Composite%20Transport%20Group%20(CTG)%20Framework%20and%20Requirements%20draft-so-yong-mpls-ctg-framework-requirement-00.txt - PowerPoint PPT Presentation

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Title: Composite%20Transport%20Group%20(CTG)%20Framework%20and%20Requirements%20draft-so-yong-mpls-ctg-framework-requirement-00.txt


1
Composite Transport Group (CTG)Framework and
Requirementsdraft-so-yong-mpls-ctg-framework-requ
irement-00.txt
  • Ning So ning.so_at_verizonbusiness.com
  • Andrew Malis andrew.g.malis_at_verizon.com
  • Dave McDysan dave.mcdysan_at_verizon.com
  • Lucy Yong lucyyong_at_huawei.com

2
Motivation
  • Issues when deploying multiple parallel links in
    MPLS backbone
  • Aggregated link utilization is not efficient
  • Some links many be congested while others stay
    near empty
  • Operators do not have enough ability to control
    the traffic flows under this network environment
  • Inefficiency/Inflexibility of Logical Interface
    Bandwidth Allocation
  • Ship-in-the-night mode when using multiple
    logically-separated routing instances in single
    physical router
  • Draft provides
  • Problem statement in todays IP/MPLS network
  • Composite Transport Group Framework
  • Composite Transport Group Requirments
  • Objective
  • Develop an aggregated traffic transport method
    over multilink trunk to resolve the problems
    todays MPLS enabled network

3
Issue when using multi parallel links
  • Hashing
  • Assume network transporting large amount of micro
    flows with similar bandwidth requirements
  • It does not work under the following operating
    conditions
  • Large portion of the customer traffic are
    encrypted so the in coming flows cannot be broken
    down into micro flows
  • Some machine-to-machine traffic flows are at
    ultra-high rate
  • Multiple parallel trunks have different
    bandwidth, interface types, and/or latencies
  • Assigning individual LSPs to links using planning
    tool
  • Bypass tunnel bandwidth for LSPs are often set to
    near 0 to free up backbone bandwidth for other
    traffic
  • During the network failure congestion may happen
    on some of the parallel trunks while others are
    almost empty
  • Facility Protection
  • Require a dedicated link for protection. No
    protection sharing when using multiple links and
    unwanted link performance degradation

4
Issue when using multi parallel links (2)
  • Existing technology leads to poor link
    utilization or poor performance.
  • Without per-flow TE information, LDP network has
    even more problem utilizing multiple parallel
    backbone trunk efficiently
  • Carriers forced to deploy single higher capacity
    link, which is more expensive, and often not
    widely available.
  • Multiple logically-separate routing instances in
    a single physical router
  • Sharing common parallel backbone when aggregated
    traffic exceeds a single link becomes impossible
    due to the ship-in-the-night operating condition
  • Delicate physical link for each routing instance
    is not efficient
  • Delicate link capacity for each routing instance
    limits carrying a high rate of flows

5
Composite Transport Group (CTG)
  • CTG is the method to transport aggregated traffic
    over a composite link
  • Composite Link is defined in ITU-T Q12 G.800
  • Contain multiple component links supported by
    separate server layer trails
  • Transport over a composite link may not preserve
    the symbol sequence
  • CTG is a local traffic engineering and transport
    selection technology
  • Give traffic engineering among component links
  • Provide component link recovery
  • Auto flow measurement

6
CTG Framework
  • CTG creates CTG connections on the composite link
  • CTG connection must have assigned BW and is
    eligible to transport on any component link
  • LSP, LDP or IP traffic is mapped to CTG
    connections
  • CTG connection TE can be derived from LSP TE or
    from auto BW measurement
  • CTG selects one component link to transport an
    CTG connection based on TE of CTG connections and
    component link condition
  • The selection may change due to component failure
    or CTG connection condition changes

Note To reduce auto BW measurement burden, it is
expected that LDP and IP traffic is in small
amount.
7
Requirements for CTG
  • Draft specifies the set of requirements for CTG
    in IP/MPLS environment
  • Like to get other carrier inputs on the
    requirements
  • Like to know people interest in working on it
  • Next Step
  • Use this draft as the CTG starting work in WG
  • Plan to roll out the solution draft prior to next
    meeting

8
Acknowledgement
  • Many Thanks to
  • Frederic Jounay from France Telecom
  • Adrian Farrel from Olddog
  • Ron Bonica from Juniper
  • For the reviews and great suggestions.
  • Feedbacks and comments are welcome
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