Users Guide

Preserving LAG and Port Channel Settings in Nonvolatile Storage
Use the write memory command on an I/O Aggregator, which operates in either standalone or PMUX modes, to save the LAG
port channel conguration parameters. This behavior enables the port channels to be brought up because the congured interface
attributes are available in the system database during the booting of the device. With the reduction in time for the port channels to
become active after the switch is booted, the loss in the number of packets that are serviced by these interfaces is minimized.
Enabling the LACP link fallback member
By default, the lacp link-fallback member-independent port-channel 128 command is enabled on the
Standalone mode. This command is not available in the VLT mode. To disable the LACP link fallback member, use the no
lacp link-fallback member-independent port-channel 128 command.
The following log message appears when LACP link fallback is enabled:
Feb 26 15:53:32: %STKUNIT0-M:CP IFMGR-5-NO_LACP_PDU_RECEIVED_FROM_PEER: Connectivity to
PEER is restricted because LACP PDU's are not received. Verify the LACP configurations on
PEER to bring up the Uplink LAG to attain better bandwidth
The following log message appears when LACP link fallback is removed:
Feb 26 15:53:32: %STKUNIT0-M:CP %SMUX-5-SMUX_LACP_PDU_RECEIVED_FROM_PEER: LACP PDU received
from PEER and connectivity to PEER will be restored to Uplink Port-channel 128.
Enabling the Verication of Member Links Utilization in a LAG Bundle
To examine the working eciency of the LAG bundle interfaces, perform the following steps:
1. The functionality to detect the working eciency of the LAG bundle interfaces is automatically activated on all the port
channels, except the port channel that is congured as a VLT interconnect link, during the booting of the switch.
2. Use the show link-bundle-distribution port-channel interface-number command to display the trac
handling and utilization of the member interfaces of the port channel. The following sample output is displayed when you enter
this show command.
EXEC
Dell#show link-bundle-distribution port-channel
Dell#show link-bundle-distribution port-channel 1
Link-bundle trigger threshold - 60
LAG bundle - 1 Utilization[In Percent] - 0 Alarm State - Inactive
Interface Line Protocol Utilization[In Percent]
Te 0/5 Up 0
Te 0/7 Up 0
Monitoring the Member Links of a LAG Bundle
You can examine and view the operating eciency and the trac-handling capacity of member interfaces of a LAG or port channel
bundle. This method of analyzing and tracking the number of packets processed by the member interfaces helps you manage and
distribute the packets that are handled by the LAG bundle. The functionality to detect the working eciency of the LAG bundle
interfaces is automatically activated on all the port channels, except the port channel that is congured as a VLT interconnect link,
during the booting of the switch. This functionality is supported on I/O Aggregators in PMUX, Standalone, and VLT modes. By
default, this capability is enabled on all of the port channels set up on the switch.
You can use the show link-bundle-distribution port-channel interface-number command to display the
trac-handling and utilization of the member interfaces of the port channel. The following table describes the output elds of this
show command.
128
Link Aggregation