draft-ietf-ccamp-rsvp-te-bandwidth-availability-08.txt   draft-ietf-ccamp-rsvp-te-bandwidth-availability-09.txt 
Network Working Group H. Long, M. Ye Network Working Group H. Long, M. Ye
Internet Draft Huawei Technologies Co., Ltd Internet Draft Huawei Technologies Co., Ltd
Intended status: Standards Track G. Mirsky Intended status: Standards Track G. Mirsky
ZTE ZTE
A.D'Alessandro A.D'Alessandro
Telecom Italia S.p.A Telecom Italia S.p.A
H. Shah H. Shah
Ciena Ciena
Expires: July 2018 January 30, 2018 Expires: January 2019 July 24, 2018
Ethernet Traffic Parameters with Availability Information Ethernet Traffic Parameters with Availability Information
draft-ietf-ccamp-rsvp-te-bandwidth-availability-08.txt draft-ietf-ccamp-rsvp-te-bandwidth-availability-09.txt
Abstract Abstract
A Packet switching network may contain links with variable bandwidth, A Packet switching network may contain links with variable bandwidth,
e.g., copper, radio, etc. The bandwidth of such links is sensitive e.g., copper, radio, etc. The bandwidth of such links is sensitive
to external environment. Availability is typically used for to external environment. Availability is typically used for
describing the link during network planning. This document describing the link during network planning. This document
introduces an optional Availability TLV in Resource ReSerVation introduces an optional Availability TLV in Resource ReSerVation
Protocol - Traffic Engineer (RSVP-TE) signaling. This extension can Protocol - Traffic Engineer (RSVP-TE) signaling. This extension can
be used to set up a Label Switched Path (LSP) in a Packet Switched be used to set up a Label Switched Path (LSP) in a Packet Switched
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Internet-Drafts are draft documents valid for a maximum of six Internet-Drafts are draft documents valid for a maximum of six
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This Internet-Draft will expire on July 30, 2018. This Internet-Draft will expire on January 24, 2019.
Copyright Notice Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
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publication of this document. Please review these documents publication of this document. Please review these documents
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LSA Link State Advertisement LSA Link State Advertisement
1. Introduction 1. Introduction
The RSVP-TE specification [RFC3209] and GMPLS extensions [RFC3473] The RSVP-TE specification [RFC3209] and GMPLS extensions [RFC3473]
specify the signaling message including the bandwidth request for specify the signaling message including the bandwidth request for
setting up a Label Switched Path in a PSN network. setting up a Label Switched Path in a PSN network.
Some data communication technologies allow seamless change of Some data communication technologies allow seamless change of
maximum physical bandwidth through a set of known discrete values. maximum physical bandwidth through a set of known discrete values.
The parameter availability [G.827], [F.1703], [P.530] is often used The parameter availability [G.827], [F.1703], [P.530] is often used
to describe the link capacity during network planning. The to describe the link capacity during network planning. The
availability is a time scale, which is a proportion of the operating availability is a time scale, which is a proportion of the operating
time that the requested bandwidth is ensured. A more detailed time that the requested bandwidth is ensured. A more detailed
example on the bandwidth availability can be found in Appendix A. example on the bandwidth availability can be found in Appendix A.
Assigning different availability classes to different types of Assigning different availability classes to different types of
service over such kind of links provides more efficient planning of service over such kind of links provides more efficient planning of
link capacity. To set up an LSP across these links, availability link capacity. To set up an LSP across these links, availability
information is required for the nodes to verify bandwidth information is required for the nodes to verify bandwidth
satisfaction and make bandwidth reservation. The availability satisfaction and make bandwidth reservation. The availability
information should be inherited from the availability requirements information should be inherited from the availability requirements
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2. Overview 2. Overview
A PSN tunnel may span one or more links in a network. To setup a A PSN tunnel may span one or more links in a network. To setup a
Label Switched Path (LSP), a node may collect link information which Label Switched Path (LSP), a node may collect link information which
is spread in routing message, e.g., OSPF TE LSA message, by network is spread in routing message, e.g., OSPF TE LSA message, by network
nodes to get to know about the network topology, and calculate out nodes to get to know about the network topology, and calculate out
an LSP route based on the network topology, and send the calculated an LSP route based on the network topology, and send the calculated
LSP route to signaling to initiate a PATH/RESV message for setting LSP route to signaling to initiate a PATH/RESV message for setting
up the LSP. up the LSP.
