H3C S9500 Series Operation Manual page 212

Operation Manual – MPLS OAM
H3C S9500 Series Routing Switches
II. OAM FFD packets
Like CV packets, you also can verify the LSP connectivity by checking the OAM FFD
packets sent from the ingress node of an LSP arrive at the egress node.
shows the format of the OAM FFD packet.
Compared with a CV packet, a FFD packet has additional 1-byte frequency information.
The transmission frequency is set to 1 second for the CV packet. For the FFD packet,
multiple transmission frequencies are supported, including 10ms, 20ms, 50ms, 100ms,
200ms, and 500ms.
0
Function type (07Hex)
Frequency
Figure 1-2 OAM FFD packet format.
Table 1-2
Table 1-2 Description on the fields of the OAM FFD packet
Function type
Reserved
LSP Trail Termination Source Identifier
Frequency
Padding
BIP16
III. OAM FDI packets
OAM FDI packets are used by the upstream node of an LSP to notify the egress node of
defect information. In addition, when auto protocol is enabled, the ingress node notifies
the egress node with OAM FDI packets that it should stop defect verification.
shows the format of the OAM FDI packet.
7
LSP Trail Termination Source Identifier
(20 octets)
Padding (all 00Hex)
(17 octets)
describes the fields of the OAM FFD packet.
Field
Chapter 1 MPLS OAM Configuration
Reserved (all 00Hex)
BIP16 (2 octets)
Packet type, with 0x07 being the FFD
packet
Reserved field
TTSI. Refer to
Transmission frequency for FFD packet
Padded field
Packet checksum
1-3
Figure 1-2
31
Description
Table 1-1.
Figure 1-3