Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Trunk Configuration
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CLI References
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“Link Aggregation Commands” on page 289
Command Usage
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To avoid creating a loop in the network, be sure you enable LACP before connecting the ports,
and also disconnect the ports before disabling LACP.
•
If the target switch has also enabled LACP on the connected ports, the trunk will be activated
automatically.
•
A trunk formed with another switch using LACP will automatically be assigned the next
available trunk ID.
•
If more than eight ports attached to the same target switch have LACP enabled, the additional
ports will be placed in standby mode, and will only be enabled if one of the active links fails.
•
All ports on both ends of an LACP trunk must be configured for full duplex, and
auto-negotiation.
•
Ports are only allowed to join the same Link Aggregation Group (LAG) if (1) the LACP port
system priority matches, (2) the LACP port admin key matches, and (3) the LAG admin key
matches (if configured). However, if the LAG admin key is set, then the port admin key must be
set to the same value for a port to be allowed to join that group.
NOTE
If the LACP admin key is not set when a channel group is formed (i.e., it has a null value of 0), the
operational value of this key is set to the same value as the port admin key used by the interfaces
that joined the group (see the
internal
Parameters
These parameters are displayed:
Configure Aggregator
•
Admin Key – LACP administration key is used to identify a specific link aggregation group (LAG)
during local LACP setup on the switch. (Range: 0-65535)
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Timeout Mode – The timeout to wait for the next LACP data unit (LACPDU):
•
Long Timeout – Specifies a slow timeout of 90 seconds. (This is the default setting.)
•
Short Timeout – Specifies a fast timeout of 3 seconds.
The timeout is set in the LACP timeout bit of the Actor State field in transmitted LACPDUs.
When the partner switch receives an LACPDU set with a short timeout from the actor switch,
the partner adjusts the transmit LACPDU interval to 1 second. When it receives an LACPDU set
with a long timeout from the actor, it adjusts the transmit LACPDU interval to 30 seconds.
If the actor does not receive an LACPDU from its partner before the configured timeout expires,
the partner port information will be deleted from the LACP group.
When a dynamic port-channel member leaves a port-channel, the default timeout value will be
restored on that port.
When a dynamic port-channel is torn down, the configured timeout value will be retained.
When the dynamic port-channel is constructed again, that timeout value will be used.