MS-PW OAM

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MS-PW OAM - draft-dong-pwe3-mspw-oam-01.txt
Jixiong Dong dongjixiong_at_huawei.com Presented
by Yang Yang
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Requirements of MS-PW OAM
From Requirements for inter domain
Pseudo-Wires(draft-martini-pwe3-mh-pw-requirement
s-01.txt) In-band monitoring SHOULD be provided
both end-to-end across the MS-PW, and on a
segment (i.e. SS-PW) basis. The MS-PW SHOULD
support a Forward Defect Indicator (FDI). All PE
routers along the MS-PW MUST agree on a common PW
OAM mechanism to use to the MS-PW. The S-PE
should be able to behave as a segment endpoint
for PW OAM mechanisms. The S-PE MUST be able to
pass U-PE to U-PE PW OAM messages transparently.
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E2E/SEG OAM scheme
PE2
PW SEG2
PW SEG1
PE1
S-PE
Two Level OAM
PE2
PE1
S-PE
SEG2 OAM
SEG1 OAM
E2E OAM
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FDI scheme
PE2
PE2
PE1
S-PE1
PE1
S-PE1
S-PE2
S-PE2
? FDI
? RDI
? PW status TLV
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OAM capability indication
Total Seven OAM capability 0x01 ICMP Ping
(predefined in VCCV) 0x02 LSP Ping
(predefined in VCCV) 0x04 BFD for PW Fault
Detection only (predefined in VCCV) 0x08 BFD
for PW Fault Detection and AC/PW Fault
Status Signaling (predefined in VCCV)
0x10 FDI 0x20 SEG OAM 0x40 E2E OAM
Problems The length of CV type field is 8 bit,
which limit the number of OAM capability
indication.
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Distinguishing of E2E OAMand SEG OAM
Inband VCCV Extension
T Indicates the segment type of OAM packet.
T 0 indicates it is SEG OAM
packet. T 1 indicates it is E2E OAM
packet. F Indicates the FDI type of OAM
packet. F 0 indicates it is not a
FDI packet. F 1 indicates it is a
FDI packet.
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Next step
RDI (Remote Defect Indication) PW mismatch