< draft-ietf-idr-bgp-prefix-sid-01.txt   draft-ietf-idr-bgp-prefix-sid-02.txt >
IDR S. Previdi IDR S. Previdi
Internet-Draft C. Filsfils Internet-Draft C. Filsfils
Intended status: Standards Track A. Lindem Intended status: Standards Track A. Lindem
Expires: April 16, 2016 K. Patel Expires: June 23, 2016 K. Patel
A. Sreekantiah A. Sreekantiah
Cisco Systems Cisco Systems
S. Ray S. Ray
Unaffiliated Unaffiliated
H. Gredler H. Gredler
Juniper Networks Individual
October 14, 2015 December 21, 2015
Segment Routing Prefix SID extensions for BGP Segment Routing Prefix SID extensions for BGP
draft-ietf-idr-bgp-prefix-sid-01 draft-ietf-idr-bgp-prefix-sid-02
Abstract Abstract
Segment Routing (SR) architecture allows a node to steer a packet Segment Routing (SR) architecture allows a node to steer a packet
flow through any topological path and service chain by leveraging flow through any topological path and service chain by leveraging
source routing. The ingress node prepends a SR header to a packet source routing. The ingress node prepends a SR header to a packet
containing a set of "segments". Each segment represents a containing a set of "segments". Each segment represents a
topological or a service-based instruction. Per-flow state is topological or a service-based instruction. Per-flow state is
maintained only at the ingress node of the SR domain. maintained only at the ingress node of the SR domain.
skipping to change at page 2, line 7 skipping to change at page 2, line 7
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 16, 2016. This Internet-Draft will expire on June 23, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 2, line 39 skipping to change at page 2, line 39
3.1. MPLS Prefix Segment . . . . . . . . . . . . . . . . . . . 4 3.1. MPLS Prefix Segment . . . . . . . . . . . . . . . . . . . 4
3.2. IPv6 Prefix Segment . . . . . . . . . . . . . . . . . . . 5 3.2. IPv6 Prefix Segment . . . . . . . . . . . . . . . . . . . 5
4. BGP-Prefix-SID Attribute . . . . . . . . . . . . . . . . . . 5 4. BGP-Prefix-SID Attribute . . . . . . . . . . . . . . . . . . 5
4.1. Label-Index TLV . . . . . . . . . . . . . . . . . . . . . 6 4.1. Label-Index TLV . . . . . . . . . . . . . . . . . . . . . 6
4.2. IPv6 SID . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2. IPv6 SID . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3. Originator SRGB TLV . . . . . . . . . . . . . . . . . . . 8 4.3. Originator SRGB TLV . . . . . . . . . . . . . . . . . . . 8
5. Receiving BGP-Prefix-SID Attribute . . . . . . . . . . . . . 9 5. Receiving BGP-Prefix-SID Attribute . . . . . . . . . . . . . 9
5.1. MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . . 9 5.1. MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . . 9
5.2. IPv6 Dataplane . . . . . . . . . . . . . . . . . . . . . 10 5.2. IPv6 Dataplane . . . . . . . . . . . . . . . . . . . . . 10
6. Announcing BGP-Prefix-SID Attribute . . . . . . . . . . . . . 10 6. Announcing BGP-Prefix-SID Attribute . . . . . . . . . . . . . 10
6.1. MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . . 10 6.1. MPLS Dataplane: Labeled Unicast . . . . . . . . . . . . . 11
6.2. IPv6 Dataplane . . . . . . . . . . . . . . . . . . . . . 11 6.2. IPv6 Dataplane . . . . . . . . . . . . . . . . . . . . . 11
7. Error Handling of BGP-Prefix-SID Attribute . . . . . . . . . 11 7. Error Handling of BGP-Prefix-SID Attribute . . . . . . . . . 12
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9. Security Considerations . . . . . . . . . . . . . . . . . . . 12 9. Security Considerations . . . . . . . . . . . . . . . . . . . 13
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
11. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 12 11. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 13
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 13 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
12.1. Normative References . . . . . . . . . . . . . . . . . . 13 12.1. Normative References . . . . . . . . . . . . . . . . . . 13
12.2. Informative References . . . . . . . . . . . . . . . . . 13 12.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Segment Routing Documents 1. Segment Routing Documents
The main references for this document are the SR architecture defined The main references for this document are the SR architecture defined
in [I-D.ietf-spring-segment-routing] and the related use case in [I-D.ietf-spring-segment-routing] and the related use case
illustrated in [I-D.ietf-spring-segment-routing-msdc]. illustrated in [I-D.ietf-spring-segment-routing-msdc].
