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FTOS Configuration Guide for the C-Series - Force10 Networks

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Setting <strong>the</strong> LACP long timeout<br />

PDUs are exchanged between port channel (LAG) interfaces to maintain LACP sessions. PDUs are<br />

transmitted at ei<strong>the</strong>r a slow or fast transmission rate, depending upon <strong>the</strong> LACP timeout value. The timeout<br />

value is <strong>the</strong> amount of time that a LAG interface waits <strong>for</strong> a PDU from <strong>the</strong> remote system be<strong>for</strong>e bringing<br />

<strong>the</strong> LACP session down. The default timeout value is 1 second; it can be configured to be 30 seconds.<br />

Invoking <strong>the</strong> longer timeout might prevent <strong>the</strong> LAG from flapping if <strong>the</strong> remote system is up but<br />

temporarily unable to transmit PDUs due to a system interruption.<br />

Note: The 30-second timeout is available <strong>for</strong> dynamic LAG interfaces only. The lacp long-timeout<br />

command can be entered <strong>for</strong> static LAGs, but it has no effect.<br />

To configure <strong>the</strong> LACP long timeout (Figure 121):<br />

Step Task Command Syntax Command Mode<br />

1 Set <strong>the</strong> LACP timeout value to 30 seconds. lacp long-timeout CONFIG-INT-PO<br />

Figure 121 Invoking <strong>the</strong> LACP Long Timeout<br />

<strong>Force10</strong>(conf)# interface port-channel 32<br />

<strong>Force10</strong>(conf-if-po-32)#no shutdown<br />

<strong>Force10</strong>(conf-if-po-32)#switchport<br />

<strong>Force10</strong>(conf-if-po-32)#lacp long-timeout<br />

<strong>Force10</strong>(conf-if-po-32)#end<br />

<strong>Force10</strong># show lacp 32<br />

Port-channel 32 admin up, oper up, mode lacp<br />

Actor System ID: Priority 32768, Address 0001.e800.a12b<br />

Partner System ID: Priority 32768, Address 0001.e801.45a5<br />

Actor Admin Key 1, Oper Key 1, Partner Oper Key 1<br />

LACP LAG 1 is an aggregatable link<br />

A - Active LACP, B - Passive LACP, C - Short Timeout, D - Long Timeout<br />

E - Aggregatable Link, F - Individual Link, G - IN_SYNC, H - OUT_OF_SYNC<br />

I - Collection enabled, J - Collection disabled, K - Distribution enabled L - Distribution disabled,<br />

M - Partner Defaulted, N - Partner Non-defaulted, O - Receiver is in expired state,<br />

P - Receiver is not in expired state<br />

Port Gi 10/6 is enabled, LACP is enabled and mode is lacp<br />

Actor Admin: State ADEHJLMP Key 1 Priority 128<br />

Note: View PDU exchanges and <strong>the</strong> timeout value using <strong>the</strong> command debug lacp. See Monitoring and<br />

Debugging LACP on page 213.<br />

Monitoring and Debugging LACP<br />

The system log (syslog) records faulty LACP actions. See System Log Management on page 65 in<br />

Chapter 3, Management.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 213

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