RFC 8469, "Recommendation to Use the Ethernet Control Word", November 2018

Errata ID: 6082
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Michal Dolegowski
Date Reported: 2020-04-09
Held for Document Update by: Deborah Brungard
Date Held: 2020-04-10

Section 3 says:

Thus, if the source MAC address of an Ethernet frame carried over
the PW without a control word present begins with 0x4 or 0x6, it
could be mistaken for an IPv4 or IPv6 packet.  This could,
depending on the configuration and topology of the MPLS network,
lead to a situation where all packets for a given PW do not follow
the same path.

It should say:

Thus, if the destination MAC address of an Ethernet frame carried over
the PW without a control word present begins with 0x4 or 0x6, it
could be mistaken for an IPv4 or IPv6 packet.  This could,
depending on the configuration and topology of the MPLS network,
lead to a situation where all packets for a given PW do not follow
the same path.

Notes:

The first nibble of an Ethernet frame is the first nibble of the destination MAC address, not the source MAC address. The erroneous packet reordering occurs for traffic traveling toward the device with the 0x4... or 0x6... MAC address

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