The Segment Routing Egress Peer Engineering architecture is described The Segment Routing Egress Peer Engineering architecture is described
in [I-D.filsfils-spring-segment-routing-central-epe]. in [I-D.ietf-spring-segment-routing-central-epe].
The Segment Routing Egress Peer Engineering BGPLS extensions are The Segment Routing Egress Peer Engineering BGPLS extensions are
described in [I-D.ietf-idr-bgpls-segment-routing-epe]. described in [I-D.ietf-idr-bgpls-segment-routing-epe].
2. Introduction 2. Introduction
Segment Routing (SR) architecture leverages the source routing Segment Routing (SR) architecture leverages the source routing
paradigm. A group of inter-connected nodes that use SR forms a SR paradigm. A group of inter-connected nodes that use SR forms a SR
domain. The ingress node of the SR domain prepends a SR header domain. The ingress node of the SR domain prepends a SR header
containing "segments" to an incoming packet. Each segment represents containing "segments" to an incoming packet. Each segment represents
skipping to change at page 3, line 34 skipping to change at page 3, line 34
path" or a service instruction (e.g.: "pass through deep packet path" or a service instruction (e.g.: "pass through deep packet
inspection"). By inserting the desired sequence of instructions, the inspection"). By inserting the desired sequence of instructions, the
ingress node is able to steer a packet via any topological path and/ ingress node is able to steer a packet via any topological path and/
or service chain; per-flow state is maintained only at the ingress or service chain; per-flow state is maintained only at the ingress
node of the SR domain. node of the SR domain.
Each segment is identified by a Segment Identifier (SID). As Each segment is identified by a Segment Identifier (SID). As
described in [I-D.ietf-spring-segment-routing], when SR is applied to described in [I-D.ietf-spring-segment-routing], when SR is applied to
the MPLS dataplane the SID consists of a label while when SR is the MPLS dataplane the SID consists of a label while when SR is
applied to the IPv6 dataplane the SID consists of an IPv6 prefix (see applied to the IPv6 dataplane the SID consists of an IPv6 prefix (see
[I-D.previdi-6man-segment-routing-header]). [I-D.ietf-6man-segment-routing-header]).
A BGP-Prefix Segment (aka BGP-Prefix-SID), is a BGP segment attached A BGP-Prefix Segment (aka BGP-Prefix-SID), is a BGP segment attached
to a BGP prefix. A BGP-Prefix-SID is always global within the SR/BGP to a BGP prefix. A BGP-Prefix-SID is always global within the SR/BGP
domain and identifies an instruction to forward the packet over the domain and identifies an instruction to forward the packet over the
ECMP-aware best-path computed by BGP to the related prefix. The BGP- ECMP-aware best-path computed by BGP to the related prefix. The BGP-
Prefix-SID is the identifier of the BGP prefix segment. Prefix-SID is the identifier of the BGP prefix segment.
This document describes the BGP extension to signal the BGP-Prefix- This document describes the BGP extension to signal the BGP-Prefix-
SID. Specifically, this document defines a new BGP attribute known SID. Specifically, this document defines a new BGP attribute known
as the BGP Prefix SID attribute and specifies the rules to originate, as the BGP Prefix SID attribute and specifies the rules to originate,
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The BGP-Prefix-SID attached to a BGP prefix P represents the The BGP-Prefix-SID attached to a BGP prefix P represents the
instruction "go to Prefix P" along its BGP bestpath (potentially instruction "go to Prefix P" along its BGP bestpath (potentially
ECMP-enabled). ECMP-enabled).
