Port Trunking

Port Status and Configuration

Table 12-5. LACP Port Status Data

Status Name

Meaning

Port Numb

Shows the physical port number for each port configured for LACP operation (C1, C2, C3 . . .). Unlisted

 

port numbers indicate that the missing ports are assigned to a static Trunk group, an FEC trunk group,

 

or are not configured for any trunking.

LACP Enabled

Active: The port automatically sends LACP protocol packets.

 

Passive: The port does not automatically send LACP protocol packets, and responds only if it receives

 

LACP protocol packets from the opposite device.

 

A link having either two active LACP ports or one active port and one passive port can perform dynamic

 

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 configured for passive LACP operation.

Trunk Group

TrkX: This port has been manually configured 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 active 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 configuration error such as differing port speeds on the same

 

link or attempting to connect the switch to more than the maximum number of supported trunks.

 

Standby: The port is configured for dynamic LACP trunking to another device, but the maximum number

 

of ports for the Dynamic trunk to that device has already been reached on either the switch itself 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 this case, LACP automatically assigns a Standby

 

port, if available, to replace the failed port.

LACP Partner

Yes: LACP is enabled on both ends of the link.

 

No: LACP is enabled on the switch, but either LACP is not enabled or the link has not been detected on

 

the opposite device.

LACP Status

Success: LACP is enabled on the port, detects 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. This can be

 

caused, for example, by an intervening device on the link (such as a hub), a bad hardware connection,

 

or if the LACP operation on the opposite device does not comply with the IEEE 802.3ad standard.

 

 

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