Matrix N-Series DFE, S-Series
SecureStacks, I-Series, G-Series, D-Series
Connected to a Cisco switch with the intent of forming a 802.3ad Dynamic LAG.
The LAG initially forms; but if the Cisco is restarted (without breaking link) at any time, the LAG drops and does not re-form.
This condition occurs because Enterasys products by default use "long" LAG timers, advertising via the Link Aggregation Control Protocol (LACP) only upon ethernet link and then every 30 seconds thereafter.
When the Cisco comes up and doesn't hear any LACP advertisements, even in the recommended "lacp passive" mode ('
When in some manner the port link state is cycled, LACP is advertised and all is well: LACP on both ends.
Set the Enterasys switch's
Fully reboot either the Cisco or Enterasys device (breaking the link state), or disconnect then reconnect the LAG links.