Description

Glossary

RFCs

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Obsolete RFCs

Description:

MPLS Echo header:

Version. 16 bits.
Protocol version.

Flags. 15 bits.
MUST be cleared to zero when sending and MUST be ignored on receipt.

V, Validate FEC Stack. 1 bit.
This flag is set to 1 if the sender wants the receiver to perform FEC Stack validation. Otherwise, the choice is left to the receiver.

Type. 8 bits.
Message type.

Mode. 8 bits.
Reply mode.

Code. 8 bits.
Return code.

Subcode. 8 bits.
Return subcode.

Handle. 32 bits.
The handle of the sender. This field is filled in by the sender and returned unchanged by the receiver in the echo reply.

Sequence number. 32 bits.
This field is set by the sender of the Echo request and can be used to detect missed replies.

Timestamp sent seconds. 32 bits.
The seconds component of the time of day in NTP format when the MPLS echo request is sent.

Timestamp sent microseconds. 32 bits.
The microseconds component of the time of day in NTP format when the MPLS echo request is sent.

Timestamp received seconds. 32 bits.
The seconds component of the time of data in NTP format that the corresponding echo request was sent.

Timestamp received microseconds. 32 bits.
The microseconds component of the time of data in NTP format that the corresponding echo request was sent.

TLV, Type-Length-Value tuples:

Type. 16 bits.
Types less than 32768 are mandatory TLVs that MUST either be supported by an implementation or result in the return code of 2 ("One or more of the TLVs was not understood") being sent in the echo response. Types greater than or equal to 32768 are optional TLVs that SHOULD be ignored if the implementation does not understand or support them.

Length. 16 bits.

Value. Variable length.
The data.

Glossary:

RFCs:

[RFC 4379] Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures.

• Category: Standards Track.
• Updates:
  RFC 1122.
• Defines the MPLS Echo version 1 protocol.

Publications:

Obsolete RFCs:

Description

Glossary

RFCs

Publications

Obsolete RFCs