Configuring The Pagp Learn Method And Priority - Cisco Catalyst 2975 Software Configuration Manual

Configuring EtherChannels
Beginning in privileged EXEC mode, follow these steps to configure EtherChannel load balancing. This
procedure is optional.
Command
Step 1 configure terminal
Step 2
port-channel load-balance {dst-ip | dst-mac |
src-dst-ip | src-dst-mac | src-ip | src-mac}
Step 3 end
Step 4
show etherchannel load-balance
Step 5 copy running-config startup-config
To return EtherChannel load balancing to the default configuration, use the no port-channel
load-balance global configuration command.

Configuring the PAgP Learn Method and Priority

Network devices are classified as PAgP physical learners or aggregate-port learners. A device is a
physical learner if it learns addresses by physical ports and directs transmissions based on that
knowledge. A device is an aggregate-port learner if it learns addresses by aggregate (logical) ports. The
learn method must be configured the same at both ends of the link.
When a device and its partner are both aggregate-port learners, they learn the address on the logical
port-channel. The device 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.
PAgP cannot automatically detect when the partner device is a physical learner and when the local
device is an aggregate-port learner. Therefore, you must manually set the learning method on the local
device to learn addresses by physical ports. You also must set the load-distribution method to
source-based distribution, so that any given source MAC address is always sent on the same physical
port.
Catalyst 2975 Switch Software Configuration Guide
37-16
Chapter 37 Configuring EtherChannels and Link-State Tracking
Purpose
Enter global configuration mode.
Configure an EtherChannel load-balancing method.
The default is src-mac.
Select one of these load-distribution methods:
dst-ip—Load distribution is based on the destination-host IP
•
address.
• dst-mac—Load distribution is based on the destination-host
MAC address of the incoming packet.
• src-dst-ip—Load distribution is based on the
source-and-destination host-IP address.
src-dst-mac—Load distribution is based on the
•
source-and-destination host-MAC address.
src-ip—Load distribution is based on the source-host IP
•
address.
src-mac—Load distribution is based on the source-MAC
•
address of the incoming packet.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
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