3.1. MPLS Prefix Segment 3.1. MPLS Prefix Segment
The BGP Prefix Segment is realized on the MPLS dataplane in the The BGP Prefix Segment is realized on the MPLS dataplane in the
following way: following way:
A Multiprotocol BGP labeled IPv4/IPv6 Unicast ([RFC3107]) session As described in [I-D.ietf-spring-segment-routing-msdc] the
type is required. operator assigns a globally unique "index", L_I, to a locally
sourced prefix of a BGP speaker N which is advertised to all other
BGP speakers in the SR domain.
According to [I-D.ietf-spring-segment-routing], each BGP speaker According to [I-D.ietf-spring-segment-routing], each BGP speaker
is configured with a label block called the Segment Routing Global is configured with a label block called the Segment Routing Global
Block (SRGB). While it is recommended to use the same SRGB across Block (SRGB). While it is recommended to use the same SRGB across
all the nodes within the SR domain, the SRGB of a node is a local all the nodes within the SR domain, the SRGB of a node is a local
property and could be different on different speakers. The property and could be different on different speakers. The
drawbacks of the use case where BGP speakers have different SRGBs drawbacks of the use case where BGP speakers have different SRGBs
are documented in [I-D.ietf-spring-segment-routing]. are documented in [I-D.ietf-spring-segment-routing] and
[I-D.ietf-spring-segment-routing-msdc].
As described in [I-D.ietf-spring-segment-routing-msdc] the If traffic-engineering within the SR domain is required, each node
operator assigns a globally unique "index", L_I, to a locally may also be required to advertise topological information and
sourced prefix of a BGP speaker N which is advertised to all other Peering SID's for each of its links and peers. This informations
BGP speakers in the SR domain. is required in order to perform the explicit path computation and
to express any explicit path into a list of segments. The
advertisement of topological information and Peer segments is
assumed to be done through
[I-D.ietf-idr-bgpls-segment-routing-epe].
If the BGP speakers are not all configured with the same SRGB, and
if traffic-engineering within the SR domain is required, each node
may be required to advertise its local SRGB in addition to the
topological information.
This documents assumes that BGP-LS is the preferred method for
collecting both topological, peer segments and SRGB information
through [I-D.ietf-idr-ls-distribution],
[I-D.ietf-idr-bgpls-segment-routing-epe] and
[I-D.gredler-idr-bgp-ls-segment-routing-ext]. However, as an
optional alternative for the advertisement of the local SRGB
without the topology nor the peer SID's, hence without
applicability for TE, the Originator SRGB TLV of the prefix-SID
attribute, is specified in Section 4.3 of this document.
The index L_I is a 32 bit offset in the SRGB. Each BGP speaker The index L_I is a 32 bit offset in the SRGB. Each BGP speaker
derives its local MPLS label, L, by adding L_I to the start value derives its local MPLS label, L, by adding L_I to the start value
of its own SRGB, and programs L in its MPLS dataplane as its of its own SRGB, and programs L in its MPLS dataplane as its
incoming/local label for the prefix. incoming/local label for the prefix. See Section 5.1 for more
details.
The outgoing label for the prefix is found in the NLRI of the The outgoing label for the prefix is found in the NLRI of the
Multiprotocol BGP labeled IPv4/IPv6 Unicast prefix advertisement. Multiprotocol BGP labeled IPv4/IPv6 Unicast prefix advertisement.
The index L_I is only used as a hint to derive the local/incoming The index L_I is only used as a hint to derive the local/incoming
label. label.
