draft-ietf-isis-te-metric-extensions-00.txt   draft-ietf-isis-te-metric-extensions-01.txt 
Networking Working Group S. Previdi, Ed. Networking Working Group S. Previdi, Ed.
Internet-Draft Cisco Systems, Inc. Internet-Draft Cisco Systems, Inc.
Intended status: Standards Track S. Giacalone Intended status: Standards Track S. Giacalone
Expires: December 19, 2013 Thomson Reuters Expires: April 13, 2014 Thomson Reuters
D. Ward D. Ward
Cisco Systems, Inc. Cisco Systems, Inc.
J. Drake J. Drake
A. Atlas A. Atlas
Juniper Networks Juniper Networks
C. Filsfils C. Filsfils
Cisco Systems, Inc. Cisco Systems, Inc.
June 17, 2013 Q. Wu
Huawei
October 10, 2013
IS-IS Traffic Engineering (TE) Metric Extensions IS-IS Traffic Engineering (TE) Metric Extensions
draft-ietf-isis-te-metric-extensions-00 draft-ietf-isis-te-metric-extensions-01
Abstract Abstract
In certain networks, such as, but not limited to, financial In certain networks, such as, but not limited to, financial
information networks (e.g. stock market data providers), network information networks (e.g. stock market data providers), network
performance criteria (e.g. latency) are becoming as critical to data performance criteria (e.g. latency) are becoming as critical to data
path selection as other metrics. path selection as other metrics.
This document describes extensions to IS-IS TE [RFC5305] such that This document describes extensions to IS-IS TE [RFC5305] such that
network performance information can be distributed and collected in a network performance information can be distributed and collected in a
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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 December 19, 2013. This Internet-Draft will expire on April 13, 2014.
Copyright Notice Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2013 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
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. TE Metric Extensions to IS-IS . . . . . . . . . . . . . . . . 5 2. TE Metric Extensions to IS-IS . . . . . . . . . . . . . . . . 5
3. Interface and Neighbor Addresses . . . . . . . . . . . . . . . 6 3. Interface and Neighbor Addresses . . . . . . . . . . . . . . . 6
4. Sub TLV Details . . . . . . . . . . . . . . . . . . . . . . . 6 4. Sub TLV Details . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Unidirectional Link Delay Sub-TLV . . . . . . . . . . . . 7 4.1. Unidirectional Link Delay Sub-TLV . . . . . . . . . . . . 7
4.2. Min/Max Unidirectional Link Delay Sub-TLV . . . . . . . . 7 4.2. Min/Max Unidirectional Link Delay Sub-TLV . . . . . . . . 7
4.3. Unidirectional Delay Variation Sub-TLV . . . . . . . . . . 9 4.3. Unidirectional Delay Variation Sub-TLV . . . . . . . . . . 9
4.4. Unidirectional Link Loss Sub-TLV . . . . . . . . . . . . . 9 4.4. Unidirectional Link Loss Sub-TLV . . . . . . . . . . . . . 9
4.5. Unidirectional Residual Bandwidth Sub-TLV . . . . . . . . 10 4.5. Unidirectional Residual Bandwidth Sub-TLV . . . . . . . . 10
4.6. Unidirectional Available Bandwidth Sub-TLV . . . . . . . . 11 4.6. Unidirectional Available Bandwidth Sub-TLV . . . . . . . . 11
5. Announcement Thresholds and Filters . . . . . . . . . . . . . 12 4.7. Unidirectional Utilized Bandwidth Sub-TLV . . . . . . . . 12
6. Announcement Suppression . . . . . . . . . . . . . . . . . . . 13 5. Announcement Thresholds and Filters . . . . . . . . . . . . . 13
6. Announcement Suppression . . . . . . . . . . . . . . . . . . . 14
7. Network Stability and Announcement Periodicity . . . . . . . . 14 7. Network Stability and Announcement Periodicity . . . . . . . . 14
8. Enabling and Disabling Sub-TLVs . . . . . . . . . . . . . . . 14 8. Enabling and Disabling Sub-TLVs . . . . . . . . . . . . . . . 15
9. Static Metric Override . . . . . . . . . . . . . . . . . . . . 14 9. Static Metric Override . . . . . . . . . . . . . . . . . . . . 15
10. Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 14 10. Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 15
11. Security Considerations . . . . . . . . . . . . . . . . . . . 14 11. Security Considerations . . . . . . . . . . . . . . . . . . . 15
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
13. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15 13. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
14. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15 14. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
14.1. Normative References . . . . . . . . . . . . . . . . . . . 15 14.1. Normative References . . . . . . . . . . . . . . . . . . . 16
14.2. Informative References . . . . . . . . . . . . . . . . . . 16 14.2. Informative References . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction 1. Introduction
In certain networks, such as, but not limited to, financial In certain networks, such as, but not limited to, financial
information networks (e.g. stock market data providers), network information networks (e.g. stock market data providers), network
performance information (e.g. latency) is becoming as critical to performance information (e.g. latency) is becoming as critical to
data path selection as other metrics. data path selection as other metrics.
