MPLSTP Ring Protection draftweingartenmplstpringprotection draftceccarellimplstpp2mpring

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MPLSTP Ring Protection draftweingartenmplstpringprotection draftceccarellimplstpp2mpring

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MPLS-TP Ring Protection. draft-weingarten-mpls-tp-ring-protection. draft-ceccarelli-mpls-tp-p2mp-ring. Yaacov Weingarten (yaacov.weingarten_at_nsn.com) ... – PowerPoint PPT presentation

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Title: MPLSTP Ring Protection draftweingartenmplstpringprotection draftceccarellimplstpp2mpring

1
MPLS-TP Ring Protectiondraft-weingarten-mpls-tp-r
ing-protectiondraft-ceccarelli-mpls-tp-p2mp-ring
Yaacov Weingarten (yaacov.weingarten_at_nsn.com)
Stewart Bryant (stbryant_at_cisco.com), Nurit
Sprecher (nurit.sprecher_at_nsn.com), Daniele
Ceccarelli (daniele.ceccarelli_at_ericsson.com) Diego
Caviglia (diego.caviglia_at_ericsson.com)
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

Have agreed to merge the current drafts into a
single 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 the
need to add any new mechanisms
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
Conclusions and Next Steps

Develop applicability draft to propose
solutions based on existing MPLS survivability
technologies that
Optimize
The numbers of OAM Sessions,
Number of alternate labels
The bandwidth usage
Work within the labeling mechanism of MPLS-TP
There are still additional (4-5) ring protection
drafts need to unify these with the proposal
some of these are very similar
Invite all authors to
Spend the time to read our ID and check if they
are fine with it
join forces and produce single draft
Final draft to WG draft