If the BGP speakers cannot be configured with the same SRGB and Section 4.1 of this document specifies the Label-Index TLV of the
traffic-engineering within the SR domain is required, each node BGP Prefix-SID attribute; this TLV can be used to advertise the
MAY be required to advertise its local SRGB. label index of a given prefix.
The preferred method leverages
[I-D.ietf-idr-bgpls-segment-routing-epe].
Indeed, in order to engineer traffic, it is important to have the
internal topology (BGP-LS extensions provide these), the peering
topology (BGP-LS-EPE extensions provide these), and the equivalent
of adjacency segments for each link in the topology (BGP-LS-EPE
extensions provide these through the PeerAdj segments). The first
two provide the topology input to the optimization process. The
latter provides a deterministic method to engineer a flow through
any desired path.
In some very-simplified traffic-engineering context, it might not
be necessary to have either the topology or the adjacency
segments. In such simplified case, the BGP Prefix SID provides an
alternative method to distribute the SRGB of each node.
If the BGP speakers cannot be configured with the same SRGB, the
proposed BGP Prefix-SID attribute allows the advertisement of the
SRGB so each node can advertise the SRGB it's configured with. The
drawbacks of the use case where BGP speakers have different SRGBs are
documented in [I-D.ietf-spring-segment-routing-msdc].
In order to advertise the label index of a given prefix P and, In order to advertise the label index of a given prefix P and,
optionally, the SRGB, a new extension to BGP is needed: the BGP optionally, the SRGB, a new extension to BGP is needed: the BGP
Prefix SID attribute. This extension is described in subsequent Prefix SID attribute. This extension is described in subsequent
sections. sections.
3.2. IPv6 Prefix Segment 3.2. IPv6 Prefix Segment
As defined in [I-D.previdi-6man-segment-routing-header], and as As defined in [I-D.ietf-6man-segment-routing-header], and as
illustrated in [I-D.ietf-spring-segment-routing-msdc], when SR is illustrated in [I-D.ietf-spring-segment-routing-msdc], when SR is
used over an IPv6 dataplane, the BGP Prefix Segment is instantiated used over an IPv6 dataplane, the BGP Prefix Segment is instantiated
by an IPv6 prefix originated by the BGP speaker. by an IPv6 prefix originated by the BGP speaker.
Each node advertises a globally unique IPv6 address representing Each node advertises a globally unique IPv6 address representing
itself in the domain. This prefix (e.g.: its loopback interface itself in the domain. This prefix (e.g.: its loopback interface
address) is advertised to all other BGP speakers in the SR domain. address) is advertised to all other BGP speakers in the SR domain.
Also, each node MUST advertise its support of Segment Routing for Also, each node MUST advertise its support of Segment Routing for
IPv6 dataplane. This is realized using the flags contained in the IPv6 dataplane. This is realized using the flags contained in the
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S| | |S| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
* S flag: if set then it means that the BGP speaker attaching the * S flag: if set then it means that the BGP speaker attaching the
Prefix-SID Attribute to a prefix is capable of processing the Prefix-SID Attribute to a prefix is capable of processing the
IPv6 Segment Routing Header (SRH, IPv6 Segment Routing Header (SRH,
[I-D.previdi-6man-segment-routing-header]) for the segment [I-D.ietf-6man-segment-routing-header]) for the segment
corresponding to the originated IPv6 prefix. The use case corresponding to the originated IPv6 prefix. The use case
leveraging the S flag is described in leveraging the S flag is described in
[I-D.ietf-spring-segment-routing-msdc]. [I-D.ietf-spring-segment-routing-msdc].
The other bits of the flag field SHOULD be clear on transmission The other bits of the flag field SHOULD be clear on transmission
an MUST be ignored at reception. an MUST be ignored at reception.
4.3. Originator SRGB TLV 4.3. Originator SRGB TLV
The Originator SRGB TLV is an optional TLV and has the following The Originator SRGB TLV is an optional TLV and has the following
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o Type is 3. o Type is 3.
o Length is the total length of the value portion of the TLV: 2 + o Length is the total length of the value portion of the TLV: 2 +
multiple of 6. multiple of 6.
o Flags: 16 bits of flags. None are defined in this document. o Flags: 16 bits of flags. None are defined in this document.
