HP Procurve 2810 switches do not appear to support the LLDP fast-start option even on the latest firmware (N.11.52 at present)
From the Manual pages:
"An LLDP-MED device connecting to a switch port may use the data contained in the MED TLVs from the switch to configure itself. However, the lldp refresh-interval setting (default: 30 seconds) for transmitting advertisements can cause an unacceptable delay in MED device configuration.
To support rapid LLDP-MED device configuration, the lldp ast-start-count command temporarily overrides the refresh-interval setting for the fast-start-count advertisement interval. This results in the port initially advertising LLDP-MED at a faster rate for a limited time. Thus, when the switch detects
a new LLDP-MED device on a port, it transmits one LLDP-MED advertisement per second out the port for the duration of the fast-start-count interval."
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