Internet DRAFT - draft-acee-ospf-bgp-rr
draft-acee-ospf-bgp-rr
Network Working Group A. Lindem
Internet-Draft Cisco Systems
Intended status: Standards Track K. Patel
Expires: March 11, 2018 Arrcus
S. Zandi
LinkedIn
R. Raszuk
Bloomberg LP
September 7, 2017
OSPF Extensions for Advertising/Signaling BGP Route Reflector
Information
draft-acee-ospf-bgp-rr-01.txt
Abstract
This document specifies an OSPF Router Information (RI) TLV to
advertise the BGP Router Reflector capability and peering
information. This information can be used by BGP Router Reflector
clients to dynamically learn and establish sessions with BGP Router
Reflectors in the routing domain.
Status of This Memo
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This Internet-Draft will expire on March 11, 2018.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Notation . . . . . . . . . . . . . . . . . . 2
2. OSPF BGP Route Reflector TLV . . . . . . . . . . . . . . . . 2
3. OSPF Router Information (RI) Opaque LSAs . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 5
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
This document specifies an OSPF Router Information (RI) TLV [OSPF-RI]
to advertise the BGP Router Reflector [BGP-RR] capability and peering
information. This information can be used by BGP Router Reflector
clients to dynamically learn and establish sessions with BGP Router
Reflectors in the routing domain.
1.1. Requirements Notation
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-KEYWORDS].
2. OSPF BGP Route Reflector TLV
The BGP Router Reflector TLV can be used to advertise the route
reflector capability, local AS number, BGP peering address, and
supported AFI/SAFI pairs using an OSPFv2 [OSPF] or OSPFv3 [OSPFV3]
router using the OSPF Router Information LSA [OSPF-RI]. The OSPF
Router Information LSA can be advertised in either area or AS scoped
RI LSAs. The BGP Router Reflector TLV consists of the following
fields:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Local AS |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Address Family| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4/IPv6 Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| AFI | SAFI | AFI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| AFI | SAFI | o o o
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Length The length will be 12 for IPv4 peering addresses or
24 for IPv6 peering addresses plus 3 * the number
of AFI/SAFI pairs.
Local AS The Router-Reflector's local AS number. This can
either be used for AS match checking or certain
situations where the client's AS doesn't match the
route reflectors.
Address IANA Address family (1 for IPv4 or 2 for IPv6)
Family
Address Local IPv4 or IPv6 Address used for BGP peering.
AFI/SAFI Address Family Identifier (AFI)/ Subsequent
Address Family Identifier (SAFI). The AFI/SAFI tuple
0/0 will act as a wildcard indicating all configured
AFI/SAFIs.
OSPF BGP Route-Reflector TLV
o The BGP Route Reflector (RR) TLV MAY be advertised multiple times
with different peering addresses and AFI/SAFI pairs and MAY be
advertised in multiple OSPF RI LSAs. The AFI/SAFI tuple, (0,0)
will serve as a wildcard indicating all configured AFI/SAFI
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tuples. This can be used in deployments where the AF deployment
is fairly homogeneous.
o If different peering addresses are advertised for the same AFI/
SAFI pair, the decision of whether a BGP client establishes
sessions with one or more of the advertised peering addresses is
beyond the scope of this document.
o If the BGP Router Reflector (RR) TLV has an invalid length or is
otherwise malformed, it will not be used for BGP client session
establishment. The occurrence of a malformed TLV SHOULD be
logged.
3. OSPF Router Information (RI) Opaque LSAs
The OSPF BGP TLV may optionally be advertised in an area-scoped or
AS-scoped OSPFv2 Router Information (RI) opaque LSA or OSPFv3 Router
Information (RI) LSA [OSPF-RI]. BGP clients may then use the peering
address to establish BGP sessions with the advertising route-
reflector.
4. Security Considerations
Security considerations for the base OSPF protocol are covered in
[OSPF] and [OSPFV3].
5. IANA Considerations
The document will require the following IANA actions:
1. A Router Information TLV type for the BGP Router Reflector TLV
will be allocated from the OSPF Router Information (RI) TLVs
registry.
6. References
6.1. Normative References
[OSPF] Moy, J., "OSPF Version 2", STD 54, RFC 2328, April 1998.
[OSPF-RI] Lindem, A., Shen, N., Vasseur, J., Aggarwal, R., and S.
Shaffer, "Extensions to OSPF for Advertising Optional
Router Capabilities", RFC 7770, January 2016.
[OSPFV3] Coltun, R., Ferguson, D., Moy, J., and A. Lindem, "OSPF
for IPv6", RFC 5340, July 2008.
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[RFC-KEYWORDS]
Bradner, S., "Key words for use in RFC's to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
6.2. Informative References
[BGP-RR] Bates, T., Chen, E., and R. Chandra, "BGP Route
Reflection: An Alternative to Full Mesh Internal BGP
(IBGP)", RFC 4456, April 2006.
Appendix A. Acknowledgments
The RFC text was produced using Marshall Rose's xml2rfc tool.
Authors' Addresses
Acee Lindem
Cisco Systems
301 Midenhall Way
Cary, NC 27513
USA
Email: acee@cisco.com
Keyur Patel
Arrcus
Email: keyur@arrcus.com
Shawn Zandi
LinkedIn
Email: szandi@linkedin.com
Robert Raszuk
Bloomberg LP
731 Lexington Ave
New York City, NY 10022
USA
Email: robert@raszuk.net
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