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Chapter 33
Configuring EtherChannels and Layer 2 Trunk Failover
Beginning in privileged EXEC mode, follow these steps to configure your switch as a PAgP
physical-port learner and to adjust the priority so that the same port in the bundle is selected for sending
packets. This procedure is optional.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
pagp learn-method physical-port
Step 4
pagp port-priority priority
Step 5
end
Step 6
show running-config
or
show pagp channel-group-number internal
Step 7
copy running-config startup-config
To return the priority to its default setting, use the no pagp port-priority interface configuration
command. To return the learning method to its default setting, use the no pagp learn-method interface
configuration command.
Configuring LACP Hot-Standby Ports
When enabled, LACP tries to configure the maximum number of LACP-compatible ports in a channel,
up to a maximum of 16 ports. Only eight LACP links can be active at one time. The software places any
additional links in a hot-standby mode. If one of the active links becomes inactive, a link that is in the
hot-standby mode becomes active in its place.
OL-8915-03
Purpose
Enter global configuration mode.
Specify the port for transmission, and enter interface
configuration mode.
Select the PAgP learning method.
By default, aggregation-port learning is selected, which means
the switch sends packets to the source by using any of the ports
in the EtherChannel. With aggregate-port learning, it is not
important on which physical port the packet arrives.
Select physical-port to connect with another switch that is a
physical learner. Make sure to configure the port-channel
load-balance global configuration command to src-mac as
described in the
"Configuring EtherChannel Load Balancing"
section on page
33-15.
The learning method must be configured the same at both ends
of the link.
Assign a priority so that the selected port is chosen for packet
transmission.
For priority, the range is 0 to 255. The default is 128. The higher
the priority, the more likely that the port will be used for PAgP
transmission.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring EtherChannels
33-17
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