Joint IEEE-SA and ITU Workshop on Ethernet
ITU-T G-Series Supplement 52 Overview
 G.8032 Usage and Operational Considerations
Marc Holness,
Product Line Architect,
Ciena
Geneva, Switzerland, 13 July 2013
Supplement 52 to ITU-T G-series
Recommendation
Provides supplemental information to Ethernet Ring
Protection (ERP) Recommendation ITU-T G.8032
Ethernet services support
Ring interconnections
Network applications
Guidelines for configuration and management procedures
Multiple Ethernet ring protection instances protection
switching
End-to-end network/service resiliency involving G.8032
Geneva, Switzerland, 13 July 2013
2
G.8032 Overview
G.8032 is an Ethernet ring protection protocol:
Provides efficient network connectivity
Provides rapid service restoration (sub 50ms protection)
Provides ring interconnections
Provides localized service restoration from a network fault
Utilizes standard IEEE 802.1Q (bridging) and IEEE 802.3
(MAC)
Is client and server layer agnostic
Supports operator commands (e.g., manual/force switch, do
not revert, clear, etc.)
Geneva, Switzerland, 13 July 2013
3
G.8032 Basic Concepts
A G.8032 ring is simply a logical construct that provides
resiliency over a “closed loop” formed over a physical network
infrastructure
Multiple ERP instances (e.g., virtual rings) can be provided over
a single G.8032 [logical] ring
Logical Ring 1  {A, B, G}
B
Virtual RingRing-1
(R-APS & Data Channels)
G
A
Virtual RingRing-2
(R-APS & Data Channels)
Logical Ring 2  {B, C, D, E, F, G}
:
D
C
B
Virtual RingRing-N
F
G
(R-APS & Data Channels)
Logical Ring 3  {A, B, C, D, E, F, G}
C
D
G
F
B
D
C
B
A
:
E
E
E
F
G
over physical network
infrastructure
C
D
B
A
Logical Ring created
E
G
F
Physical Network
H
4
G.8032 Support of E-LINE Services
A 2-node G.8032 ring can provide linear protection
switching in support of E-LINE services
MAC learning can be enabled or disabled on the ring nodes
C
D
C
CE1
CE2
A
B
G.8032
F
E
1+1 Linear Protection
Geneva, Switzerland, 13 July 2013
D
CE1
CE2
A
B
G.8032
F
E
1:1 Linear Protection
5
G.8032 Support of E-TREE Services
G.8032 can act as a server layer providing resiliency
(sub-50ms protection switching) for an E-TREE
service
CE2
CE2
C
C
CE1
CE3
A
B
G.8032
D
Root (A)  Leaf nodes
Geneva, Switzerland, 13 July 2013
CE1
CE3
A
CE4
B
G.8032
D
CE4
Leaf  Root (A)
6
G.8032 Support of E-LAN Services
G.8032 [naturally] supports services with a
multipoint topology (e.g., E-LAN services)
CE13
CE14
CE13
CE14
C
D
C
D
CE15
CE10
A
CE1
CE2
A
B
G.8032
B
G.8032
CE10
VR-1
F
F
E
E
VR-2
CE11
CE12
Geneva, Switzerland, 13 July 2013
CE11
CE12
7
G.8032 Ring Interconnections
G.8032 defines two ring constructs {major-rings and
sub-rings} which can be interconnected (much like
“LEGO building blocks”)
A
B
Ring
G
Ring1
Service
Provider
Network Y
Ring2
SubSub-Ring
C
D
Ring1
SubSub-Ring
Ring2
E
Service
Provider
Network X
Ring
NOTE:
NOTE: The sub-ring in this case
must be configured with
the R-APS virtual channel.
F
SubSub-Ring1
SubSub-Ring2
SubSub-Ring
Network
(e.g., MPLS, MPLSMPLS-TP, VPLS, PBBPBBTE, xSTP,
xSTP, etc.)
NOTE: Network loop freeness of active
forwarding path is maintained (during
normal state and during all protection
switching events) for all
interconnection scenarios.
8
G.8032 Network Applications
G.8032 (with ring interconnection capabilities) can
provide resilient (sub-50ms) service restoration for
various network applications
Site-to-site Layer 2 VPNs
Ethernet Private Line
Wholesale Ethernet access
3G/4G cell site Mobile Backhaul
Ethernet access to IP services
Delivery of Private Cloud services
Residential services
Geneva, Switzerland, 13 July 2013
G.8032
(Access)
G.8032
(Metro /
Aggregation)
Metro
Transport
G.8032
(Access)
9
G.8032 Introduction of New Node
C
A
D
C
B
G.8032
A
D
A
F
5)
6)
C
B
A
E
FS cleared at nodes A and E
G.8032 ring reverts back to
normal
F
4)
2)
Fiber providing connection
between nodes A & E
disconnected
D
C
B
G.8032
B
G.8032
E
FS applied at node A and E
D
G.8032
A
D
E
1)
C
B
G.8032
E
C
A
E
Fiber connected between AF and E-F
B
G.8032
F
3)
D
E
New node (F) inserted 10
G.8032 End-to-end Resiliency
G.8032 can act as a server
layer providing rapid (sub50ms) protection for higher
layer protocols (e.g.,
G.8031, MPLS-TP, etc.)
Client Layer
Protection
G.8032 Server Layer
G.8032 can also provide
Resilient dual-homed
interconnect via a sub-ring
interconnect of a non-ERP
node (that is based on a
standard L2 bridge)
Service restoration when a
non-ERP node (that is
based on a standard L2
bridge) is participating in
the ring
Physical Infrastructure
A
A
11
Summary
Supplement 52 to ITU-T G-series Recommendations
provides supplemental information to
Recommendation ITU-T G.8032/Y.1344 (Ethernet
ring protection switching)
Ethernet services support
Ring interconnections
Network applications
Guidelines for configuration and management procedures
Multiple Ethernet ring protection instances protection
switching
End-to-end network/service resiliency involving G.8032
Approved September 2012
Geneva, Switzerland, 13 July 2013
12