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MS-PW OAM - draft-dong-pwe3-mspw-oam-01.txt. Jixiong Dong [email protected] Presented by Yang Yang. Requirements of MS-PW OAM. From “Requirements for inter domain Pseudo-Wires”(draft-martini-pwe3-mh-pw-requirements-01.txt): - PowerPoint PPT Presentation
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MS-PW OAM - draft-dong-pwe3-mspw-oam-01.txt
Jixiong Dong [email protected] Presented by Yang Yang
Requirements of MS-PW OAM
From “Requirements for inter domain Pseudo-Wires”(draft-martini-pwe3-mh-pw-requirements-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.
E2E/SEG OAM scheme
PE1 S-PE PE2
SEG1 OAM SEG2 OAM
E2E OAM
PE1 S-PE PE2PW SEG1 PW SEG2
Two Level OAM
FDI scheme
① FDI
PE1 S-PE1 PE2S-PE2PE1 S-PE1 PE2S-PE2
② RDI
② PW status TLV
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.
Distinguishing of E2E OAMand SEG OAM
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.
Inband VCCV Extension
Next step
RDI (Remote Defect Indication)
PW mismatch