Network Working Group X. Xu
Internet-Draft Huawei
Intended status: Standards Track U. Chunduri
Expires: April 18, 2015 Ericsson
M. Bhatia
Ionos Networks
October 15, 2014
Carrying Routable IP Addresses in OSPF RI LSA
draft-ietf-ospf-routable-ip-address-01
Abstract
This document proposes two new TLVs within the body of the OSPF
Router Information (RI) Opaque LSA, called Routable IPv4 Address TLV
and Routable IPv6 Address TLV. Here the term OSPF means both OSPFv2
and OSPFv3.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Routable IPv4 Address TLV . . . . . . . . . . . . . . . . . . 3
4. Routable IPv6 Address TLV . . . . . . . . . . . . . . . . . . 3
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
7. Security Considerations . . . . . . . . . . . . . . . . . . . 4
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
8.1. Normative References . . . . . . . . . . . . . . . . . . 4
8.2. Informative References . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
There are several situations where it is required for OSPF routers in
one area to find correlations between routable IP addresses and
capabilities of OSPF routers in another area. One example is the
Entropy Label Capability (ELC) advertisement [I-D.xu-ospf-mpls-elc]
across the OSPF domain. In this example, assume the ELC TLV
originated by a router in one area is propagated to another area.
Those routers in the latter area need to find routable IP addresses
of the router originating that ELC TLV before inserting the Entropy
Label (EL) for packets going to the Label Switch Path (LSP) tunnel
towards one of the above routable IP addresses. Another example is
the S-BFD discriminator distribution
[I-D.bhatia-ospf-sbfd-discriminator] across the OSPF domain. In this
example, assume the S-BFD Discriminator TLV originated by a router in
one area is propagated to another area. Those routers in the latter
area need to find routable IP addresses of the router originating
that S-BFD Discriminator TLV so as to set up S-BDF sessions with that
originating router.
However, in the OSPF Router Information (RI) Opaque LSA as defined in
[RFC4970], which is used by OSPF routers to announce their
capabilities, there is no such field for containing routable IP
addresses of the originating router. Therefore, this document
propose two new TLVs within the body of OSPF RI LSA, called Routable
IPv4 Address TLV and Routable IPv6 Address TLV, which are used to
carry routable IPv4 and IPv6 addresses respectively. Here the term
OSPF means both OSPFv2 and OSPFv3.
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1.1. 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].
2. Terminology
This memo makes use of the terms defined in [RFC4970].
3. Routable IPv4 Address TLV
A new TLV within the body of the OSPF RI Opaque LSA, called Routable
IPv4 Address TLV is defined to carry one or more routable IPv4
addresses of the router originating the RI LSA. The Type of this TLV
is TBD, the Length is variable (multiple of 4), and the Value field
contains one or more routable IPv4 addresses of the router
originating the RI LSA. This TLV is applicable to OSPFv2 and for
IPv4 Address Families (AFs) of OSPFv3 [RFC5838]. The scope of the
advertisement MUST be domain-wide as mapping between the originator
and advertised address is required only when crossing the area
boundaries.
4. Routable IPv6 Address TLV
A new TLV within the body of the OSPFv3 RI Opaque LSA, called
Routable IPv6 Address TLV is defined to carry one or more routable
IPv6 global addresses of the router originating the RI LSA. The Type
of this TLV is TBD, the Length is variable (multiple of 16), and the
Value field contains one or more routable IPv6 global addresses of
the router originating the RI LSA. This TLV is only applicable to
OSPFv3. The scope of the advertisement MUST be domain-wide as
mapping between the originator and advertised address is required
only when crossing the area boundaries.
5. Acknowledgements
Thanks Karsten Thomann, Anton Smirnov, Joel Jaeggli, Joel M.
Halpern, Wes George, Les Ginsberg, Abhay Roy, Mach Chen, Peter Psenak
and Acee Lindem for their support and valuable comments on this
draft.
6. IANA Considerations
This document includes a request to IANA to allocate two TLV type
codes for the new TLVs proposed in Section 3 and Section 4 of this
document from OSPF Router Information (RI) TLVs Registry defined by
[RFC4970].
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7. Security Considerations
This document describes a mechanism for advertising routable IP
address information through OSPF Router Information Opaque LSA and
does not introduce any new security issues other than what is
specified by [RFC4970].
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4970] Lindem, A., Shen, N., Vasseur, JP., Aggarwal, R., and S.
Shaffer, "Extensions to OSPF for Advertising Optional
Router Capabilities", RFC 4970, July 2007.
8.2. Informative References
[I-D.bhatia-ospf-sbfd-discriminator]
Bhatia, M., Ranganath, T., Pignataro, C., and S. Aldrin,
"OSPF extensions to advertise S-BFD Target Discriminator",
draft-bhatia-ospf-sbfd-discriminator-00 (work in
progress), May 2014.
[I-D.xu-ospf-mpls-elc]
Xu, X., Kini, S., Sivabalan, S., Filsfils, C., and S.
Litkowski, "Signaling Entropy Label Capability Using
OSPF", draft-xu-ospf-mpls-elc-01 (work in progress),
October 2014.
[RFC5838] Lindem, A., Mirtorabi, S., Roy, A., Barnes, M., and R.
Aggarwal, "Support of Address Families in OSPFv3", RFC
5838, April 2010.
Authors' Addresses
Xiaohu Xu
Huawei
Email: xuxiaohu@huawei.com
Uma Chunduri
Ericsson
Email: uma.chunduri@ericsson.com
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Manav Bhatia
Ionos Networks
Email: manav@ionosnetworks.com
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