38 Rockwell Automation Publication 1783-UM003G-EN-P - December 2012
Chapter 2 Switch Software Features
Figure 6 - EtherChannels between Stratix 8000 Switches
You can configure an EtherChannel in one of these modes: Port Aggregation
Protocol (PAgP), Link Aggregation Control Protocol (LACP), or On. Configure
both ends of the EtherChannel in the same mode.
• When you configure one end of an EtherChannel in either PAgP or LACP
mode, the system negotiates with the other end of the channel to
determine which ports should become active. Incompatible ports are
suspended. Instead of a suspended state, the local port is put into an
independent state and continues to carry data traffic as would any other
single link. The port configuration does not change, but the port does not
participate in the EtherChannel.
• When you configure an EtherChannel in the On mode, no negotiations
take place. The switch forces all compatible ports to become active in the
EtherChannel. The other end of the channel (on the other switch) must
also be configured in the On mode; otherwise, packet loss can occur.
If a link within an EtherChannel fails, traffic previously carried over that failed
link moves to the remaining links within the EtherChannel. If traps are enabled
on the switch, a trap is sent for a failure that identifies the switch, the
EtherChannel, and the failed link. Inbound broadcast and multicast packets on
one link in an EtherChannel are blocked from returning on any other link of the
EtherChannel.
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