Dell SmartFabric OS10 User Guide Release 10.5.3

Protocol data units (PDUs) exchange between port channel interfaces to maintain LACP sessions. PDUs are transmitted at either a slow or fast transmission rate, depending on the LACP timeout value. The configured rate interval is used to check whether the partner link is alive or not. The links are ungrouped if three consecutive LACP PDUs are missed. The timeout value depends on the configured rate interval. If the rate interval is fast, the LACP PDUs are sent once every second. If the rate interval is normal, the LACP PDUs are sent once every 30 seconds.

By default, the LACP rate is normal (long timeout). If you configure a fast LACP rate, a short timeout sets.

• Set the LACP rate in CONFIGURATION mode.

  lacp rate [fast | normal]

Configure LACP timeout

OS10(conf-if-eth1/1/29)# lacp rate fast

View port status

OS10# show lacp port-channel

Port-channel 41 admin up, oper up, mode lacp
Actor System ID: Priority 32768, Address e4:f0:04:fe:9f:e1
Partner System ID: Priority 4096, Address de:11:de:11:de:11
Actor Admin Key 41, Oper Key 41, Partner Oper Key 41
Fallback: Not configured, Fallback port preemption: Configured, Fallback timeout: 15 seconds
Fallback Port Elected: 
LACP LAG ID 41 is an aggregatable link
A - Active LACP, B - Passive LACP, C - Short Timeout, D - Long Timeout
E - Aggregatable Link, F - Individual Link, G - IN_SYNC, H - OUT_OF_SYNC,
I - Collection enabled, J - Collection disabled, K - Distribution enabled,
L - Distribution disabled, M - Partner Defaulted, N - Partner Non-defaulted,
O - Receiver is in expired state, P - Receiver is not in expired state
Port ethernet1/1/14 is Enabled, LACP is enabled and mode is lacp
 Actor Admin: State BCFHJKNO Key 20 Priority 32768
     Oper: State BDEGIKNO Key 20 Priority 32768
 Partner Admin: State BCEGIKNP Key 0 Priority 0
     Oper: State BDEGIKNO Key 10 Priority 32768
Port ethernet1/1/16 is Enabled, LACP is enabled and mode is lacp
 Actor Admin: State BCFHJKNO Key 20 Priority 32768
     Oper: State BDEGIKNO Key 20 Priority 32768
 Partner Admin: State BCEGIKNP Key 0 Priority 0
     Oper: State BDEGIKNO Key 10 Priority 32768