H3C S9500 Series Operation Manual - page 3
Operation Manual – MPLS OAM
H3C S9500 Series Routing Switches
Chapter 1 MPLS OAM Configuration
1-2
1.1.2 MPLS OAM Packet Types and Formats
MPLS OAM packets fall into four types: connectivity verification (CV), fast failure
detection (FFD), forward defect indication (FDI) and backward defect indication (BDI).
The following sections present a description of their formats.
I. OAM CV packets
The LSP connectivity is verified by checking that the egress node of an LSP has
received the OAM CV packets sent from the ingress node.
Figure 1-1
shows the format
of the OAM CV packet.
Padding (all 00Hex)
(18 octets)
BIP16 (2 octets)
Function type (01Hex)
Reserved (all 00Hex)
LSP Trail Termination Source Identifier
(20 octets)
0
7
31
Figure 1-1 OAM CV packet format
Table 1-1
describes the fields of the OAM CV packet.
Table 1-1 Description on the fields of the OAM CV packet
Field
Description
Function type
Packet type, with 0x01 being the CV packet
Reserved Reserved
field
LSP Trail
Termination Source
Identifier
TTSI, uniquely identifying an LSP in a network. It consists of
16-byte ingress LSR ID and 4-byte LSP ID. For IPv4, the first
10 bytes of ingress LSR ID are padded with 0x00, the
following two bytes are padded with 0xFF, and the last four
bytes are IPv4 address.
Padding Padded
field
BIP16 Packet
checksum