Administrator Guide

Output 00.00 Mbits/sec, 0 packets/sec, 0.00% of line-rate
Time since last interface status change: 05:22:28
Optimizing Traffic Disruption Over LAG Interfaces On IOA
Switches in VLT Mode
When you use the write memory command while an Aggregator operates in VLT mode, the VLT LAG
configurations are saved in nonvolatile storage (NVS).
By restoring the settings saved in NVS, the VLT ports come up quicker on the primary VLT node and
traffic disruption is reduced. The delay in restoring the VLT LAG parameters is reduced (90 seconds by
default) on the secondary VLT peer node before it becomes operational. This makes sure that the
configuration settings of the primary VLT node are synchronized with the secondary VLT peer node
before the secondary VLT mode is up. The traffic outage is less than 200 millisconds during the restart or
switchover of the VLT peer nodes from primary to secondary.
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 stacking
modes, to save the LAG port channel configuration parameters. This behavior enables the port channels
to be brought up because the configured 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 Verification of Member Links Utilization in a
LAG Bundle
To examine the working efficiency of the LAG bundle interfaces, perform the following steps:
1. The functionality to detect the working efficiency of the LAG bundle interfaces is automatically
activated on all the port channels, except the port channel that is configured 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 traffic 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 0/13 Up 0
Link Aggregation
131