Satoshi NARIKAWA NTT (G.8032 Acting Co-editor) Joint ITU-T/IEEE Workshop on The Future of Ethernet Transport (Geneva, 28 May 2010) G.8032 : Ethernet Ring protection characteristics, architectures and the Ring APS protocol Satoshi NARIKAWA NTT (G.8032 Acting Co-editor) Geneva, 28 May 2010

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 2

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 3

Objectives and Principles Protection switching on Ethernet layer Use of Ethernet OAM frames called R-APS message for protection behavior Preventing any loops by blocking mechanism VLAN based protection switching Sub-50msec protection switching Support of administrative commands Geneva, 28 May 2010 4

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 5

Basic protection mechanism R-APS(SF) A B A B A B F C F C F C E D E D E D R-APS(SF) Normal condition Block RPL (Ring Protection Link) Failure condition Block failed link Send R-APS messages Unblock RPL Perform FDB flush on all ring node as needed Geneva, 28 May 2010 6

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 7

G.8032 (06/2008) Revision approved in June 2008 Supported Features Single ring protection Revertive behavior State based flush logic Ring Geneva, 28 May 2010 8

G.8032 (04/2009) Amendment approved in April 2009 Supported Features Multi-ring protection with R-APS Virtual Channel Revertive behavior State based flush logic Flush propagation Major Major Major Sub Sub Sub Geneva, 28 May 2010 9

G.8032 (03/2010) Revision approved in March 2010 Supported Features Multi-ring protection with/without R-APS Virtual Channel Revertive/non-revertive behavior Flush logic with Node-ID and BPR (Blocked Port Reference) mechanism Administrative commands (Manual/Forced switch, Clear) Ability to block RPL at both ends of link Multiple (logical) ERP Instances over a given physical ring Major Major Major Major Sub Sub Sub Sub Sub Geneva, 28 May 2010 10

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 11

Interconnected Rings G.8032 supports for a network of interconnected rings based on the following terminology. Interconnection Node connects between Ethernet rings Major Ring constitutes a closed ring is controlled by its own ERP instance with its own RPL Sub-Ring is connected to a Major Ring or upper Sub-Ring via the Interconnection Nodes and does not constitute a closed ring Major Major Sub Sub Major Major Sub Sub Major Sub Sub Geneva, 28 May 2010 12

R-APS Virtual Channel The 2010 version supports two implementation options for R-APS control channel of the Sub-Ring. with R-APS Virtual Channel without R-APS Virtual Channel In the first option, R-APS messages are encapsulated and transmitted over an R-APS Virtual Channel configured on the Major Ring. In the second option, R-APS messages are terminated at the Interconnection Nodes but not blocked at RPL of the Sub-Ring. R-APS Virtual Channel Major Major Major Major R-APS Channel Sub Sub Sub Sub Physical Ring R-APS Channel of Major Ring R-APS Channel of Sub-Ring with R-APS Virtual Channel R-APS Channel of Sub-Ring without R-APS Virtual Channel Geneva, 28 May 2010 13

Administrative commands New revision supports basic operator administrative commands Forced Switch (FS) – allows operator to block a particular ring port Effective even if there is existing SF condition Multiple FS commands supported per ring May be used to allow immediate maintenance operations Manual Switch (MS) Not effective if existing FS or SF condition Overridden by new FS and SF conditions New MS commands are ignored Clear – cancels an existing FS/MS command on the ring port May be used (at RPL Owner Node) to trigger reversion Geneva, 28 May 2010 14

Multiple ERP instances New revision supports multiple ERP instances ERP instance is composed of a set of VLANs. Multiple ERP instances can be configured on a same physical ring. ERP instance protects a subset of the VLANs that transport traffic over the physical ring. Each ERP instance is independent of other ring instances. Instance 1 Instance 2 Geneva, 28 May 2010 15

R-APS message R-APS message format (based on Y.1731 APS) Geneva, 28 May 2010 16

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 17

Dual node interconnection Future work item 1 End-to-end service resiliency Resilient metro/core network can be realized by G.8032v2, but access network is not yet supported by ring protection. Guidelines for providing end-to-end resilient service are under study. Access network G.8032 Dual node interconnection Access network Geneva, 28 May 2010 18

Future work item 2 Multiple failure recovery In some cases, ring segmentation occurs due to multiple failures. Guidelines for a mechanism to minimize its effect are under study. The 2010 version under study Major Major Major Major Sub Sub Sub Sub Normal condition Single failure condition Double failure condition Moving blocked link Geneva, 28 May 2010 19

Other future work items Reduced consumption of VIDs Method to reduce the number of VIDs allocated for R-APS control channel FDB Flush optimization Method to minimize the effect of flooding in case of protection switching or reversion Geneva, 28 May 2010 20

Objectives and Principles Basic protection mechanism Revision notes Outline Objectives and Principles Basic protection mechanism Revision notes Detailed functionality Future work Summary Geneva, 28 May 2010 21

Summary G.8032 provides resilient Ethernet network by using ring architecture. The 2010 version supports multi-ring protection switching with functionality such as: Revertive/non-revertive mode Administrative commands Multiple ERP instances etc… Some additional topics are under study including: End-to-end service resiliency Multiple failure recovery Geneva, 28 May 2010 22

Thank you