11-27

Optimizing Port Usage Through Traffic Control and Port Trunking
Port Trunking
Ports: Traffic Control
and Trunking
Default Port Operation

In the default configuration, all ports are configured for passive LACP. How-

ever, if LACP is not configured, the port will not try to detect a trunk config-

uration and will operate as a standard, untrunked port. The following table

describes the elements of per-port LACP operation. To display this data for a

particular switch, execute the following command in the CLI:

HP4108> show lacp

Table 11-7. LACP Port Status Data

Status Name Meaning
Port Numb Shows the physical port number for each por t configured for LACP operation (C1, C2, C3 . . .). Unlis ted
port numbers indicate that the missing ports are assigned t o a static Trunk group, an FEC trunk group,
or are not configured for any trunking.
LACP Enabled Active: The port automa tically sends LACP protocol packets.
Passive: The port does not automaticall y send LACP protocol packets, and re sponds only if it receives
LACP protocol packets from the opposite device.
A link having either two active LACP ports or one act ive port and one passive port can perform dyna mic
LACP trunking. A link having two passive LACP ports will not perform LACP trunking because both ports
are waiting for an LACP protocol packet from the opposite device.
Note: In the default switch configuration, all ports are confi gured for passive LACP operation.
Trun k G rou p TrkX: This port has been manually configu red into a static LACP trunk.
Trunk Group Same as Port Number: The port is configured for LACP, but is not a member of a port trunk.
Port Status Up: The port has an activ e LACP link and is not blocked or in Standby mode.
Down: The port is enabled, but an LACP link is not established. This can indicate, for example, a port that
is not connected to the network or a speed mismatch between a pair of linked ports.
Disabled: The port cannot carry traffic.
Blocked: LACP, STP, or FEC has blocked the port. (The port is not in LACP Standby mode.) This may be
due to a trunk negotiation (very brief) or a conf iguration error such as differing port s peeds on the same
link or attempting to connect the Switch 4108GL to more than six trun ks.
Standby: The port is configured for dynamic LACP trunking to anot her device, but the maximum number
of ports for the Dynamic trunkto that device has alread y been reached on either the Switch 4108GL or
the other device. This port will remain in reserve, or “standby” unless LACP detects that another, active
link in the trunk has become disabled, blocked, or down. In t his case, LACP automatically assigns a
Standby port, if available, to replace the fa iled port.
LACP Partner Yes: LA CP is enabled on both ends of the link.
No: LACP is enabled on the Switch 4108GL, but either LACP is no t enabled or the link has not been
detected on the opposite device.
LACP Status Success: LACP is enabled on the port, detect s and synchronizes with a device on the other end of the
link, and can move traffic across the link.
Failure: LACP is enabled on a port and detects a device on the other end of the link, but is not able to
synchronize with this device, and therefore not able to send LACP packets across the link. Th is can be
caused, for example, by an intervening devic e on the link (such as a hub), a bad har dware connection,
or if the LACP operation on the opposite device does not comply with the IEEE 802.3ad standard.