Users Guide

the uplink LAG bundle to be activated only if a certain number of member interface links is also in the up state. If you enable this
setting, the uplink LAG bundle is brought up only when the specied minimum number of links are up and the LAG bundle is moved
to the down state when the number of active links in the LAG becomes less than the specied number of interfaces. By default, the
uplink LAG 128 interface is activated when at least one member interface is up.
To congure the minimum number of member links that must be up for a LAG bundle to be fully up, perform the following steps:
Specify the minimum number of member interfaces of the uplink LAG 128 bundle that must be up for the LAG bundle to be
brought up. The default minimum number of member links that must be active for the uplink LAG to be active is 1. Enter the
minimum-links number command in the Port Channel Interface 128 Conguration mode to specify this value.
Dell(conf)#interface port-channel 128
Dell(conf-if-po-128)#minimum-links 4
Use the show interfaces port-channel command to view information regarding the congured LAG or port channel
settings. The Minimum number of links to bring Port-channel up is eld in the output of this command displays the congured
number of active links for the LAG to be enabled.
Dell#show interfaces port-channel 128
Port-channel 128 is up, line protocol is down(minimum links not up)
Created by LACP protocol
Hardware address is 00:01:02:03:04:05, Current address is 00:01:02:03:04:05
Interface index is 1107492992
Minimum number of links to bring Port-channel up is 4
Internet address is not set
Mode of IPv4 Address Assignment : NONE
DHCP Client-ID :000102030405
MTU 12000 bytes, IP MTU 11982 bytes
LineSpeed auto
Members in this channel:
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 05:22:24
Queueing strategy: fifo
Input Statistics:
0 packets, 0 bytes
0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
0 Multicasts, 0 Broadcasts
0 runts, 0 giants, 0 throttles
0 CRC, 0 overrun, 0 discarded
Output Statistics:
0 packets, 0 bytes, 0 underruns
0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
0 Multicasts, 0 Broadcasts, 0 Unicasts
0 throttles, 0 discarded, 0 collisions, 0 wreddrops
Rate info (interval 299 seconds):
Input 00.00 Mbits/sec, 0 packets/sec, 0.00% of line-rate
Output 00.00 Mbits/sec, 0 packets/sec, 0.00% of line-rate
Time since last interface status change: 05:22:28
Optimizing Trac 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 congurations 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 trac 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 conguration settings of the primary VLT node are synchronized with the secondary
VLT peer node before the secondary VLT mode is up. The trac outage is less than 200 millisconds during the restart or switchover
of the VLT peer nodes from primary to secondary.
Link Aggregation
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