In these networks, extremely large amounts of money rest on the In these networks, extremely large amounts of money rest on the
ability to access market data in "real time" and to predictably make ability to access market data in "real time" and to predictably make
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TBA Low/High Unidirectional Link Delay TBA Low/High Unidirectional Link Delay
TBA Unidirectional Delay Variation TBA Unidirectional Delay Variation
TBA Unidirectional Packet Loss TBA Unidirectional Packet Loss
TBA Unidirectional Residual Bandwidth TBA Unidirectional Residual Bandwidth
TBA Unidirectional Available Bandwidth TBA Unidirectional Available Bandwidth
TBA Unidirectional Bandwidth Utilization
As can be seen in the list above, the sub-TLVs described in this As can be seen in the list above, the sub-TLVs described in this
document carry different types of network performance information. document carry different types of network performance information.
The new sub-TLVs include a bit called the Anomalous (or "A") bit. The new sub-TLVs include a bit called the Anomalous (or "A") bit.
When the A bit is clear (or when the sub-TLV does not include an A When the A bit is clear (or when the sub-TLV does not include an A
bit), the sub-TLV describes steady state link performance. This bit), the sub-TLV describes steady state link performance. This
information could conceivably be used to construct a steady state information could conceivably be used to construct a steady state
performance topology for initial tunnel path computation, or to performance topology for initial tunnel path computation, or to
verify alternative failover paths. verify alternative failover paths.
When network performance violates configurable link-local thresholds When network performance violates configurable link-local thresholds
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4. Sub TLV Details 4. Sub TLV Details
4.1. Unidirectional Link Delay Sub-TLV 4.1. Unidirectional Link Delay Sub-TLV
This sub-TLV advertises the average link delay between two directly This sub-TLV advertises the average link delay between two directly
connected IS-IS neighbors. The delay advertised by this sub-TLV MUST connected IS-IS neighbors. The delay advertised by this sub-TLV MUST
be the delay from the local neighbor to the remote one (i.e. the be the delay from the local neighbor to the remote one (i.e. the
forward path latency). The format of this sub-TLV is shown in the forward path latency). The format of this sub-TLV is shown in the
following diagram: following diagram:
0 1 2 3 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 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |A| RESERVED | Delay | |A| RESERVED | Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Figure 1 Figure 1
Type: TBA Type: TBA
Length: 4 Length: 4
A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set
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should not be sent or be withdrawn. should not be sent or be withdrawn.
4.2. Min/Max Unidirectional Link Delay Sub-TLV 4.2. Min/Max Unidirectional Link Delay Sub-TLV
This sub-TLV advertises the minimum and maximum delay values between This sub-TLV advertises the minimum and maximum delay values between
two directly connected IS-IS neighbors. The delay advertised by this two directly connected IS-IS neighbors. The delay advertised by this
sub-TLV MUST be the delay from the local neighbor to the remote one sub-TLV MUST be the delay from the local neighbor to the remote one
(i.e. the forward path latency). The format of this sub-TLV is shown (i.e. the forward path latency). The format of this sub-TLV is shown
in the following diagram: in the following diagram:
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TBD2 | 8 | | Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| RESERVED | Low Delay | |A| RESERVED | Low Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | High Delay | | RESERVED | High Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Figure 2 Figure 2
Type: TBA Type: TBA
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4.3. Unidirectional Delay Variation Sub-TLV 4.3. Unidirectional Delay Variation Sub-TLV
This sub-TLV advertises the average link delay variation between two This sub-TLV advertises the average link delay variation between two
directly connected IS-IS neighbors. The delay variation advertised directly connected IS-IS neighbors. The delay variation advertised
by this sub-TLV MUST be the delay from the local neighbor to the by this sub-TLV MUST be the delay from the local neighbor to the
remote one (i.e. the forward path latency). The format of this sub- remote one (i.e. the forward path latency). The format of this sub-
TLV is shown in the following diagram: TLV is shown in the following diagram:
0 1 2 3 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 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |A| RESERVED |Delay Variation| |A| RESERVED | Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Figure 3 Figure 3
Type: TBA. Type: TBA.
Lenght: 4. Lenght: 4.
