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Connectivity Fault ManagementNorman FinnConnectivity Fault Management IEEE 802.1 Tutorial, Portland, July 12, 20041DISCLAIMER• IEEE P802.1ag is a work in progress.• Some of the information in this slide deck reflects consensus among IEEE 802.1 and ITU-T Q.3/13 participants.•reflects only the opinions of the author.• Until P802.1ag and/or Y.17ethoam are approved, there is no reliable means for distinguishing opinion from consensus.Connectivity Fault Management IEEE 802.1 Tutorial, Portland, July 12, 2004 222Edge BridgeATM SwitchBridgeBridgeRouterRouterRouterBridgeswitchswitchEdge BridgeWhat is Metro EthernetConnectivity Fault Management?L2“L1”Ethernet Ethernet 10G ATMover SONET over MPLS Ethernet RFC1483• CFM: Standard Ethernet frames, distinguished from ordinary data frames only by destination MAC address and/or EtherType, and seen, relayed, and/or terminated by Provider Bridges.Connectivity Fault Management IEEE 802.1 Tutorial, Portland, July 12, 2004 333IEEE 802.3ah OAM versus802.1ag CFM = ITU-T Q.3/13 EthOAMIEEE 802.3ah OAM Connectivity Fault ManagementMay be per-service or per-wire. Operates on physical link only. Passes “end-to-end” through Cannot pass through a bridge.bridges.Discovery, Variable request & Connectivity Verification, response, Event notification, Traceroute, Ping, (Alarm Information, Loopback mode. Suppression?).Single instantiation per physical Multiple instances operating at link. multiple levels ...
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Norman Finn
Connectivity Fault Management
1
IEEE P802.1ag is a work in progress.
Some of the information in this slide deck reflects consensus among IEEE 802.1 and ITU-T Q.3/13 participants.
Some of the information in this slide deck reflects only the opinions of the author.
Until P802.1ag and/or Y.17ethoam are approved, there is no reliable means for distinguishing opinion from consensus.
DISCLAIMER
10G Ethernet
ATM RFC1483
L1
L2
CFM: Standard Ethernet frames, distinguished from ordinary data frames only by destination MAC address and/or EtherType, and seen, relayed, and/or terminated by Provider Bridges.
What is Metro Ethernet Connectivity Fault Management?
Ethernet over MPLS
Ethernet over SONET
Both are TLV based, both will (likely) allow vendor-specific TLVs.
Multiple instances operating at multiple levels simultaneously.
IEEE 802.3ah OAM
Drafting in progress.
Standard approved by IEEE 802.
Single instantiation per physical link.
Discovery, Variable request & response, Event notification, Information, Loopback mode.
Operates on physical link only. Cannot pass through a bridge.
Connectivity Fault Management May be per-service or per-wire. Passes end-to-end through bridges. Connectivity Verification, Traceroute, Ping, (Alarm Suppression?).
Created by one committee.
Joint effort by IEEE 802.1, ITU-T.
IEEE 802.3ah OAM versus 802.1ag CFM = ITU-T Q.3/13 EthOAM
Customer contracts with Provider for end-to-end service.
Provider contracts with Operator(s) to provide equipment and networks.
ProviderandOperator(s)may or may not be the same company or same division. Connectivity Fault Management IEEE 802.1 Tutorial, Portland, July 12, 2004
5
Provider Domain
Customer Domain
Operator 1 Domain
The View From Above
Physical view of a network using CFM
Operator 2 Domain
Bridges UNIs Links in use Unused Links
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Provider s view from above
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Provider Domain
The View From Above
Operator 1 Domain
Operator 2 Domain
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Physical view from above
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