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Published byLeslie Coffey Modified over 11 years ago
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1 802.1ag Discussion May 18, 2004 Ali Sajassi sajassi@cisco.com Paul Bottorf pbottorf@nortelnetworks.com sajassi@cisco.com pbottorf@nortelnetworks.com
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222 Where are we ? We have come along a long way since first preso on this topic to 802.1 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
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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)
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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
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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
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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
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777 Port-based Service C-Tag
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888 802.1Q 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
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999 C-Tag VLAN Bundling Service
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10 802.1Q 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
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11 802.1Q 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
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12 Different ways of Implementing ITU models 1.Bridge Brain LLC 2.Bridge Port LLC 3.Bridge Port MAC sub-layer
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13 Bridge Brain LLC
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14 Bridge Port LLC
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15 Bridge Port MAC sub-layer
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16 802.1ad Model
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17 802.1ag Model – Which one ?
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