR TLV 1034: SR Capabilities

      *  BGP-LS-SR TLV 1035: SR Algorithm

      *  BGP-LS-SR TLV 1158: Prefix SID, With the N-flag (node-SID flag)
         set.

      *  Other Prefix Attributes.

5.1.2.  Adj-SID Distribution via a Link NLRI

   In order to push a Adj-SID for a router(e.g., N7 connects to N8),
   Controller advertise a Link NLRI to all the routers of the BGP-SR
   Network, where:

   o  Protocol-ID set to the new Protocol-ID: BGP-Segment-Allocation

   o  Local Node Descriptors contains

      *  BGP Router-ID: 7.7.7.7

      *  Local ASN: AS7



Wu & Zhuang              Expires April 21, 2016                 [Page 7]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


      *  BGP-LS Identifier: 70000

   o  Remote Node Descriptors contains

      *  BGP Router-ID: 8.8.8.8

      *  Local ASN: AS8

      *  BGP-LS Identifier: 80000

   o  Link Descriptors

      *  BGP session IPv4 local address: 7.7.7.7

      *  BGP session IPv4 peer address: 8.8.8.8

   o  Link Attribute contains

      *  BGP-LS-SR TLV 1034: SR Capabilities

      *  BGP-LS-SR TLV 1035: SR Algorithm

      *  BGP-LS-EPE TLV 1036: Peer-Node-SID

      *  Other Prefix Attributes.

   In the similar way, the controller can distribute Peer-Adj-SID and
   Peer-Set-SID.

5.2.  Allocating Segments for IGP Networks

   In IGP networks deployed with SR, the method defined in
   [I-D.ietf-idr-ls-distribution] to populate the topology database and
   the SRGB to the controller.

   A controller may use the extensions defined in this document to
   populate mapping entries to the SRMS.  Then the SRMS will advertise
   this mapping to all the SR Nodes via IGP.

   In the following figure, LSR1-10 and LSR20 are only running LDP and
   R21-to-R25 Routers are SR capable Routers.  R21 and R22 will be
   running both SR and LDP as they are on the border between SR and LDP.
   The whole network is running single IGP let's say IS-IS.








Wu & Zhuang              Expires April 21, 2016                 [Page 8]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


                                           /----------\
                                          |            |
                                          | Controller |
                                          |            |
                                           \----------/
                                               /   \
                                              /     \
     +----------------------------+----------/-------\---------------+
     |     LDP Domain             |         /SR Domain\              |
     |                            |        /           \             |
     | ------                  -------    /   ------    \ ---------  |
     | |LSR1|\                 | R21 |---+----| R23|\----\|Mapping|  |
     | ------ \               /-------\      / ------\    |Server |  |
     | 10.1.1.1\             / 20.1.1.1\    / 20.1.1.3\   --------+  |
     |          \           /     |     \  /           \  30.1.1.1   |
     | ------    \ ------- /      |      \/             \ ------     |
     | |LSR2|-----\|LSR20|/       |      /\              \| R25|     |
     | ------    / -------\       |     /  \             /------     |
     | 10.1.1.2 / 10.1.1.20\      |    /    \           / 20.1.1.5   |
     | ...     /            \     |   /      \         /             |
     | ------ /              \-------/        \------ /              |
     ||LSR10|/                | R22 |----------|R24 |/               |
     | ------                 -------          ------                |
     | 10.1.1.10              20.1.1.2         20.1.1.4              |
     |                            |                                  |
     |                            |                                  |
     +----------------------------+----------------------------------+

   The Node-SIDs and their corresponding label value mapping could be
   like this:

                   Prefix         Index Value     Range
                   ------------------------------------
                   10.1.1.1/32    1001            10
                   10.1.1.20/32   1020             1
                   20.1.1.1/32    2001             5


   The controller will advertise a node NLRI to Mapping Server, where:

   o  Protocol-ID set to the new Protocol-ID: BGP-Segment-Allocation

   o  Local Node Descriptors contains

      *  Mapping Server's node descriptor

   o  Node Attribute contains




Wu & Zhuang              Expires April 21, 2016                 [Page 9]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


