•
Configure a LACP EtherChannel with up to 16 Ethernet ports of the same type. Up to eight ports can
be active, and up to eight ports can be in standby mode.
•
Configure all ports in an EtherChannel to operate at the same speeds and duplex modes.
•
Enable all ports in an EtherChannel. A port in an EtherChannel that is disabled by using the shutdown
interface configuration command is treated as a link failure, and its traffic is transferred to one of the
remaining ports in the EtherChannel.
•
When a group is first created, all ports follow the parameters set for the first port to be added to the
group. If you change the configuration of one of these parameters, you must also make the changes to
all ports in the group:
◦
Allowed-VLAN list
◦
Spanning-tree path cost for each VLAN
◦
Spanning-tree port priority for each VLAN
◦
Spanning-tree Port Fast setting
•
Do not configure a port to be a member of more than one EtherChannel group.
•
Do not configure an EtherChannel in both the PAgP and LACP modes. EtherChannel groups running
PAgP and LACP can coexist on the same switch or on different switches in the stack. Individual
EtherChannel groups can run either PAgP or LACP, but they cannot interoperate.
•
Do not configure a secure port as part of an EtherChannel or the reverse.
•
Do not configure a port that is an active or a not-yet-active member of an EtherChannel as an IEEE 802.1x
port. If you try to enable IEEE 802.1x on an EtherChannel port, an error message appears, and IEEE
802.1x is not enabled.
•
If EtherChannels are configured on switch interfaces, remove the EtherChannel configuration from the
interfaces before globally enabling IEEE 802.1x on a switch by using the dot1x system-auth-control
global configuration command.
•
For cross-stack EtherChannel configurations, ensure that all ports targeted for the EtherChannel are
either configured for LACP or are manually configured to be in the channel group using the
channel-group channel-group-number mode on interface configuration command. The PAgP protocol
is not supported on cross- stack EtherChannels.
•
If cross-stack EtherChannel is configured and the switch stack partitions, loops and forwarding issues
can occur.
Related Topics
Configuring Layer 2 EtherChannels, on page 123
EtherChannel Overview, on page 106
EtherChannel Modes, on page 107
EtherChannel on Switches, on page 108
EtherChannel Link Failover, on page 109
LACP Modes, on page 114
PAgP Modes , on page 111
Silent Mode, on page 112
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29424-01 121
Configuring EtherChannels
EtherChannel Configuration Guidelines
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