H3C S9500 Series Operation Manual - page 4
Operation Manual – MPLS OAM
H3C S9500 Series Routing Switches
Chapter 1 MPLS OAM Configuration
1-3
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.
Figure 1-2
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.
Padding (all 00Hex)
(17 octets)
BIP16 (2 octets)
Function type (07Hex)
Reserved (all 00Hex)
LSP Trail Termination Source Identifier
(20 octets)
0
7
31
Frequency
Figure 1-2 OAM FFD packet format.
Table 1-2
describes the fields of the OAM FFD packet.
Table 1-2 Description on the fields of the OAM FFD packet
Field
Description
Function type
Packet type, with 0x07 being the FFD
packet
Reserved Reserved
field
LSP Trail Termination Source Identifier
TTSI. Refer to
Table 1-1
.
Frequency
Transmission frequency for FFD packet
Padding Padded
field
BIP16 Packet
checksum
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.
Figure 1-3
shows the format of the OAM FDI packet.