One document matched: draft-eriksson-ldp-convergence-term-02.txt
Differences from draft-eriksson-ldp-convergence-term-01.txt
Network Working Group T. Eriksson
Internet-Draft TeliaSonera
Expires: April 28, 2005 S. Poretsky
Quarry Technologies
R. Papneja
Isocore
October 28, 2004
Terminology for Benchmarking LDP Data Plane Convergence
draft-eriksson-ldp-convergence-term-02.txt
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Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This document defines new terms for benchmarking of LDP convergence.
These terms are to be used in future methodology documents for
benchmarking LDP Convergence. Existing BMWG terminology documents
such as IGP Convergence Benchmarking [3] provide useful terms for LDP
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Convergence benchmarking. These terms are discussed in this
document. Applicable terminology for MPLS and LDP defined in MPLS WG
RFCs [1] and [2] is also discussed.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Existing Terminology . . . . . . . . . . . . . . . . . . . . . 3
2.1 BMWG Convergence Terms . . . . . . . . . . . . . . . . . . 3
2.2 MPLS/LDP Terms . . . . . . . . . . . . . . . . . . . . . . 4
3. Term Definitions . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 LDP Binding Table . . . . . . . . . . . . . . . . . . . . 5
3.2 FEC Forwarding Table . . . . . . . . . . . . . . . . . . . 6
3.3 FEC Convergence Event . . . . . . . . . . . . . . . . . . 6
3.4 FEC Forwarding Table Convergence . . . . . . . . . . . . . 6
3.5 FEC Convergence . . . . . . . . . . . . . . . . . . . . . 7
3.6 Multiple Next-Hop FEC . . . . . . . . . . . . . . . . . . 7
3.7 Ingress LSR . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 Egress LSR . . . . . . . . . . . . . . . . . . . . . . . . 8
4. Security Considerations . . . . . . . . . . . . . . . . . . . 9
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 10
Intellectual Property and Copyright Statements . . . . . . . . 11
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1. Introduction
This draft describes the terminology for benchmarking LDP
Convergence. An accompanying document describes the methodology for
doing the benchmarking [TBD]. The main motivation for doing this
work is the increased focus on lowering convergence time for LDP as
an alternative to other solutions such as MPLS Fast Reroute (i.e.
protection techniques using RSVP-TE extensions).
The purpose of this documents is to find existing terminology as well
as define new terminology when needed terms are not available. The
terminology will support the methodology that will be based on
black-box testing of the LDP dataplane. The approach is very similar
to the one found in [3] and [4].
2. Existing Terminology
2.1 BMWG Convergence Terms
Route Convergence
Defined in [3].
Convergence Packet Loss
Defined in [3].
Convergence Event Instant
Defined in [3].
Convergence Recovery Instant
Defined in [3].
Rate-Derived Convergence Time
Defined in [3].
Convergence Event Transition
Defined in [3].
Convergence Recovery Transition
Defined in [3].
Loss-Derived Convergence Time
Defined in [3].
Restoration Convergence Time
Defined in [3].
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Packet Sampling Interval
Defined in [3].
Local Interface
Defined in [3].
Neighbor Interface
Defined in [3].
Remote Interface
Defined in [3].
Preferred Egress Interface
Defined in [3].
Next-Best Egress Interface
Defined in [3].
Stale Forwarding
Defined in [3].
2.2 MPLS/LDP Terms
Label
Defined in [1].
FEC
Defined in [1].
Label Withdraw
Defined in [2].
IGP update message
Typically an IS-IS LSP or an OSPF LSA that contains information
about a change in the IGP topology.
LSP
Defined in [1].
LSR
Defined in [1].
Per-Interface label space
Defined in [1]
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Per-Platform label space
Defined in [1]
MPLS Node
Defined in [1].
MPLS Edge Node
Defined in [1].
MPLS Node
Defined in [1].
MPLS Edge Node
Defined in [1].
MPLS EgressNode
Defined in [1].
MPLS Ingress Node
Defined in [1].
Upstream LSR
Defined in [1].
Downstream LSR
Defined in [1].
3. Term Definitions
3.1 LDP Binding Table
Definition:
Table in which the LSR maintains all learned labels. It consists
of the prefix and label information bound to a peer's LDP
identifier and the list of sent and received bindings/peer.
