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RFC 5884, "Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)", June 2010

Source of RFC: bfd (rtg)

Errata ID: 5085

Status: Reported
Type: Technical

Reported By: Balaji Rajagopalan
Date Reported: 2017-08-11

Section 6 says:

The egress LSR MAY respond with an LSP Ping Echo
reply message that carries the local discriminator assigned by it for
the BFD session.

It should say:

The egress LSR MUST respond with an LSP Ping Echo reply message that
MAY carry the local discriminator assigned by it for the BFD session.

Notes:

It is not clear from the original text which of the following is optional:
- The egress MUST send a reply, but the discriminator in the reply is optional
- The reply itself is optional

Technically, the reply cannot be optional, because the egress needs to report LSP-Ping verification status to the ingress.

The proposed text recommends to include BFD discriminator in the reply. This was the intent of the original text.

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