MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection - PowerPoint PPT Presentation

About This Presentation
Title:

MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection

Description:

MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection Yaacov Weingarten (NSN), Marco Corsi (Altran), Stewart Bryant (Cisco), Bo Wu (ZTE), – PowerPoint PPT presentation

Number of Views:65
Avg rating:3.0/5.0
Slides: 6
Provided by: ietfOrgpro3
Learn more at: https://www.ietf.org
Category:

less

Transcript and Presenter's Notes

Title: MPLS-TP Ring Protection draft-weingarten-mpls-tp-ring-protection


1
MPLS-TP Ring Protectiondraft-weingarten-mpls-tp-r
ing-protection
Yaacov Weingarten (NSN), Marco Corsi
(Altran), Stewart Bryant (Cisco), Bo Wu
(ZTE), Nurit Sprecher (NSN), Xuehui Dai
(ZTE), Daniele Ceccarelli (Ericsson), Diego
Caviglia (Ericsson), Francesco Fondelli (Ericsson)

2
MPLS-TP Criteria for dedicated ring protection
  • MPLS-TP Requirements identifies five criteria for
    defining a special protection mechanism for a
    specific topology
  • Minimize the number of OAM entities needed to
    trigger the protection
  • Minimize the number of recovery objects needed
  • Minimize number of labels required
  • Minimize number of control and management plane
    transactions during a recovery operation
  • In presence of control plane, minimize impact of
    signaling and routing information exchanged
  • Note no requirement has been identified to be
    specific to a ring topology

3
Status of the drafts
  • Merged the following drafts from Hiroshima
  • draft-weingarten-mpls-tp-ring-protection
  • draft-cecarelli-mpls-tp-p2mp-ring
  • draft-yang-mpls-tp-ring-protection
  • draft-liu-mpls-tp-ring-protection
  • draft-dai-mpls-tp-p2mp-ring-protection
  • New version of draft is presented as an
    applicability document
  • Define the problem statement
  • Need to address p2p and p2mp LSPs that cross a
    MPLS-TP ring
  • Need to address both link failure and node
    failure in the ring
  • Show how we can present solutions that are
    dependent upon existing mechanisms without need
    to add any new protocols
  • The proposed solutions that fulfill the
    requirements and achieve the behavior of the
    criteria defined in the TP requirements

4
P2P solution - Steering
  • Trigger switching
  • Run OAM sessions on PST and alternate PST from
    each node to each other node (O(2n) sessions per
    node)
  • Use AIS functionality to notify ingress MEP
  • Ingress node transmits protected traffic on
    working or recovery PST
  • Identical to 11 linear protection, turning the
    ring into a lower layer protected span

C
B
A
D
E
F
Working segment (PST)
Recovery segment (PST)
5
P2MP Option 1 11 protection
  • Replicate data on both the working and recovery
    PST
  • Each node needs to forward packet and examine
    local copy of stack to identify packets to egress
  • Each egress decides on basis of strength of
    signal which data to use
  • No need for coordination between the egress and
    ingress

C
B
A
H
D
E
F
G
Working PST
Recovery PST
Cont Recovery PST
6
P2MP Option 2 ROM FRR
A
  • Optimize wrapping of p2mp by configuring
    alternate paths for each protected element
  • N alternate paths configured for each LSP
  • Support local switching that is wrapped until
    farthest egress
  • Appropriate for specific applications (e.g. Video
    distribution in metro rings)

F
B
DSLAM3
C
E
D
DSLAM2
p2mp working LSP (cw)
p2mp protection LSP (ccw)
7
Action items from Hiroshima
  • Developed applicability draft to propose
    solutions based on existing MPLS survivability
    technologies that
  • Optimize the parameters presented in the TP
    requirements
  • Work within the labeling mechanism of MPLS-TP
  • Current draft unifies the proposals from 5 of the
    drafts that were previously submitted.

8
Next steps
  • Refine the text comments are invited
  • Work toward WG adoption
Write a Comment
User Comments (0)
About PowerShow.com