In case that there is(are) link(s) with variable discrete bandwidth In case that there is (are) link(s) with variable discrete bandwidth
in a network, a <bandwidth, availability> requirement list should be in a network, a <bandwidth, availability> requirement list should be
specified for an LSP. Each <bandwidth, availability> pair in the specified for an LSP. Each <bandwidth, availability> pair in the
list means that listed bandwidth with specified availability is list means that listed bandwidth with specified availability is
required. The list could be inherited from the results of service required. The list could be inherited from the results of service
planning for the LSP. planning for the LSP.
A node which has link(s) with variable discrete bandwidth attached A node which has link(s) with variable discrete bandwidth attached
should contain a <bandwidth, availability> information list in its should contain a <bandwidth, availability> information list in its
OSPF TE LSA messages. The list provides the mapping between the link OSPF TE LSA messages. The list provides the mapping between the link
nominal bandwidth and its availability level. This information is nominal bandwidth and its availability level. This information is
used for path calculation by the node(s). The routing extension for used for path calculation by the node(s). The routing extension for
availability can be found in [ARTE]. availability can be found in [RFC8330].
When a node initiates a PATH/RESV signaling to set up an LSP, the When a node initiates a PATH/RESV signaling to set up an LSP, the
PATH message should carry the <bandwidth, availability> requirement PATH message should carry the <bandwidth, availability> requirement
list as bandwidth request. Intermediate node(s) will allocate the list as bandwidth request. Intermediate node(s) will allocate the
bandwidth resource for each availability requirement from the bandwidth resource for each availability requirement from the
remaining bandwidth with corresponding availability. An error remaining bandwidth with corresponding availability. An error
message may be returned if any <bandwidth, availability> request message may be returned if any <bandwidth, availability> request
cannot be satisfied. cannot be satisfied.
3. Extension to RSVP-TE Signaling 3. Extension to RSVP-TE Signaling
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2005. 2005.
[P.530] ITU-R Recommendation," Propagation data and prediction [P.530] ITU-R Recommendation," Propagation data and prediction
methods required for the design of terrestrial line-of- methods required for the design of terrestrial line-of-
sight systems", February, 2012 sight systems", February, 2012
[EN 302 217] ETSI standard, "Fixed Radio Systems; Characteristics [EN 302 217] ETSI standard, "Fixed Radio Systems; Characteristics
and requirements for point-to-point equipment and and requirements for point-to-point equipment and
antennas", April, 2009 antennas", April, 2009
[ARTE] H., Long, M., Ye, Mirsky, G., Alessandro, A., Shah, H., [RFC8330] H., Long, M., Ye, Mirsky, G., Alessandro, A., Shah, H.,
"OSPF Routing Extension for Links with Variable Discrete "OSPF Traffic Engineering (OSPF-TE) Link Availability
Bandwidth", Work in Progress, October, 2016 Extension for Links with Variable Discrete Bandwidth",
RFC8330, February, 2018
7. Appendix: Bandwidth Availability Example 7. Appendix: Bandwidth Availability Example
In mobile backhaul network, microwave links are very popular for In mobile backhaul network, microwave links are very popular for
providing connection of last hops. In case of heavy rain, to providing connection of last hops. In case of heavy rain, to
maintain the link connectivity, the microwave link MAY lower the maintain the link connectivity, the microwave link MAY lower the
modulation level since demodulating the lower modulation level needs modulation level since demodulating the lower modulation level needs
a lower Signal-to-Noise Ratio (SNR). This is called adaptive a lower Signal-to-Noise Ratio (SNR). This is called adaptive
modulation technology [EN 302 217]. However, a lower modulation modulation technology [EN 302 217]. However, a lower modulation
level also means lower link bandwidth. When link bandwidth is level also means lower link bandwidth. When link bandwidth is
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For the 100M bandwidth of the modulation level 1, only the extreme For the 100M bandwidth of the modulation level 1, only the extreme
weather condition can cause the whole system unavailable, which only weather condition can cause the whole system unavailable, which only
happens for 5 minutes in a year. So the 100 Mbps bandwidth of the happens for 5 minutes in a year. So the 100 Mbps bandwidth of the
modulation level 1 owns the availability of 99.999%. modulation level 1 owns the availability of 99.999%.
In a word, the maximum bandwidth is 400 Mbps. According to the In a word, the maximum bandwidth is 400 Mbps. According to the
weather condition, the sub-bandwidth and its availability are shown weather condition, the sub-bandwidth and its availability are shown
as follows: as follows:
Sub-bandwidth(Mbps) Availability Sub-bandwidth (Mbps) Availability
------------------ ------------ ------------------ ------------
200 99.99% 200 99.99%
100 99.995% 100 99.995%
100 99.999% 100 99.999%
8. Acknowledgments 8. Acknowledgments
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