Services Overview
7705 SAR OS Services Guide Page 65
VLAN/dot1p
This is the VLAN dot1p identifier. If null encapsulation is configured (for Ethernet SAPs or
spoke SDP bindings to a VC-type, ether or vlan), the frame is tagged with NULL.
ETH-CFM OAMPDU
The contents of the Ethernet OAMPDU depend on whether dot1ag or Y.1731 standards are
being used. For details on the dot1ag or Y.1731 OAMPDU, see ETH-CFM OAMPDU.
FCS
This is the frame check sequence field.
ETH-CFM OAMPDU
As shown in Figure 11, each ETH-CFM OAMPDU message contains the following fields:
• MD level or MEG level: user-configured value, 0 to 7
• version: current version is 0
• opcodes: as defined in IEEE 802.1ag and Y.1731 standards, for messages such as:
→ Continuity Check Message (CCM)
→ Loopback Message (LBM)
→ Loopback Reply (LBR)
→ Linktrace Message (LTM)
→ Linktrace Reply (LTR)
• flags: as defined in IEEE 802.1ag and Y.1731 standards
• one or more TLVs, which include:
→ End TLV
→ Data TLV
→ Reply Ingress TLV
→ Reply Egress TLV
→ LTM egress identifier TLV
→ LTR egress identifier TLV
→ Test TLV
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