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1 802.1ag Discussion May 18, 2004 Ali Sajassi Paul Bottorf

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1 ag Discussion May 18, 2004 Ali Sajassi Paul Bottorf

2 222 Where are we ? We have come along a long way since first preso on this topic to group was made a year ago (June 2003) Since then, lots of work has been done in ITU and MEF Since then, many presentations/contributions (in coordination with ITU & MEF) have been made on this topic to this group Since then, a PAR has been approved

3 333 Whats the Scope ? The following Connectivity Fault Management functionality -Fault Detection: Continuity Check -Fault Verification: Loop Back -Fault Isolation: Trace Route Concept of Domain & Domain Level Concept of Maintenance Entity -Maintenance End Point (MEP) -Maintenance Intermediate Point (MIP)

4 444 Whats outside of the Scope ? Performance Management Functionality such as - Frame Loss Measurement - Delay Measurement - Delay Variation Measurement - Availability Measurement Connectivity Fault Indication such as AIS and alarm suppression ? Connectivity Fault Recovery (it is assumed to be taken care by xSTP) – e.g., not intention to do protection switching here

5 555 Whats need to be decided ? Where to put the Maintenance Entity - What functionality is needed at different MAC sub- layers - What functionality is needed at LLC level - How to model a bridge Domain Level - Absolute versus Relative - Multicast versus Unicast traffic

6 666 Maintenance Entity 802.1ad defines three types of services - Port based - VLAN based - VLAN bundling ITU defined Maintenance Points based on IEEE Provider Bridge models for the above services Now need to define IEEE bridge model(s) for these Maintenance Points

7 777 Port-based Service C-Tag

8 Q Tagging Y Provider Bridge: S-VLAN aware component - 2b LLC Higher Layer Entities LLC 802.1ag Up CM Shim 802.1ag Down CM Shim 802.1ag Up CM Shim802.1ag Down CM Shim Relay LLC MEP MIP

9 999 C-Tag VLAN Bundling Service

10 Q Tagging Y C-VLAN aware Component – 2a LLC Higher Layer Entities LLC 802.1ag Up CM Shim 802.1ag Down CM Shim 802.1ag Up CM Shim802.1ag Down CM Shim Relay LLC MIP MEP MIP MEP MIP MEP MIP MEP

11 Q Tagging Y S-VLAN aware component – 2b LLC Higher Layer Entities LLC 802.1ag Up CM Shim 802.1ag Down CM Shim 802.1ag Up CM Shim802.1ag Down CM Shim Relay LLC MEP MIP MEP MIP

12 12 Different ways of Implementing ITU models 1.Bridge Brain LLC 2.Bridge Port LLC 3.Bridge Port MAC sub-layer

13 13 Bridge Brain LLC

14 14 Bridge Port LLC

15 15 Bridge Port MAC sub-layer

16 ad Model

17 ag Model – Which one ?


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