Discussion:
None
Measurement Units:
N/A
Issues:
None
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See Also:
FEC Forwarding Table
3.2 FEC Forwarding Table
Definition:
Table in which the LSR maintains the next hop information for the
particular FEC with the associated outgoing label and interface.
The information used for setting up the FEC forwarding table is
retrieved from the LDP Binding Table.
Discussion:
None
Measurement Units:
N/A
Issues:
None
See Also:
LDP Binding Table
3.3 FEC Convergence Event
Definition:
The occurrence of a planned or unplanned action in the network
that results in a change to an LSR's LDP next-hop forwarding.
Discussion:
Convergence Events include link loss, routing protocol session
loss, router failure, and better next-hop. Also, different types
of administrative events such as interface shoutdown is
considered.
Measurement Units:
N/A
Issues:
None
See Also:
FEC Forwarding Table Convergence
FEC Convergence
3.4 FEC Forwarding Table Convergence
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Definition:
Recovery from a FEC Convergence Event that causes the FEC
Forwarding Table to change and re-stabilize.
Discussion:
FEC Forwarding Table Convergence updates after the RIB and LDP
Binding Table update due to a FEC Convergence Event. FEC
Forwarding Table Convergence can be observed externally by the
rerouting of data Traffic to a new egress interface.
Measurement Units:
N/A
Issues:
None
See Also:
FEC Forwarding Table
FEC Convergence Event
FEC Convergence
3.5 FEC Convergence
Definition:
Recovery from a FEC Convergence Event that causes the LDP Binding
Table to change and re-stabilize.
Discussion:
FEC Convergence is a change in an LDP Binding of a prefix and
label to a peer's LDP Identifier. This change can be an update or
recovery due to a FEC Convergence Event. FEC Convergence is an
LSR action made prior to FEC Forwarding Table Convergence. FEC
Convergence is not an externally observable Black-Box measurement.
Measurement Units:
N/A
Issues:
Where is LDP Identifier defined? Where is LDP Binding defined?
See Also:
LDP Binding Table
FEC Convergence Event
FEC Forwarding Table Convergence
3.6 Multiple Next-Hop FEC
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Definition:
A FEC with more than one next-hop and associated outgoing label
and interface.
Discussion:
A Multiple Next-Hop FEC can be verified from the FEC Forwarding
Table and from externally observing traffic being forwarded to a
FEC on one or more interfaces.
Measurement Units:
N/A
Issues:
None
See Also:
FEC Forwarding Table
3.7 Ingress LSR
Definition:
An MPLS ingress node which is capable of forwarding native L3
packets.
Discussion:
None
Measurement Units:
N/A
Issues:
None
See Also:
MPLS Node
MPLS Edge Node
MPLS Egress Node
MPLS Ingress Node
Label Switching Router (LSR)
Egress LSR
3.8 Egress LSR
Definition:
An MPLS Egress node which is capable of forwarding native L3
packets.
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Discussion:
None
Measurement Units:
N/A
Issues:
None
See Also:
MPLS Node
MPLS Edge Node
MPLS Egress Node
MPLS Ingress Node
Label Switching Router (LSR)
Ingress LSR
4. Security Considerations
Documents of this type do not directly effect the security of the
Internet or of corporate networks as long as benchmarking is not
performed on devices or systems connected to operating networks.
5. Acknowledgements
We thank Al Morton for providing valuble comments to this document.
6 References
[1] Rosen, E., Viswanathan, A. and R. Callon, "Multiprotocol Label
Switching Architecture", RFC 3031, January 2001.
[2] Andersson, L., Doolan, P., Feldman, N., Fredette, A. and B.
Thomas, "LDP Specification", RFC 3036, January 2001.
[3] Poretsky, S., "Terminology for Benchmarking IGP Data Plane Route
Convergence", draft-ietf-bmwg-igp-dataplane-conv-term-04 (work
in progress), October 2004.
[4] Poretsky, S. and B. Imhoff, "Benchmarking Methodology for IGP
Data Plane Route Convergence",
draft-ietf-bmwg-igp-dataplane-conv-meth-04 (work in progress),
October 2004.
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Authors' Addresses
Thomas Eriksson
TeliaSonera
EMail: thomas.a.eriksson@teliasonera.com
Scott Poretsky
Quarry Technologies
EMail: sporetsky@quarrytech.com
Rajiv Papneja
Isocore
EMail: rpapneja@isocore.com
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