Flags SHOULD be clear on transmission an MUST be ignored at Flags SHOULD be clear on transmission an MUST be ignored at
reception. reception.
o SRGB: 3 octets of base followed by 3 octets of range. Note that o SRGB: 3 octets of base followed by 3 octets of range. Note that
SRGB field MAY appear multiple times. the SRGB field MAY appear multiple times. If the SRGB field
appears multiple times, the SRGB consists of multiple ranges. The
meaning of an SRGB with multiple ranges is explained in
Section 3.2 ("SID/Label Range TLV") of
[I-D.ietf-ospf-segment-routing-extensions].
The Originator SRGB TLV contains the SRGB of the router originating The Originator SRGB TLV contains the SRGB of the router originating
the prefix to which the BGP Prefix SID is attached and MUST be kept the prefix to which the BGP Prefix SID is attached and MUST be kept
in the Prefix-SID Attribute unchanged during the propagation of the in the Prefix-SID Attribute unchanged during the propagation of the
BGP update. BGP update.
The originator SRGB describes the SRGB of the node where the BGP The originator SRGB describes the SRGB of the node where the BGP
Prefix Segment end. It is used to build SRTE policies when different Prefix Segment end. It is used to build SRTE policies when different
SRGB's are used in the fabric SRGB's are used in the fabric
([I-D.ietf-spring-segment-routing-msdc]). ([I-D.ietf-spring-segment-routing-msdc]).
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7. Error Handling of BGP-Prefix-SID Attribute 7. Error Handling of BGP-Prefix-SID Attribute
When a BGP Speaker receives a BGP Update message containing a When a BGP Speaker receives a BGP Update message containing a
malformed BGP Prefix-SID attribute, it MUST ignore the received BGP malformed BGP Prefix-SID attribute, it MUST ignore the received BGP
Prefix-SID attributes and not pass it to other BGP peers. This is Prefix-SID attributes and not pass it to other BGP peers. This is
equivalent to the -attribute discard- action specified in [RFC7606]. equivalent to the -attribute discard- action specified in [RFC7606].
When discarding an attribute, a BGP speaker MAY log an error for When discarding an attribute, a BGP speaker MAY log an error for
further analysis. further analysis.
If the BGP Prefix-SID attribute appears more than once in an BGP If the BGP Prefix-SID attribute appears more than once in an BGP
Update message message, then, according to [RFC7606], all the Update message, then, according to [RFC7606], all the occurrences of
occurrences of the attribute other than the first one SHALL be the attribute other than the first one SHALL be discarded and the BGP
discarded and the BGP Update message shall continue to be processed. Update message shall continue to be processed.
When a BGP speaker receives an unacceptable Prefix-SID attribute, it When a BGP speaker receives an unacceptable Prefix-SID attribute, it
MAY log an error for further analysis. MAY log an error for further analysis.
8. IANA Considerations 8. IANA Considerations
This document defines a new BGP path attribute known as the BGP This document defines a new BGP path attribute known as the BGP
Prefix-SID attribute. This document requests IANA to assign a new Prefix-SID attribute. This document requests IANA to assign a new
attribute code type (suggested value: 40) for BGP the Prefix-SID attribute code type (suggested value: 40) for BGP the Prefix-SID
attribute from the BGP Path Attributes registry. attribute from the BGP Path Attributes registry.
