Administrator Guide

Configuring the Minimum Number of
Links to be Up for Uplink LAGs to be
Active
You can activate the LAG bundle for uplink interfaces or ports (the uplink port-channel is LAG 128) on the I/O
Aggregator only when a minimum number of member interfaces of the LAG bundle is up. For example, based
on your network deployment, you may want 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 specified 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 specified number of interfaces. By default,
the uplink LAG 128 interface is activated when at least one member interface is up.
To configure 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 Configuration 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 configured LAG or
port channel settings. The
Minimum number of links to bring Port-channel up is field in the output of this
command displays the configured 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
Link Aggregation 536