This mechanism was standardized in IEEE 802.1AEbw-2013 to prevent packet number (PN) exhaustion on high-speed links (100 Gbps and above). Core Mechanism: How XPN Works
Example pseudo-code (simplified):
"expn64v2gcm" does not appear in public technical documentation, software repositories, or standard feature logs. It is likely a unique internal identifier system-generated hash specific configuration string used within a private workspace or proprietary tool expn64v2gcm work
int do_expn64v2_gcm_work(struct gcm_job *job) writeq(job->src, EXPN64V2_SRC_ADDR); writeq(job->dst, EXPN64V2_DST_ADDR); writeq(job->len, EXPN64V2_LEN); writeb(CMD_START, EXPN64V2_CTRL); while(!(readb(EXPN64V2_STATUS) & STATUS_DONE)); return readb(EXPN64V2_TAG_READY); This mechanism was standardized in IEEE 802
To understand "expn64v2gcm," we can reverse-engineer the naming convention likely used by a developer or an automated compiler: while(!(readb(EXPN64V2_STATUS) & STATUS_DONE))