Currently, IANA temporarily assigned the following:
40 BGP Prefix-SID (TEMPORARY - registered 2015-09-30, expires
2016-09-30) [draft-ietf-idr-bgp-prefix-sid]
This document defines 3 new TLVs for BGP Prefix-SID attribute. These This document defines 3 new TLVs for BGP Prefix-SID attribute. These
TLVs need to be registered with IANA. We request IANA to create a TLVs need to be registered with IANA. We request IANA to create a
new registry for BGP Prefix-SID Attribute TLVs as follows: new registry for BGP Prefix-SID Attribute TLVs as follows:
Under "Border Gateway Protocol (BGP) Parameters" registry, "BGP Under "Border Gateway Protocol (BGP) Parameters" registry, "BGP
Prefix SID attribute Types" Reference: draft-ietf-idr-bgp-prefix- Prefix SID attribute Types" Reference: draft-ietf-idr-bgp-prefix-sid
sid-00 Registration Procedure(s): Values 1-254 First Come, First Registration Procedure(s): Values 1-254 First Come, First Served,
Served, Value 0 and 255 reserved Value 0 and 255 reserved
Value Type Reference Value Type Reference
0 Reserved draft-ietf-idr-bgp-prefix-sid-00 0 Reserved this document
1 Label-Index draft-ietf-idr-bgp-prefix-sid-00 1 Label-Index this document
2 IPv6 SID draft-ietf-idr-bgp-prefix-sid-00 2 IPv6 SID this document
3 Originator SRGB draft-ietf-idr-bgp-prefix-sid-00 3 Originator SRGB this document
4-254 Unassigned 4-254 Unassigned
255 Reserved draft-ietf-idr-bgp-prefix-sid-00 255 Reserved this document
9. Security Considerations 9. Security Considerations
This document introduces no new security considerations above and This document introduces no new security considerations above and
beyond those already specified in [RFC4271] and [RFC3107]. beyond those already specified in [RFC4271] and [RFC3107].
10. Acknowledgements 10. Acknowledgements
The authors would like to thanks Satya Mohanty and Acee Lindem for The authors would like to thanks Satya Mohanty for his contribution
their contribution to this document. to this document.
11. Change Log 11. Change Log
Initial Version: Sep 21 2014 Initial Version: Sep 21 2014
12. References 12. References
12.1. Normative References 12.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
skipping to change at page 13, line 34 skipping to change at page 13, line 48
Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February
2006, <http://www.rfc-editor.org/info/rfc4364>. 2006, <http://www.rfc-editor.org/info/rfc4364>.
[RFC7606] Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K. [RFC7606] Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K.
Patel, "Revised Error Handling for BGP UPDATE Messages", Patel, "Revised Error Handling for BGP UPDATE Messages",
RFC 7606, DOI 10.17487/RFC7606, August 2015, RFC 7606, DOI 10.17487/RFC7606, August 2015,
<http://www.rfc-editor.org/info/rfc7606>. <http://www.rfc-editor.org/info/rfc7606>.
12.2. Informative References 12.2. Informative References
[I-D.filsfils-spring-segment-routing-central-epe] [I-D.gredler-idr-bgp-ls-segment-routing-ext]
Filsfils, C., Previdi, S., Patel, K., Shaw, S., Ginsburg, Previdi, S., Psenak, P., Filsfils, C., Gredler, H., Chen,
D., and D. Afanasiev, "Segment Routing Centralized Egress M., and J. Tantsura, "BGP Link-State extensions for
Peer Engineering", draft-filsfils-spring-segment-routing- Segment Routing", draft-gredler-idr-bgp-ls-segment-
central-epe-05 (work in progress), August 2015. routing-ext-01 (work in progress), December 2015.
[I-D.ietf-6man-segment-routing-header]
Previdi, S., Filsfils, C., Field, B., Leung, I., Linkova,
J., Kosugi, T., Vyncke, E., and D. Lebrun, "IPv6 Segment
Routing Header (SRH)", draft-ietf-6man-segment-routing-
header-00 (work in progress), December 2015.
