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another device are also configured as LACP, the switch and the
other device will negotiate a trunk link between them. If an LACP
trunk consists of more than four ports, all other ports will be
placed in a standby mode. Should one link in the trunk fail, one of
the standby ports will automatically be activated to replace it.
Command Usage
Besides balancing the load across each port in the trunk, the other
ports provide redundancy by taking over the load if a port in the
trunk fails. However, before making any physical connections
between devices, use the Web interface or CLI to specify the trunk
on the devices at both ends. When using a port trunk, take note of
the following points:
• Finish configuring port trunks before you connect the
corresponding network cables between switches to avoid
creating a loop.
• You can create up to six trunks on the switch, with up to four
ports per trunk.
• The ports at both ends of a connection must be configured as
trunk ports.
• When configuring static trunks on switches of different types,
they must be compatible with the Cisco EtherChannel standard.
• The ports at both ends of a trunk must be configured in an
identical manner, including communication mode (i.e., speed,
duplex mode and flow control), VLAN assignments, and CoS
settings.
• All ports on both ends of an LACP trunk must be configured for
full duplex, either by forced mode or auto-negotiation.
b_mgmt.book Page 101 Tuesday, July 8, 2003 5:24 PM