      *  BGP-LS-SR TLV-1033: SID/Label Binding TLV

      *  Other Prefix Attributes

   Mapping Server will convert BGP-LS-SR TLV-1033 to IS-IS TLV-149, and
   advertise this mapping to all the SR Nodes via IS-IS.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Type     |     Length    |0|0|           |     Weight    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            Range = 10         |       /32     |      10       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       .1      |        .1     |       .1      |Prefix-SID Type|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | sub-TLV Length|     Flags     |   Algorithm   |               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                             1 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Type     |     Length    |0|0|           |     Weight    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            Range = 1          |       /32     |       10      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       .1      |        .1     |       .20     |Prefix-SID Type|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | sub-TLV Length|     Flags     |   Algorithm   |               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                            20 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Type     |     Length    |0|0|           |     Weight    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            Range = 5          |       /32     |      20       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       .1      |        .1     |       .1      |Prefix-SID Type|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | sub-TLV Length|     Flags     |   Algorithm   |               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                             1 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   A node receiving a MS entry for a prefix MUST check the existence of
   such prefix in its link-state database prior to consider and use the
   associated SID.  This has been defined in
   [I-D.ietf-isis-segment-routing-extensions].




Wu & Zhuang              Expires April 21, 2016                [Page 10]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


6.  IANA Considerations

   TBD.

7.  Security Considerations

   TBD.

8.  Acknowledgements

   TBD.

9.  References

9.1.  Normative References

   [I-D.ietf-idr-ls-distribution]
              Gredler, H., Medved, J., Previdi, S., Farrel, A., and S.
              Ray, "North-Bound Distribution of Link-State and TE
              Information using BGP", draft-ietf-idr-ls-distribution-13
              (work in progress), October 2015.

   [I-D.ietf-isis-segment-routing-extensions]
              Previdi, S., Filsfils, C., Bashandy, A., Gredler, H.,
              Litkowski, S., Decraene, B., and J. Tantsura, "IS-IS
              Extensions for Segment Routing", draft-ietf-isis-segment-
              routing-extensions-05 (work in progress), June 2015.

   [I-D.ietf-rtgwg-bgp-routing-large-dc]
              Lapukhov, P., Premji, A., and J. Mitchell, "Use of BGP for
              routing in large-scale data centers", draft-ietf-rtgwg-
              bgp-routing-large-dc-07 (work in progress), August 2015.

   [I-D.ietf-spring-segment-routing]
              Filsfils, C., Previdi, S., Decraene, B., Litkowski, S.,
              and r. rjs@rob.sh, "Segment Routing Architecture", draft-
              ietf-spring-segment-routing-06 (work in progress), October
              2015.

   [I-D.ietf-spring-segment-routing-ldp-interop]
              Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., and
              S. Litkowski, "Segment Routing interoperability with LDP",
              draft-ietf-spring-segment-routing-ldp-interop-00 (work in
              progress), October 2015.







Wu & Zhuang              Expires April 21, 2016                [Page 11]


Internet-Draft    BGP Extensions for Segment Allocation     October 2015


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

9.2.  Informative References

   [I-D.gredler-idr-bgp-ls-segment-routing-extension]
              Gredler, H., Ray, S., Previdi, S., Filsfils, C., Chen, M.,
              and J. Tantsura, "BGP Link-State extensions for Segment
              Routing", draft-gredler-idr-bgp-ls-segment-routing-
              extension-02 (work in progress), October 2014.

   [I-D.ietf-idr-bgpls-segment-routing-epe]
              Previdi, S., Filsfils, C., Ray, S., Patel, K., Dong, J.,
              and M. Chen, "Segment Routing Egress Peer Engineering BGP-
              LS Extensions", draft-ietf-idr-bgpls-segment-routing-
              epe-00 (work in progress), June 2015.

Authors' Addresses

   Nan Wu
   Huawei
   Huawei Bld., No.156 Beiqing Rd.
   Beijing  100095
   China

   Email: eric.wu@huawei.com


   Shunwan Zhuang
   Huawei
   Huawei Bld., No.156 Beiqing Rd.
   Beijing  100095
   China

   Email: zhuangshunwan@huawei.com














Wu & Zhuang              Expires April 21, 2016                [Page 12]

Html markup produced by rfcmarkup 1.129b, available from https://tools.ietf.org/tools/rfcmarkup/