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Rockwell Automation Publication 1783-UM007I-EN-P - December 2017 143
Configure Switch Features Chapter 3
Figure 18 shows two EtherChannels. Two full-duplex 10/100/1000-Mbps
ports on Switches A and C create an EtherChannel with a bandwidth of up to
4 Gbps between both switches. Similarly, two full-duplex 10/100 ports on
Switches B and D create an EtherChannel with a bandwidth of up to
400 Mbps between both switches.
If one of the ports in the EtherChannel becomes unavailable, traffic is sent
through the remaining ports within the EtherChannel.
Figure 18 - EtherChannel Example
Table 53 describes the modes you can assign to an EtherChannel:
Servers
Switch A
Switch B
Switch C Switch D
PC
MAC
Guest
Network
Management
Access
Point
Router with
Firewall
WAN/Internet
Printer
Printer
Table 53 - EtherChannel Modes
Mode Description
Static All ports join the EtherChannel, without negotiations. This mode can be useful if the remote device does not support the
protocols that other modes require. The switches at both ends of the link must be configured in Static mode.
Port Aggregation Control Protocol (PAgP) A Cisco-proprietary protocol. The port responds to requests to create EtherChannels but does not initiate such
negotiations. This silent mode is recommended when a port is connected to a device, such as a file server or a packet
analyzer that is unlikely to send PAgP packets. A port in the PAgP mode can form an EtherChannel with another port in
the PAgP Desirable mode.
Port Aggregation Control Protocol (PAgP) (non-silent) This mode is the same as PAgP mode but is recommended when the port is connected to a device that is expected to be
active in initiating EtherChannels. A port in PAgP mode can form an EtherChannel with another port in the PAgP
Desirable mode.
Port Aggregation Control Protocol (PAgP) Desirable This mode enables PAgP. The port initiates negotiations to form EtherChannels by sending PAgP packets to other ports.
This silent mode is recommended when a port is connected to a device, such as a file server or a packet analyzer that is
unlikely to send PAgP packets. A port in the Desirable mode can form an EtherChannel with another port that is in PAgP
or PAgP Desirable mode.
Port Aggregation Control Protocol (PAgP) Desirable
(non-silent) This mode is the same as PAgP Desirable mode but is recommended when the port is connected to a device that initiates
EtherChannels.
Link Aggregation Control Protocol (LACP) (active) This mode enables LACP unconditionally. The port sends LACP packets to other ports to initiate negotiations to create
EtherChannels. A port in active LACP mode can form an EtherChannel with another port that is in active or passive LACP
mode. The ports must be configured for full-duplex.
Link Aggregation Control Protocol (LACP) (passive) This mode enables LACP only if an LACP device is detected at the other end of the link. The port responds to requests to
create EtherChannels but does not initiate such negotiations. The ports must be configured for full-duplex.