Cisco Catalyst 2960 Series, Configuration Manual

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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
Configuring EtherChannel Load-Balancing
Load-Balancing and Forwarding Methods, on page 333
MAC Address Forwarding, on page 333
IP Address Forwarding, on page 334
Load-Balancing Advantages, on page 334
Configuring the PAgP Learn Method and Priority , on page 348
PAgP Learn Method and Priority, on page 330
Configuring the LACP System Priority , on page 350
Configuring the LACP Port Priority , on page 351
EtherChannel Configuration Guidelines
If improperly configured, some EtherChannel ports are automatically disabled to avoid network loops and
other problems. Follow these guidelines to avoid configuration problems:
• Do not try to configure more than 24 EtherChannels on the switch or switch stack.
• In a mixed switch stack that contains one or more Catalyst 2960-S switches, do not configure more than
six EtherChannels on the switch stack.
• Configure a PAgP EtherChannel with up to eight Ethernet ports of the same type.
• 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.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Information About EtherChannels