Dell S4820T, Configuration Manual

Page: 564 / 1178

CONFIG-INT-PO mode
lacp long-timeout
Example of the
lacp long-timeout
and
show lacp
Commands
Dell(conf)# interface port-channel 32
Dell(conf-if-po-32)#no shutdown
Dell(conf-if-po-32)#switchport
Dell(conf-if-po-32)#lacp long-timeout
Dell(conf-if-po-32)#end
Dell# show lacp 32
Port-channel 32 admin up, oper up, mode lacp
Actor System ID: Priority 32768, Address 0001.e800.a12b
Partner System ID: Priority 32768, Address 0001.e801.45a5
Actor Admin Key 1, Oper Key 1, Partner Oper Key 1
LACP LAG 1 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 Te 3/6 is enabled, LACP is enabled and mode is lacp
Actor Admin: State ADEHJLMP Key 1 Priority 128
To view the PDU exchanges and the timeout value, use the
debug lacp
command. For more
information, refer to Monitoring and Debugging LACP .
Monitoring and Debugging LACP
The system log (syslog) records faulty LACP actions.
To debug LACP, use the following command.
• Debug LACP, including configuration and events.
EXEC mode
[no] debug lacp [config | events | pdu [in | out | [interface [in | out]]]]
Shared LAG State Tracking
Shared LAG state tracking provides the flexibility to bring down a port channel (LAG) based on the
operational state of another LAG.
At any time, only two LAGs can be a part of a group such that the fate (status) of one LAG depends on the
other LAG.
As shown in the following illustration, the line-rate traffic from R1 destined for R4 follows the lowest-cost
route via R2. Traffic is equally distributed between LAGs 1 and 2. If LAG 1 fails, all traffic from R1 to R4
flows across LAG 2 only. This condition over-subscribes the link and packets are dropped.
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Link Aggregation Control Protocol (LACP)