[I-D.ietf-idr-bgpls-segment-routing-epe] [I-D.ietf-idr-bgpls-segment-routing-epe]
Previdi, S., Filsfils, C., Ray, S., Patel, K., Dong, J., Previdi, S., Filsfils, C., Ray, S., Patel, K., Dong, J.,
and M. Chen, "Segment Routing Egress Peer Engineering BGP- and M. Chen, "Segment Routing Egress Peer Engineering BGP-
LS Extensions", draft-ietf-idr-bgpls-segment-routing- LS Extensions", draft-ietf-idr-bgpls-segment-routing-
epe-00 (work in progress), June 2015. epe-02 (work in progress), December 2015.
[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-ospf-segment-routing-extensions]
Psenak, P., Previdi, S., Filsfils, C., Gredler, H.,
Shakir, R., Henderickx, W., and J. Tantsura, "OSPF
Extensions for Segment Routing", draft-ietf-ospf-segment-
routing-extensions-05 (work in progress), June 2015.
[I-D.ietf-spring-segment-routing] [I-D.ietf-spring-segment-routing]
Filsfils, C., Previdi, S., Decraene, B., Litkowski, S., Filsfils, C., Previdi, S., Decraene, B., Litkowski, S.,
and r. rjs@rob.sh, "Segment Routing Architecture", draft- and r. rjs@rob.sh, "Segment Routing Architecture", draft-
ietf-spring-segment-routing-05 (work in progress), ietf-spring-segment-routing-07 (work in progress),
September 2015. December 2015.
[I-D.ietf-spring-segment-routing-central-epe]
Filsfils, C., Previdi, S., Ginsburg, D., and D. Afanasiev,
"Segment Routing Centralized Egress Peer Engineering",
draft-ietf-spring-segment-routing-central-epe-00 (work in
progress), October 2015.
[I-D.ietf-spring-segment-routing-msdc] [I-D.ietf-spring-segment-routing-msdc]
Filsfils, C., Previdi, S., Mitchell, J., and P. Lapukhov, Filsfils, C., Previdi, S., Mitchell, J., and P. Lapukhov,
"BGP-Prefix Segment in large-scale data centers", draft- "BGP-Prefix Segment in large-scale data centers", draft-
ietf-spring-segment-routing-msdc-00 (work in progress), ietf-spring-segment-routing-msdc-00 (work in progress),
October 2015. October 2015.
[I-D.previdi-6man-segment-routing-header]
Previdi, S., Filsfils, C., Field, B., Leung, I., Linkova,
J., Kosugi, T., Vyncke, E., and D. Lebrun, "IPv6 Segment
Routing Header (SRH)", draft-previdi-6man-segment-routing-
header-08 (work in progress), October 2015.
[RFC4760] Bates, T., Chandra, R., Katz, D., and Y. Rekhter, [RFC4760] Bates, T., Chandra, R., Katz, D., and Y. Rekhter,
"Multiprotocol Extensions for BGP-4", RFC 4760, "Multiprotocol Extensions for BGP-4", RFC 4760,
DOI 10.17487/RFC4760, January 2007, DOI 10.17487/RFC4760, January 2007,
<http://www.rfc-editor.org/info/rfc4760>. <http://www.rfc-editor.org/info/rfc4760>.
Authors' Addresses Authors' Addresses
Stefano Previdi Stefano Previdi
Cisco Systems Cisco Systems
Via Del Serafico, 200 Via Del Serafico, 200
skipping to change at page 15, line 19 skipping to change at page 16, line 4
Email: keyupate@cisco.com Email: keyupate@cisco.com
Arjun Sreekantiah Arjun Sreekantiah
Cisco Systems Cisco Systems
170 W. Tasman Drive 170 W. Tasman Drive
San Jose, CA 95124 95134 San Jose, CA 95124 95134
USA USA
Email: asreekan@cisco.com Email: asreekan@cisco.com
Saikat Ray Saikat Ray
Unaffiliated Unaffiliated
Email: raysaikat@gmail.com Email: raysaikat@gmail.com
Hannes Gredler Hannes Gredler
Juniper Networks Individual
AT
Email: hannes@juniper.net Email: hannes@gredler.at
 End of changes. 31 change blocks. 
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