A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set
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4.4. Unidirectional Link Loss Sub-TLV 4.4. Unidirectional Link Loss Sub-TLV
This sub-TLV advertises the loss (as a packet percentage) between two This sub-TLV advertises the loss (as a packet percentage) between two
directly connected IS-IS neighbors. The link loss advertised by this directly connected IS-IS neighbors. The link loss advertised by this
sub-TLV MUST be the packet loss from the local neighbor to the remote sub-TLV MUST be the packet loss from the local neighbor to the remote
one (i.e. the forward path loss). The format of this sub-TLV is one (i.e. the forward path loss). The format of this sub-TLV is
shown in the following diagram: shown in the following diagram:
0 1 2 3 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 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |A| RESERVED | Link Loss | |A| RESERVED | Link Loss |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Loss |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This sub-TLV has a type of TBD3. This sub-TLV has a type of TBD3.
The length is 4. The length is 4.
where: where:
Type: TBA. Type: TBA.
Length: 4. Length: 4.
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1), the link packet loss has not been measured. 1), the link packet loss has not been measured.
4.5. Unidirectional Residual Bandwidth Sub-TLV 4.5. Unidirectional Residual Bandwidth Sub-TLV
This TLV advertises the residual bandwidth between two directly This TLV advertises the residual bandwidth between two directly
connected IS-IS neighbors. The residual bandwidth advertised by this connected IS-IS neighbors. The residual bandwidth advertised by this
sub-TLV MUST be the residual bandwidth from the system originating sub-TLV MUST be the residual bandwidth from the system originating
the LSA to its neighbor. the LSA to its neighbor.
0 1 2 3 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 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 |A| RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |A| RESERVED | Residual | | Residual Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Type: TBA. Type: TBA.
Length: 4. Length: 4.
A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set
when the measured value of this parameter exceeds its configured when the measured value of this parameter exceeds its configured
maximum threshold. The A bit is cleared when the measured value maximum threshold. The A bit is cleared when the measured value
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4.6. Unidirectional Available Bandwidth Sub-TLV 4.6. Unidirectional Available Bandwidth Sub-TLV
This Sub-TLV advertises the available bandwidth between two directly This Sub-TLV advertises the available bandwidth between two directly
connected IS-IS neighbors. The available bandwidth advertised by connected IS-IS neighbors. The available bandwidth advertised by
this sub-TLV MUST be the available bandwidth from the system this sub-TLV MUST be the available bandwidth from the system
originating this Sub-TLV. The format of this Sub-TLV is shown in the originating this Sub-TLV. The format of this Sub-TLV is shown in the
following diagram: following diagram:
0 1 2 3 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 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 |A| RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |A| RESERVED | Available | | Available Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Figure 4 Figure 4
Type: TBA. Type: TBA.
Length: 4. Length: 4.
A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set
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format with units of bytes per second. For a link or forwarding format with units of bytes per second. For a link or forwarding
adjacency, available bandwidth is defined to be residual bandwidth adjacency, available bandwidth is defined to be residual bandwidth
minus the measured bandwidth used for the actual forwarding of non- minus the measured bandwidth used for the actual forwarding of non-
RSVP-TE LSP packets. For a bundled link, available bandwidth is RSVP-TE LSP packets. For a bundled link, available bandwidth is
defined to be the sum of the component link available bandwidths defined to be the sum of the component link available bandwidths
minus the measured bandwidth used for the actual forwarding of non- minus the measured bandwidth used for the actual forwarding of non-
RSVP-TE Label Switched Paths packets. For a bundled link, available RSVP-TE Label Switched Paths packets. For a bundled link, available
bandwidth is defined to be the sum of the component link available bandwidth is defined to be the sum of the component link available
bandwidths. bandwidths.
4.7. Unidirectional Utilized Bandwidth Sub-TLV
This Sub-TLV advertises the bandwidth utilization between two
directly connected IS-IS neighbors. The bandwidth utilization
advertised by this sub-TLV MUST be the bandwidth from the system
originating this Sub-TLV. The format of this Sub-TLV is shown in the
following diagram:
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 |A| RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bandwidth Utilization |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
Figure 5
Type: TBA.
Length: 4.
A-bit. The A-bit represents the Anomalous (A) bit. The A-bit is set
when the measured value of this parameter exceeds its configured
maximum threshold. The A bit is cleared when the measured value
falls below its configured reuse threshold. If the A-bit is clear,
the sub-TLV represents steady state link performance.
RESERVED. This field is reserved for future use. It MUST be set to
0 when sent and MUST be ignored when received.
