Ethernet OAM study in ITU-T SG13, Q.3/13 March 17, 2004...
Transcript of Ethernet OAM study in ITU-T SG13, Q.3/13 March 17, 2004...
1
Ethernet OAM study in ITU-T SG13, Q.3/13
March 17, 2004Hiroshi Ohta
ITU-T SG13, Q.3/13 rapporteur
2
Current status
• Last ITU-T SG13 meeting: Feb. 3-12, 2004• Ethernet OAM requirements: Y.1730
– Approved in Jan. 2004– Aligned with Ethernet architecture study in SG15 (G.8010/G.8011)
• Ethernet OAM mechanisms: Y.17ethoam– Under development– Discussed by people from IEEE 802.1 and MEF also– Progressed the area of maintenance entity and modeling– Worked on dual-bridge model– Clarified the relationships between IEEE 802.1 bridge model
(baggy pants diagram) and ITU-T model (G.805/G.809 model)– Introduced a section on performance monitoring– Applicability where lower layer is not Ethernet phy (e.g., MPLS)– Need feedback from IEEE 802.1 and to be aligned with work here.
3
Maintenance entity (ME)
• OAM target includes multipoint-to-multipoint connectivities• ME is defined for point-to-point connectivities• A multipoint connectivity is handled using a group of MEs.
ETHLink
ETHLink
ETHLink
ETHLink
Service Provider Y
Network Operator BNetwork Operator AUser X User X
UNI NNI UNI
UNI
ETHLink
UNI
ETH
ETH
ETH-CC
ETH-CC
ETH-CC
1
2
3
4
1 2
1 2
1
2
3
4
1 2
1 2
1
2
3 1 2 1 2
3
3
112
2
3
1
2
1
2
1
3
32
3
1
1
12
4
2
4
3
243
3
1
1
12
2
2
3
3 4
4
4
1
21
2
1
21
2
4
Multi-level Ethernet maintenance entities
ETH_TFPETH_FP ETH_FP
ETHFPPLink ETH_FP ETH_FP
ETHFPPLink
Service ProviderNetwork Operator BNetwork Operator ACE
UNI NNI
ETH_FPETH_TFPETH_FP
ETHFPPLink
CE
UNI
CustomerEquipment
CustomerEquipment
Operator ABridges
Operator BBridges
1 2 3 4 5 6 7 8 9
ETH
ETH orSRV
ETH_TFPETH_FP ETH_FP
ETHFPPLink ETH_FP ETH_FP
ETHFPPLink
Service ProviderNetwork Operator BNetwork Operator ACE
UNI NNI
ETH_FPETH_TFPETH_FP
ETHFPPLink
CE
UNI
CustomerEquipment
CustomerEquipment
Operator ABridges
Operator BBridges
1 2 3 4 5 6 7 8 9
ETH_TFPETH_FP ETH_FP
ETHFPPLink ETH_FP ETH_FP
ETHFPPLink
Service ProviderNetwork Operator BNetwork Operator ACE
UNI NNI
ETH_FPETH_TFPETH_FP
ETHFPPLink
CE
UNI
CustomerEquipment
CustomerEquipment
Operator ABridges
Operator BBridges
ETH_TFPETH_FP ETH_FP
ETHFPPLink ETH_FP ETH_FP
ETHFPPLink
Service ProviderNetwork Operator BNetwork Operator ACE
UNI NNI
ETH_FPETH_TFPETH_FP
ETHFPPLink
CE
UNI
ETH_TFPETH_FP ETH_FP
ETHFPPLink ETH_FP ETH_FP
ETHFPPLink
Service ProviderNetwork Operator BNetwork Operator ACE
UNI NNI
ETH_FPETH_TFPETH_FP
ETHFPPLink
CE
UNI
CustomerEquipment
CustomerEquipment
Operator ABridges
Operator BBridges
1 2 3 4 5 6 7 8 9
ETH
ETH orSRV
Provides OAM capabilities for network operators (link and edge-to-edge), service providers and users
5
MEP and MIP models using G.805/G.809
ETHS
CCRDI
CCRDIAIS
FDI
MEP symbol
ETH_FP
ETH_FP
ETHD
LBTR
LBTR
ETH_FP
MIPsymbol
ETHD
LBTR
LBTR
ETH_FP
ETHD
LBTR
LBTR
ETH_FP
ETH_FP
MEP: Maintenance End Point
MIP: Maintenance Intermediate model
6
OAM (Connectivity Monitering) shim in the baggy pants model
LLC
Higher Layer Entities
802.1agUp CMShim
Relay
802.3
LLC LLCLLC
802.1agDownCMShim
MAC Dependent Functions
802.1Q Tagging “Y” Selected CM
frames
All otherframes
LLC
Higher Layer Entities
802.1agUp CMShim
RelayRelay
802.3
LLC LLCLLC
802.1agDownCMShim
MAC Dependent Functions
802.1Q Tagging “Y” Selected CM
frames
All otherframes
7
Baggy pants model and G.805/G.809 notation
802.1Q Tagging “Y”80
2.1Q
Tag
ging
“Y”
LLCHigher Layer Entities
LLC LLC
802.
1ag
Up
CM
Shi
m
802.
1ag
Dow
n C
M S
him
802.1ag Up C
M Shim
802.1ag Dow
n CM
Shim
LLCLLC LLC
D
D
D
S
D
S
MIP
MEP
MEP
D
D
D
S
D
S
D
SMEP
MIP
MEP
MEP
RelayRelay
S
DMEP
D
SMEP
D
SMEP
Some MEPs or MIPs may not be activated depending on the location of the bridge.
8
Dual-relay model with service bundling
CustomerEquipment
CustomerEquipment
Operator ABridges
Operator BBridges
ETH
1 2a 2b 3 4 5 6b 6a 7
11122122
11122122
1020
C-Tag
S-Tag
Untagged
C-Tag
CustomerEquipment
CustomerEquipment
Operator ABridges
Operator BBridges
ETH
1 2a 2b 3 4 5 6b 6a 7
11122122
11122122
1020
C-Tag
S-Tag
Untagged
C-Tag
2a, 6a: peer customer L2CP protocols, multiplex user flow2b, 6b: accommodate multiplexed user flow into a VLAN
9
Application example to Ethernet over MPLS
Eth Access
MPLS CoreMPLS Access
Customer CustomerService Provider
Customer Domain OAM
Provider Domain OAM
Operator Domain OAM Operator Domain OAM
Operator Domain OAM
bridge/bridge equivalent … OAM MEP/MIP
10
Looking into more details …
Customer Domain
Provider Domain
Operator Domain Operator Domain
Operator Domain
Eth Access MPLS Core MPLS Access
Customer CustomerService Provider
MPLS Domain MPLS Domain
Maintenance PointIntermediate Point
Network OAM
Service OAM
PW/MPLS OAM
11
Other topics
• Y.17ethps: Ethernet protection switching– Started developing a draft Recommendation– Requirements to fast protection switching was
included– Mechanisms which should be used for fast
protection is for further study (e.g., link aggregation or new one)
• Y.ethperf: Ethernet performance– Studied within Q.6/13 jointly with Q.3/13
12
Summary and Future ITU-T meetings
• SG13, Q.3/13 is working on Ethernet OAM• Would like to have feedbacks from IEEE
802.1• Need alignment and cooperation with IEEE
802.1 and MEF• Future ITU-T meetings
– Interim: June 7-11 in Geneva– Additional interim: September ?– SG13 plenary: Nov. 30 – Dec. 10 in Geneva