Management and Configuration Guide K/KA/KB.15.15

LACP trunk status commands include:
Dynamic LACP trunkStatic LACP trunkTrunk display method
Included in listing.Included in listing.CLI show lacp command
Not included.Included in listing.CLI show trunk command
Not includedIncluded in listing.Port/Trunk Settings screen in menu
interface
Thus, to display a listing of dynamic LACP trunk ports, you must use the show lacp command.
In most cases, trunks configured for LACP on the switches operate as described in Table 11
(page 153).
Table 11 LACP trunk types
OperationLACP port trunk configuration
This option automatically establishes an 802.3ad-compliant trunk group, with LACP
for the port Type parameter and DynX for the port Group name, where X is an
Dynamic LACP
automatically assigned value from 1 to 144, depending on how many dynamic and
static trunks are currently on the switch. (The switch allows a maximum of 144 trunk
groups in any combination of static and dynamic trunks.)
NOTE: Dynamic LACP trunks operate only in the default VLAN (unless GVRP is
enabled and Forbid is used to prevent the trunked ports from joining the default
VLAN.) Thus, if an LACP dynamic port forms using ports that are not in the default
VLAN, the trunk automatically moves to the default VLAN unless GVRP operation is
configured to prevent this from occurring. In some cases, this can create a traffic loop
in your network.
Under the following conditions, the switch automatically establishes a dynamic LACP
port trunk group and assigns a port Group name:
• The ports on both ends of each link have compatible mode settings (speed and
duplex.)
• The port on one end of each link must be configured for LACP Active and the port
on the other end of the same link must be configured for either LACP Passive or
LACP Active. For example:
Either of the above link configurations allows a dynamic LACP trunk link.
Backup Links: A maximum of eight operating links are allowed in the trunk, but, with
dynamic LACP, you can configure one or more additional (backup) links that the
switch automatically activates if a primary link fails. To configure a link as a standby
for an existing eight-port dynamic LACP trunk, ensure that the ports in the standby
link are configured as either active-to-active or active-to-passive between switches.
Displaying dynamic LACP trunk data: To list the configuration and status for a dynamic
LACP trunk, use the CLI show lacp command.
NOTE: The dynamic trunk is automatically created by the switch and is not listed
in the static trunk listings available in the menu interface or in the CLI show trunk
listing.
Provides a manually configured, static LACP trunk to accommodate these conditions:Static LACP
• The port on the other end of the trunk link is configured for a static LACP trunk.
• You want to configure non-default Spanning Tree or IGMP parameters on an LACP
trunk group.
Trunk group operation using LACP 153