The "v2" designation implies a roadmap. We can anticipate:
In standard MACsec, the Packet Number (PN) is 32 bits. At 100 Gbps, this number can "wrap around" (exhaust all 4.29 billion values) in approximately 5 minutes, requiring a disruptive rekeying process. XPN solves this by expanding the PN to .
: Both the sender and receiver maintain the upper 32 bits internally. The receiver increments its internal upper 32 bits when it detects the transmitted lower 32 bits have rolled over.
Could you tell me this term belongs to?