Cisco Catalyst 2960 Series, Configuration Manual

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• 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.
Related Topics
Configuring Layer 2 EtherChannels , on page 342
EtherChannel Overview, on page 324
EtherChannel Modes, on page 325
EtherChannel on Switches, on page 326
EtherChannel Link Failover, on page 327
LACP Modes, on page 332
PAgP Modes , on page 329
Silent Mode, on page 330
Creating Port-Channel Logical Interfaces
Channel Groups and Port-Channel Interfaces, on page 327
PAgP Modes , on page 329
Silent Mode, on page 330
Configuring the Physical Interfaces
Channel Groups and Port-Channel Interfaces, on page 327
PAgP Modes , on page 329
Silent Mode, on page 330
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
339
Information About EtherChannels