Specifications

Switching 8-9
Software Release 2.7.3
C613-03098-00 REV A
All the ports in a trunk group must have the same VLAN configuration: they
must belong to the same VLANs and have the same tagging status. All ports in
a trunk group must be added to VLANs together, and can only be deleted from
a VLAN as a group. Similarly, if the tagged or untagged status of the ports is
changed, it must be changed for all ports in the trunk group at the same time.
The members of a trunk group can be specified when it is created, and ports
can be added to or removed from a trunk group by using the commands:
add switch trunk=trunk port=port-list
delete switch trunk=trunk port={port-list|all}
Ports in a trunk group are set to autonegotiate at the trunk speed at full duplex.
When a port is added to a trunk group, the speed setting for the group
overrides the speed setting previously configured for the port. When a port is
removed from a trunk group, the port returns to its previously configured
speed and duplex mode settings.
The speed of the trunk group can either be specified when it is created or set by
using the command:
set switch trunk=trunk [select={macsrc|macdest|macboth|ipsrc|
ipdest|ipboth}] [speed={10m|100m|1000m}]
To display information about trunks on the switch, use the command:
show switch trunk[=trunk]
To display the VLANs to which the ports in the trunk groups belong, use the
command:
show vlan[=all]
Link Aggregation Control Protocol (LACP)
The implementation of the Link Aggregation Control Protocol (LACP) follows
the IEEE Standard 802.3-2002, CSMA/CD access method and physical layer
specifications.
LACP operates where systems are connected over multiple communications
links. Once LACP has been initially configured and enabled, it automatically
creates trunk groups and assigns appropriate links to their membership. LACP
continues to monitor these groups and dynamically adds or removes links to
them as network changes occur.
LACP achieves this by determining the following:
■ which ports are under LACP control
■ whether each port is in LACP active or LACP passive mode
■ which system has the highest LACP priority
■ the LACP priority of ports
■ whether the periodic timeout is fast or slow
Aggregation criteria
For individual links to be formed into an aggregated group they must meet the
following criteria:
■ originate on the same device