Bandwidth Utilization. This field carries the bandwidth utilization
on a link, forwarding adjacency, or bundled link in IEEE floating
point format with units of bytes per second. For a link or
forwarding adjacency, bandwidth utilization represent the actual
utilization of the link (i.e.: as measured in the router). For a
bundled link, bandwidth utilization is defined to be the sum of the
component link bandwidth utilization.
5. Announcement Thresholds and Filters 5. Announcement Thresholds and Filters
The values advertised in all sub-TLVs (except Low/High delay and The values advertised in all sub-TLVs (except Low/High delay and
residual bandwidth) MUST represent an average over a period or be residual bandwidth) MUST represent an average over a period or be
obtained by a filter that is reasonably representative of an average. obtained by a filter that is reasonably representative of an average.
For example, a rolling average is one such filter. For example, a rolling average is one such filter.
Low or High delay MAY be the lowest and/or highest measured value Low or High delay MAY be the lowest and/or highest measured value
over a measurement interval or MAY make use of a filter, or other over a measurement interval or MAY make use of a filter, or other
technique to obtain a reasonable representation of a low and high technique to obtain a reasonable representation of a low and high
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12. IANA Considerations 12. IANA Considerations
IANA maintains the registry for the sub-TLVs. IS-IS TE Metric IANA maintains the registry for the sub-TLVs. IS-IS TE Metric
Extensions will require one new type code per sub-TLV defined in this Extensions will require one new type code per sub-TLV defined in this
document. document.
13. Acknowledgements 13. Acknowledgements
The authors would like to recognize Ayman Soliman, Nabil Bitar, David The authors would like to recognize Ayman Soliman, Nabil Bitar, David
McDysan, Les Ginsberg, Edward Crabbe and Don Fedyk for their McDysan, Les Ginsberg, Edward Crabbe, Don Fedyk and Hannes Gredler
contributions. for their contributions.
The authors also recognize Curtis Villamizar for significant comments The authors also recognize Curtis Villamizar for significant comments
and direct content collaboration. and direct content collaboration.
14. References 14. References
14.1. Normative References 14.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
skipping to change at page 16, line 22 skipping to change at page 17, line 18
Engineering in IS-IS", RFC 6119, February 2011. Engineering in IS-IS", RFC 6119, February 2011.
[RFC6374] Frost, D. and S. Bryant, "Packet Loss and Delay [RFC6374] Frost, D. and S. Bryant, "Packet Loss and Delay
Measurement for MPLS Networks", RFC 6374, September 2011. Measurement for MPLS Networks", RFC 6374, September 2011.
14.2. Informative References 14.2. Informative References
[I-D.atlas-mpls-te-express-path] [I-D.atlas-mpls-te-express-path]
Atlas, A., Drake, J., Giacalone, S., Ward, D., Previdi, Atlas, A., Drake, J., Giacalone, S., Ward, D., Previdi,
S., and C. Filsfils, "Performance-based Path Selection for S., and C. Filsfils, "Performance-based Path Selection for
Explicitly Routed LSPs", Explicitly Routed LSPs using TE Metric Extensions",
draft-atlas-mpls-te-express-path-02 (work in progress), draft-atlas-mpls-te-express-path-04 (work in progress),
February 2013. September 2013.
[I-D.ietf-alto-protocol] [I-D.ietf-alto-protocol]
Alimi, R., Penno, R., and Y. Yang, "ALTO Protocol", Alimi, R., Penno, R., and Y. Yang, "ALTO Protocol",
draft-ietf-alto-protocol-16 (work in progress), May 2013. draft-ietf-alto-protocol-20 (work in progress),
October 2013.
[RFC6375] Frost, D. and S. Bryant, "A Packet Loss and Delay [RFC6375] Frost, D. and S. Bryant, "A Packet Loss and Delay
Measurement Profile for MPLS-Based Transport Networks", Measurement Profile for MPLS-Based Transport Networks",
RFC 6375, September 2011. RFC 6375, September 2011.
Authors' Addresses Authors' Addresses
Stefano Previdi (editor) Stefano Previdi (editor)
Cisco Systems, Inc. Cisco Systems, Inc.
Via Del Serafico 200 Via Del Serafico 200
skipping to change at line 737 skipping to change at page 18, line 34
USA USA
Email: akatlas@juniper.net Email: akatlas@juniper.net
Clarence Filsfils Clarence Filsfils
Cisco Systems, Inc. Cisco Systems, Inc.
Brussels Brussels
Belgium Belgium
Email: cfilsfil@cisco.com Email: cfilsfil@cisco.com
Qin Wu
Huawei
101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China
Email: sunseawq@huawei.com
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